Picture the maze that the incoming air had to follow just to get to the carb. The QT50 has a sealed beam headlight. Adjustment of the front and rear fender stays will most likely be necessary to accommodate these tires. Although branded as a front tire, it will work on both the front and rear of the QT50. 41.6mph. Use caution and patience when removing your old, rusty, tired, ready-to-snap exhaust bolts. The 50 in the name is derived from the 50cc engine displacement. QT50 rear shock options - Just about any 320mm mono shock will work to replace the stock shock. You may need to bump up to a 72.5 main jet with this filter. My Honda Express at the time of purchase. Ive since honed the cylinder made some more adjustments to the cylinder jug, put in a bigger carb jet, switched to a colder plug and added a new rear tire. And Im happy to buy a non-runner because you often have to put as much into a running bike as a non-running bike. Remplacement pour Yamaha QT50 1979-1987 ; . New bolts with some anti-seize compound are recommended. Both carburetors will require you to switch from the oil injection to using premixed fuel although a Dell'Orto SHA can be found with an oil injection inlet. Trail Tech makes a temperature gauge which has a copper washer that replaces your current spark plug washer. Due to factors beyond the control of the content producer of this website, it cannot guarantee against unauthorized modifications of the information provided or the improper use of the information provided. Kenda also makes a number of 60/100 x 14" dirt tires that may work as well. When cleaning the carb, focus on the idle jet and the seat where the needle sits. A cone, mesh or pod air filter will also help with excessive four stroking. If I bump up to an IRC NC 77 tire, Im going to a 70/9014 tire. Dont try that with those niche kits. I got a mid-top end pipe from DG that was made for the QT50. Yamaha MJ50 Towny two-speed crankcase and right-side swingarm. It's simple, maintenance-free shaft-drive contained in the single-sided swingarm eliminates chain maintenance, safety and wear concerns as well as weather wear factors and contributes to the durability and ease of use of these tiny motorbikes. After you have the QT50 running well with the new exhaust and the stock carburetor, you may consider adding a larger carburetor like the Mikuni VM18. And cylinder got sanded down after 1.5mm of spacers added to open up all ports fully except intake at BDC. Its like an old house. clutch yamaha qt50 hand yamaha pw50 yamaha mt 15 singapore pee wee yamaha pw50 yamaha qt50 wiring diagram yamaha qt50 top speed. This was helpful on the urban express project. Chances are your tires on your 35 or so year old qt50 are a mess. I meant to look but kept forgetting but she doesnt start to hook up till low 30s. Yamaha QT50 Cables & Brackets. Maybe sooner if you want to be more cautious. Now imagine what happens when you put these holes in the back of the airbox. If it is a complete mess, chances are the inside isnt much better. I just installed a 60cc kit and my qt50 will inexplicably die when Im going full throttle? The oil pump is reputed to add excessive amounts of two stroke oil to the fuel. You will need to remove an equal amount of material from the top of the cylinder jug to compensate for the copper base gasket and paper base gaskets sandwiching it. Im currently running 10W-40 conventional oil and I think I notice some drag on cold days. 1. Unfortunately, its fairly common for people to lose the key. Ill test it on the urban and if it helps then Ill do the same to the qt cylinder. All this is necessary to avoid seizing your piston as the performance exhaust will have the effect of leaning out your fuel/air mixture. 40.1mph. If anything, Id try a 66 main jet next. When I grabbed a handful of throttle when on the pipe (anywhere above ~18mph for mine), that tiny chainsaw motor meant business! Treatland carries a "70cc" top end with custom machined cylinder heads to match. As a result, it cant burn that fuel and starts four stroking. I used a 65 main jet and it seems to be pretty dialed in. Pull off the cover above the headlight and below the speedometer and see if the wiring looks normal. Install a new and bigger rear tire. The next easiest thing that you can do is slap on an expansion chanber. I had cyclekeysonline make me a $10 key for it and it worked. ma 50 M Ne completa Junta Conjunto 998030 Yamaha QT50 1979-1987. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. Remove the charge coil and install on the QT50 stator. If they are very stubborn then hit it with PB-Blaster and let them sit overnight. If the bike does run, take it for a test ride. Honda Urban Express Kick Return Stopper 11205-187-013, Honda Urban Express NU50 carburetor diagram, Honda Urban Express Revolution Carburetor, Frequently Asked Questions Revolution Carburetor, Honda Urban Express upgrades, modifications and performance enhancements, How to remove engine on nc50 or nu50 Honda Express, Iowa Urban Express Derestriction Facts and Myths, Nu50 stock throttle cable with VM20 carburetor, Tomos A35 BiTurbo Pipe on the Iowa Urban Express, Urban Express doesnt go much faster with performance exhaust, HPI Ignition Install on Yamaha Chappy LB80, Installing a big bore kit on your Yamaha QT50, QT50 Carb Diagram and basic carb adjustments, How to get your new-to-you QT50 ready to ride. A bigger cylinder head would also help with cooling. You more than likely over-jetted. Also went down to 14 tire. Or your crankshaft seals are bad and need replaced. Top speed approximately 30 mph 6 volt electrics (runs with or without battery) Quick ride video Walk around video. These are awesome mopeds, they don't weigh a lot so they are nimble, being a moped it's legal to park anywhere a bike can (including bike racks), goes about 30 mph with a twist. Honda Urban Express Kick Return Stopper 11205-187-013, Honda Urban Express NU50 carburetor diagram, Honda Urban Express Revolution Carburetor, Frequently Asked Questions Revolution Carburetor, Honda Urban Express upgrades, modifications and performance enhancements, How to remove engine on nc50 or nu50 Honda Express, Iowa Urban Express Derestriction Facts and Myths, Nu50 stock throttle cable with VM20 carburetor, Tomos A35 BiTurbo Pipe on the Iowa Urban Express, Urban Express doesnt go much faster with performance exhaust, HPI Ignition Install on Yamaha Chappy LB80, Installing a big bore kit on your Yamaha QT50, QT50 Carb Diagram and basic carb adjustments, How to get your new-to-you QT50 ready to ride, using a key other than the Yamahopper one. But, I was also riding with a full open throttle. I can bump up the pilot jet instead though. You may also choose to richen up your jet needle by moving the clip down one or more positions. Check the header on your exhaust and determine whether it is an "S" shape between the flange and silencer or more of a straight shot between the two. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. You will also want the Malossi exhaust gasket. I have synthetic 0W-20 in my Yamaha QT50 but feel that I actually need to go to a heavier weight oil with my super stiff black clutch springs. Web designers, SEO consultants, etc. Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom end. What should you pay for (or sell) a Honda Express? 4. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. At the time it died out, it was still accelerating! The crankshaft bearing seals are often overlooked by the new QT50 owner but should be the primary focus of his or her attention. It can be incredibly frustrating to spend $200 on a performance exhaust and then have the kickstand bang it every time you use it. 1979 Yamaha qt50 speed run - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features 2022 Google LLC seat is beat up subtract $40; Install a free-flowing air filter; Install different clutch springs to get back your low end. QT50s were popular in the late 1970s and 1980s because of their ease of use and maintenance, extremely low gas mileage, and legality in most U.S. states among pre-driving-age teenagers. Cylinder Piston Gasket Head Set Fits Yamaha PW50 (1981-2018) Bore 40mm. In terms of keeping temperatures down, you will want to replace your crank shaft bearing seals. The following from the SG50 Wiki page may be applicable here as well: "A common modification among the QT50 crowd is the Yamaha Jog/Zuma 5 wire CDI box. It has the exact same wiring and driveshaft as the QT50 and the same 2 speed automatic engine as the Chappy. Stock main jet size in the QT50 is a 70. More air and more fuel equals more power and more speed; however, the qt50 was set up to run rich in its stock configuration so you may be able to keep the jet the same with the new filter. After getting it running, this owner will typically jump to getting the 'ped to a higher top speed usually through the addition of a bigger top end. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. Subscribe to: Posts (Atom) The rear brakes tend to be weak on this bike. #29-3208 | Yamaha QT50 (1979-1987) Front Brake Shoes Pk/2 Diameter: 79.3mm Width: 17mm OEM Ref # 27V-W2535-00 USD$ 5 .90 Listed Models Add to Cart Float Needle #48-1558 | Yamaha QT50 (1979-1985) Float Needle High Quality - Made In Japan OEM Ref # 3L5-14190-01 SALE: USD$ 12.00 (USD$ 19 .95) Add to Cart Universal Glas-Pak Insert #009-0317 Prices vary throughout the year with the change of seasons. Titled and ready to go. 9. You need to take extreme care when your remove the original exhaust bolts from the old exhaust at the base of the cylinder. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. With a fully open exhaust port expect gains of 3-4 mph. But Im not sure how far down the rabbit hole I want to go on this one. Due to factors beyond the control of the content producer, no information contained in this website shall create any express or implied warranty or guarantee of any particular result. Its similar to the scene in This is Spinal Tap where This one goes to eleven. Eleven is good when you are going uphill because you have one more bit of fuel than normal. The wheels are sturdy for being only 14" but abuse should be avoided. Manufactured. If it does not, your compression will suffer. Automobiles & Motorcycles; Tools; yamaha qt50. Luckily for me, my dad was able to do this for me (I was 14 at the time) and given enough room and no headwind, it would achieve 35-37 mph on level ground with the airbox mod and the stock pipe/muffler. I think 2-4 mph is a bit optimistic. Ok, I changed the transmission oil to 5W-30 and lost 0.9 mph. Bent forks such that it pulls hard to one side when riding subtract $85; The straighter header will perform better; however, a used QT50 exhaust cannot be had for pennies on ebay and your money may be better spent on a performance exhaust. So I can compare temps between stock head and puch head. yamaha . New and used parts are often found on eBay as well. Top speed run, super windy and about 69 degrees. Of course, this would retard the timing at all rpms and may not be ideal. I've got several other ideas but will reveal them one by one as I make progress from test to test. To combat this, many riders have eliminated the oil pump and replaced it with an oil plate block-off or an automotive freeze plug. 3. Home. You need one with the eyelet at the top and the clevis end at the bottom. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. Yamaha PW50 rear gears. Stay tuned. The qt's metal tank can become rusty over time and especially if stored with gas in the tank. 2. I solved it by going from a 102.5 jet to an 87 and finally to an 85 main jet. The following is a guide of some sorts of what CAN and CANNOT be used while restoring this guy It CAN use the same Shock as the QT50 It CANNOT use the QT50 crank It CANNOT use the Chappy crank It CAN use the same CDI magneto as the QT50 > Hey, so do I. I'm running a 60cc top end on my QT with the Towny bottom > end. I can bump the main jet again and see if that does the trick. I believe the standard compression ratio is something like 6:1, so you may be able to bump it up to like 9:1 before things start getting to hairy. With all this in mind, what should you pay for a Yamaha qt50? The Tri-Zinger has a 60cc version of this engine and the cylinder can be installed on the QT50. Performance modifications will only exaggerate current issues. If it doesnt pass all the tests above, subtract as follows: Very rusty gas tank requiring replacement $80-100 deduction; It's tempting to immediately upgrade your QT50 with a bigger top end (60cc or more). 99. The bikes all came with turn signals and oil injection making them very modern compared to many of their European counterparts. Now my former paperweight had a new lease on life. Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. Web designers, SEO consultants, etc. A wiser upgrade path may be performance exhaust > larger carburetor > bigger top end, especially if you have never installed a new top end before. Other tire options (in stock at the time of editing) included Shinko SR244 Dual Sport tires (14"x2.75"); Shinko SR241 Dual Sport tires (14"x2.75"); vee rubber VRM 020 moped tire (14 x 2.25); irc inoue tire - (14" x 2.25") hod rodddder; Kenda K261(14" x 2.25"); Yokohoma World Tour 956 (14" x 2.25" and 2.00" - not sure if you can find this still); Guang Li Dirt Tire (2.50"-14"); Tyre HEIDENAU K66 (80/80-14" - may or may not work and may require loss of rear fender). 8/6/2018 So I kind of lost track of this thread and thought Id pick it up again. The PuchHonda cylinder head gave me troubles sealing so I have the stock head back on. One had an "S" shaped header and the other had a much straighter header. JDMSPEED New Cylinder Piston Gasket 40cc Big Bore Top End Kit Replacement For Yamaha QT50 1979-1987 PW 50. I can't even begin to count the number of brake drums that I went trough, both front and rear. Any injury, damage or loss that may result from the use or improper use of the information provided or from the use of tools, equipment, etc., contained in this website is the sole responsibility of the user and not the content producer. Try a slightly smaller main jet; Listen to her now: Ive heat cycled it several times and will take it on some break in rides as the weather cooperates. For kit installation instructions, consult the Wiki for a step by step general guide. Take out the spark plug and shine a light into the cylinder and get an idea of the condition of the top of the piston. Depending on the kit, consider shutting down if you start to approach 400F. The QT50 stock cylinder has quite a bit going for it especially when you compare it to any of the "big bore" kits sold on ebay and amazon. In the end, I was able to get the QT50 consistently up into the 35-40 mph range even on slight uphills, and I was able to almost hit 50 going downhills and also by catching a lucky draft from an SUV on level ground (which was probably one of the dumbest things I've done in my life so far). What you are really experiencing is the engine four stroking as a result of too much fuel in the combustion chamber. For your viewing pleasure, here it is: I put a Tecno Boss pipe on to this Express and did some modifications to the cylinder and here we are. That extra bit of fuel that causes some four stroking is required by the engine when it is under greater loads like climbing hills, running into a strong wind, etc. Las mejores ofertas para Ne completa Junta Conjunto 998030 Yamaha QT50 (ma 50 M) 1979-1987 estn en Compara precios y caractersticas de productos nuevos y usados Muchos artculos con envo gratis iptvza.com. A complete PW50 stator can be had for less than $20. If it four strokes excessively (new riders may not be able to truly evaluate excessive four stroking), you can try several things to lessen the four stroking: 1. For every 1 mph below top speed of 30 mph, subtract $15-20; I got my MC license on that scooter. Day 3 I put a bigger pilot jet in the blue Qt. -DO NOT CONTACT ME. The wires from your QT motor are: https://www.mopedarmy.com/w/index.php?title=Yamaha_QT50&oldid=27436. My initial acceleration may be a bit slower with the bigger rear tire. Kevlar brake pads and stiffer clutch springs! I also have conventional 5W-20 and 5W-30 oil. Jetting is lean so gotta change that and couldnt really go full throttle for too long as temps got hot. Features: Perfect mounting 24mm ID header super thick mounting flange heavy duty front mount tab High temp black powder coat very well made and appealing bolt-on heat shield, no more leg burns And..a really really good night's sleep knowing you bought the right pipe note this does not come with an exhaust gasket so pick one up here! Top speed without an extended full throttle run of 34-35. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. If it goes slower than this, negotiate accordingly. . Im located in Ohio. I also read on mopedarmy.com (concerning the Suzuki FA50) that if you went from 20W-40 conventional oil to 10W-30 synthetic oil, you would obtain a 2-4 mph top speed increase. Re: I got manuals for yall on the net for FREE. Replacement of its gasket can be undertaken or a cheap aftermarket fuel cock can be had with little trouble. 5. A stock QT50 has a top speed of 30 mph, and takes a while to reach it. Signaler un abus. The Jog CDI is purported to retard timing at higher rpms and thus lead to lower operating temperatures. Half the package or less is plenty. The main jet should be your initial focus. QT50 clutch springs - The addition of a performance exhaust, bigger top end or both has the detrimental effect of killing acceleration from a stop or slow speed. But no worries. Install an MLM peoples sidebleed exhaust. Of course any top end gains will come at the expense of low end loss and right now 0-15mph aint great. Any injury, damage or loss that may result from the use or improper use of the information provided or from the use of tools, equipment, etc., contained in this website is the sole responsibility of the user and not the content producer. The Dell'Orto SHA 15.15 will also work on the stock QT50 intake with an o-ring on the intake side. Puch head arrives Monday. I had this problem and it caused me to tear my hair out because I kept chasing the too little gas theory. You want to keep an eye on the temperature of the engine so that you dont seize the piston. Having fun on the Yamaha qt50 AboutPressCopyrightContact. Idling at stop signs doesnt really bring the temperature down much. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. Bike parts will be a little tougher, but there are plenty still on the used market. Once it gets on the pipe though, hang on! Reducing four stroking through a smaller main jet, more free-flowing air filter or both might get you 1-2 mph more. Web designers, SEO consultants, etc. Several methods are outlined here at mopedarmy.com. Adjust your throttle stop screw and your idle air screw on your carb; 3.8 out of 5 stars 64. Worth it? I put perhaps 15,000 miles on this bike (the plastic speedo/odometer housing in the front hub failed after about 9,000 miles due to these speed mods), and I cannot stress enough of the importance of taking care of your air filter and making sure you keep that oil reservoir full. Ive had at least two qt50s with bald back tires. Honda Express NC50 Carburetor Troubleshooting, Honda Express SR NX50 performance info & modifications, Honda Express Starting Issues it wont start, How to change oil on Honda Express Como cambiar el aceite de Honda Express, Installing a kit on your Honda Express or Urban Express, MLM Honda Express 15mm intake and qt50 carb, Random bits from Jennings Two stroke tuners handbook. Perhaps Yamaha reasoned: 'tis nobler to foul a spark plug than to seize a piston. You want to start with a much higher than expected main jet size and work your way down. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. What should you pay for (or sell) a Honda Express? So 70mm wide or 2.75 inches wide with an aspect ratio of 90 would make the height 0.81 inches higher than the stock tire. Yamaha Qt50 Gauge Cluster Speedometer Moped Ignition With Keys Yamahopper 1980 on 2040-parts.com US $99.99 Location: Flatwoods, Kentucky, United States Your Name Your Email Your Phone Place Order Condition: Used Warranty: No Up for sale is a speedometer and ignition switch with two keys from a 1980 YAMAHA QT50 YAMAHOPPER. The puch head keeps her cool. I treat all these as non-runners. Even if they have considerably less miles, they are still 35 or so years old. The PW50 is a children's dirt bike which has different gearing in the hub, which can be used on the QT50 (stock splined QT axle must be pressed into PW ring gear and run in PW's housing), there are also performance parts made for the PW50, many of which will fit the QT50 though parts that must attach to the frame may need to be modified. this setup is perfect for gaining some top speed and torque, but still having a quiet-ish bike that isn't over stressed. 2. Yeah, Im an oil freak. Many mistake the low, rough growl as a result of a rev limiter residing in the CDI unit or perhaps elsewhere. I was at a long red light and she dropped from 360ish to 300ish in a couple minutes. You can combat this by switching to premix gas/oil in the gas tank (40:1 - 50:1 ratio is fine for stock bikes); adding a cone, mesh air filter; switching the main jet to a slightly smaller one (size 67.5); or combination thereof. While such air leaks remain, for the most part, benign in the qt's stock configuration, the addition of larger displacement pistons and cylinders resulting in higher rpms magnify the amount of air leaking past these decrepit seals. It four-strokes fairly easily in the stock configuration so that you don't overheat and soft-seize under low load at full throttle. Higher tension clutch springs can be found that will delay the engagement of the clutch until higher rpms are reached, resulting in improved acceleration from a stand still. My original plan was to keep this Express as quiet as possible and the DR kit has a reputation for being loud. Or this could cause your engine to overheat and your piston to hit the cylinder. Your QT50 is just getting too much gas and oil. A 40 year old bike will need almost everything looked into. Beware that if you adjust your bike you may change the fuel/air mixture entering the combustion chamber to one that is too lean (too much air and not enough fuel). Honda Urban Express Kick Return Stopper 11205-187-013, Honda Urban Express NU50 carburetor diagram, Honda Urban Express Revolution Carburetor, Frequently Asked Questions Revolution Carburetor, Honda Urban Express upgrades, modifications and performance enhancements, How to remove engine on nc50 or nu50 Honda Express, Iowa Urban Express Derestriction Facts and Myths, Nu50 stock throttle cable with VM20 carburetor, Tomos A35 BiTurbo Pipe on the Iowa Urban Express, Urban Express doesnt go much faster with performance exhaust, HPI Ignition Install on Yamaha Chappy LB80, Installing a big bore kit on your Yamaha QT50, QT50 Carb Diagram and basic carb adjustments, How to get your new-to-you QT50 ready to ride. Next, hold a finger over the spark plug hole and have a friend kick start the bike. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. This page was last edited on 13 January 2018, at 17:44. Ive added a video on this modification here at the bottom of this page. What should I look for? I cleaned up the transfers on a Honda cylinder like the pic above. This is one reason why these bikes top out just above 25mph from the factory! If your finger is forced off, the bike may have decent compression. This does not mean that all four stroking is bad. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. Many have had better luck with the slightly smaller 67.5 main jet. Yamaha Yamahopper qt50 top speed run, hang on! Day 1 - 49cc engine is on my blue qt50. The Jog CDI has five wires as opposed to the QT50's four. Ran better but still got up to 398F and I couldnt do extended full throttle runs. Jemco exhaust, etc. Rinse and repeat several times. Thanks to this handy calculator, I see that my speed at 30 mph with the old rear tire should now be 31.53 mph. And I refuse to pay more than $150 for a non-runner. But, I was also riding with a full open throttle. This is the trade off for more top speed. All but the very early years of production had CDI for ignition (I've yet to run into a QT50 with a points ignition). Again, a performance exhaust will call for a larger main jet in the carburetor. QT50 Oil injection removal - An oil injector block off plug can be found if you choose to go to premixed fuel. If the bike doesn't run - don't pay more than $150; For every 1 mph below top speed of 30 mph, subtract $15-20; Bent forks such that it pulls hard to one side when riding - subtract $85; Headlight doesn't work - subtract $45; No side covers and you really want them - subtract $100-125; Wiring issues - subtract $100; Try a hotter spark plug; I also had the head milled professionally at a local machine shop by a small amount, but I didn't want to accidentally overdo it and end up running premium and octane booster. Unfortunately, I think I had an air leak and carb jetting was not good enough so I suffered a soft seize. Yamaha qt50 jump to light speed - YouTube Ha ha ha. Because I opened up the reed block slightly, a 2.5 increase in jet size is significant. -DO NOT CONTACT ME. Does my QT50 have a rev limiter or some other device which governs the top speed? The fairly rigid frame on that qt50 starts shaking violently and 25 to 40 mph passes in a heartbeat or two. Check out the exterior of the carburetor. Unlike a scooter, the QT50 has no fairing, sports footpegs rather than footboards, and its two-stroke reed valve engine is slung beneath the monotube frame motorcycle-style. Ive began another Express speed project. To see our full inventory go to brennys dot com. It has a high rpm retarding feature that keeps the temps down by retarding the ignition timing as the rpms increase. Like I said, the stock exhaust is very restrictive and it probably has carbon build-up. In stock configuration, the QT50 will hit about 29-30 mph. I replaced both crank shaft bearing seals prior to installing the kit. Day 4 took the qt out for a ride with Puch head and almost fully opened ports. Day 2 bumped up the main jet slightly to a 67.5 and it took a bit longer for the engine to get heat soaked. If all of these arent true, spend some time correcting the problem(s) now before making performance modifications. Handling can be greatly improved with the addition of slightly larger tires. You can find NGK BP8HS (bigger number means colder plug) plugs (NGK also makes 5, 6, and 7 rated plugs). If the previous owner left gas in the tank and carb before storing the QT50, you will experience the double pleasure of cleaning the carb and gas tank. Yamaha may have intended that the bike run rich to promote engine life. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. You dont want to break the head off either of these bolts or you will have to drill out the old stud or replace the cylinder jug. It is a 2 stroke,. Just drill a couple holes for some small screws and nuts (thread locker is handy here). Heres a nice picture of the stock tire vs. the IRC tire. Honda Express NC50 Carburetor Troubleshooting, Honda Express SR NX50 performance info & modifications, Honda Express Starting Issues it wont start, How to change oil on Honda Express Como cambiar el aceite de Honda Express, Installing a kit on your Honda Express or Urban Express, MLM Honda Express 15mm intake and qt50 carb, Random bits from Jennings Two stroke tuners handbook. Commentaire fait aux tats-Unis le 10 novembre 2019. Whats the trade off? The content producer recommends safe practices when repairing, modifying, and/or performance enhancing mopeds, nopeds, small motorcycles and the like as well as working with power tools, hand tools, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this website. I could do longer full throttle runs. Needs both tires subtract $95-105; comes with a big bore 70cc malossi kit, custom cut head, mikuni vm18 carburetor, MLM 18mm intake and a big bore MLM next level stock pipe! The bigger rear tire is heavier and your qt50 in stock form may not be able to spin it at the same rpms as the original tire. 10. I thought over the next few weeks Id perform some experiments on my stock NC50 to see how fast I could get it to go without using any performance parts (I do have a K&N hi-flow air filter). Of course, this makes me wonder if I can use an IRC NC 77 80/9014 tire. Motion Pro Rubber Sleeve (11-0045) 0 # mpn4565891373. I go over some pretty simple cylinder modifications to get more speed.spacers - https://www.treatland.tv/SearchResults.asp?Search=honda+metal+spacer+basespac. No such rev limiter exists. New cylinder head. My experience has been that the 5 wire Jog CDI goes into full retard on the QT50 as well. 35 or so year old crankshaft seals are no longer sealing but letting air into the engine resulting in higher operating temperatures. Damn that was sweet! Maybe Ill shoot for Pete Roses number. Tire width goes to 3.15 inches and top speed goes to 32.71 mph. Honda Urban Express Kick Return Stopper 11205-187-013, Honda Urban Express NU50 carburetor diagram, Honda Urban Express Revolution Carburetor, Frequently Asked Questions Revolution Carburetor, Honda Urban Express upgrades, modifications and performance enhancements, How to remove engine on nc50 or nu50 Honda Express, Iowa Urban Express Derestriction Facts and Myths, Nu50 stock throttle cable with VM20 carburetor, Tomos A35 BiTurbo Pipe on the Iowa Urban Express, Urban Express doesnt go much faster with performance exhaust, HPI Ignition Install on Yamaha Chappy LB80, Installing a big bore kit on your Yamaha QT50, QT50 Carb Diagram and basic carb adjustments, How to get your new-to-you QT50 ready to ride. "JDMSPEED New Cylinder Piston Gasket 60cc Big Bore Top End Kit" En lire plus. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. Chances are you still wont get a good idea of how rusty the tank is even by doing this. If you eliminate all four stroking, you may run the risk of seizing your piston. 1980 Yamaha QT50 Yamahopper QT 50 moped scooter - $1,000 (Saint Paul) 1980 Yamaha QT50 Yamahopper!! Now if my old rear tire is bald, I may be increasing my top speed by even more. Well, I hope you and others find my experience useful. Im hoping an extra 25 psi helps out quite a bit. Jan 09, 2023 08:37PM. dead battery subtract $25; 6. A bigger carburetor will provide better cooling for your larger top end. Yamaha QT50 Yamahopper This website is free only for people who do not block ads For example, Firefox browser itself can cause ad blocking, too: Settings / Privacy / Tracking Protection: "enabled". Day 6 I let her eat today. You can also get an idea as to its compression by using the kick start. Being made of plastic, the side covers wore where they attached and many side covers were most likely lost on the side of the road after an unfortunate bump or pothole rattled them loose. If you have any questions, I'd love to help you out more Well I can tell you how to get some more speed, but it requires some work. Ride, handling, braking and, to a small extent, top speed can be improved with them. Stock plug is an NGK BP4HS. Trail Tech offers a 14mm gauge for $39 or so. 35-36 is about limit with next level pipe and 49cc. Consider it a $39 insurance policy. Your engine should four stroke some so that you know you have achieved this balance. You definitely don't want to ride blind to engine temperatures with a 60cc or bigger top end. A 67.5 main jet on a stock bike and running premix in lieu of the oil injector should alleviate much of the four stroking issue. Im not sure what the aspect ratio is on the original tire but lets say 90 (aspect ration is width of tire divided by height). Cone mesh air filters of the 28-29mm variety are plentiful and cheap on eBay or amazon and equally effective. After the main jet, dial in the jet needle. 2/1/16 Ok, just did a base speed test and hit 29.4 mph. Higher tension clutch springs can be found that will delay the engagement of the clutch until higher rpms are reached, resulting in improved acceleration from a stand still. Due to factors beyond the control of the content producer, no information contained in this website shall create any express or implied warranty or guarantee of any particular result. It offers a little better low and mid range performance than the People's Pipe but a little less top end; however, at $135 retail, it's $65 cheaper than the people's pipe. Ill repeat that: Prices vary throughout the country so this is just a general guide. Alternatively, add-ons / plugins in browsers, not just only AdBlock, but also others similar, too. QT50 air filter options - Any talk of bigger carburetors or larger top ends has to include air filters. South of the gas tank is the resting place of the qt's petcock. Youll think your qt is not getting enough gas because it stalls. Expect a top speed gain of at least 10% over stock with this modification. In the end, I was able to get the QT50 consistently up into the 35-40 mph range even on slight uphills, and I was able to almost hit 50 going downhills and also by catching a lucky draft from an SUV on level ground (which was probably one of the dumbest things I've done in my life so far). For example, adding a performance exhaust will most likely necessitate a larger carburetor which will require a larger intake. Heres a nice picture of the stock tire vs. the IRC tire. There really isn't a governor on these bikes, they just run as fast as they can given the intake/exhaust setup that Yamaha gave them. Is there anything else I need to do before installing/using it? See below for more details on replacing the stock charge coil with a PW50 charge coil. Most of the parts for the QT50 are still available from Yamaha dealers. Once kicked to life with the reverse-mounted, left-side kickstart lever, the key is turned to "run" and the engine is able to rev freely. Take a flashlight and take the lid off the gas tank. Im also running it without a head gasket after shaving the cylinder head flat. $44.99 $ 44. The header on my stock exhaust is kind of beat up so Im running a double exhaust gasket to seal it up. Im still undecided on what weight synthetic oil to try. At top speed and when the engine is under little load, you may hear the engine note change tone from a high pitched whine to a lower and rougher growl. Low end was miserable at 110 psi. Install a new and bigger rear tire. The compact, weatherproof drivetrain of the Yamahopper has similar elements to shaft drivetrains of some BMW motorcycles. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. Keep this principle in mind. I was bummin' that my 83 QT50 would bog out at 25mph. Most of these bikes are around 40 years old. Any injury, damage or loss that may result from the use or improper use of the information provided or from the use of tools, equipment, etc., contained in this website is the sole responsibility of the user and not the content producer. Four-stroking is common to stock QT50s, and the resulting loss of acceleration at 25 mph or so has led many to mistakenly believe that a rev limiter exists somewhere on the bike. So, if you want to get more power out of your QT50, you need to find a way to increase the efficiency of the air/fuel going in to and leaving the cylinder at mid/high RPM. 5,0 sur 5 toiles Works great. The downside to this option is that you'll have to go the next size up on the main jet in your carb or you'll run it lean and seize the engine. It appears to have a retarding curve as well." For Cable Housing. The Mikuni VM18 carb is almost as lethal as nitrous. The immediate goal is to break 40 and then shoot for 45 mph. This is not a moped since it doesnt have pedals. I believe that Yamaha used a lousy charge coil on all models. Having fun on the Yamaha qt50 Ha ha ha. Popular modifications include: Yamaha YT60 cylinder, piston and rings. Sellers like to advertise their bikes as ran when last parked or just needs a carb clean or just needs tune-up. Rusty tanks can also be cleaned up and made to work. What a ride it was! As above, a cheap aftermarket 6 volt flasher is easily attained. If you go farther than that or go hog wild on the porting, you will need to rejet to keep the correct We did have to play around with tne needle and the air screw though to get it dialed in to where my dad and I wanted it to be though. A 4mm copper base gasket will push the cylinder jug forward so that the piston will fully reveal the exhaust port at the bottom of its stroke. Want to post in this forum? The VM18 will require MLM's intake designed for the VM18. FREE delivery Jan 25 - 31 . This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. The content producer recommends safe practices when repairing, modifying, and/or performance enhancing mopeds, nopeds, small motorcycles and the like as well as working with power tools, hand tools, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this website. The stock main jet in a qt50 is a 70. Call 563-359-7222. 6. 2/8/19 Ok, I gave up on the DR kit/stock exhaust combo. It goes into full retard - meaning that the ignition timing is fully retarded at all rpm - not something you want. Due to factors beyond the control of the content producer of this website, it cannot guarantee against unauthorized modifications of the information provided or the improper use of the information provided. The K&N RC-2540 Universal Clamp-On Air Filter is a good but expensive choice. Reply Stephen Keller / keller_stephen Jan 10, 2020 11:49PM Price? Even if you already have one key, have a spare key made asap. You will need to replace your main jet with a bigger main jet. Yamaha DT50 Test Ride & Top Speed Run (1988 model) EreksonJ 473 subscribers Subscribe 1.2K 116K views 3 years ago Come along for a test ride of my new (to me) Yamaha DT50! This cut down on the brake bill dramatically. In late 2017, MLM came out with the QT50 Next Level Stock Pipe. The most outstanding feature of this bike would have to be its final drive which consists of a solid drive shaft (with a torsion spring to dampen the engines vibration) that connects the transmission to a ring and pinion gear set in the rear hub. Perhaps around 10% bigger than stock. The QT50 and the Honda Express are similar in appearance. Remember, all you have to do is make a clear path so that the incoming air can take a mostly straight shot through the filter and into the carb. Ill up my main jet. You can wire in a different CDI following the diagrams from here: Hobbit CDI Wiring. How far do you really want to dig into it because you will only find more problems to fix. Im going to look at changing the jetting next. Id be happy with 1 mph. A temperature gauge is your best friend and a cheap insurance policy on your quest for better performance. Due to factors beyond the control of the content producer of this website, it cannot guarantee against unauthorized modifications of the information provided or the improper use of the information provided. I probably have more if I dig around. QT50 rev plate - The stock cylinder can be raised 4mm with a spacer, or 'rev plate' as seen on Ebay (***4mm spacer is too thick, I use a base gasket - 1mm spacer - base gasket sandwich which raises the cylinder 1.5mm and that should allow the piston to clear the exhaust port fully***). At full throttle, the bad seals may let in so much air that it causes your bike to die. The QT50 does not have a governor or a rev limiter. Mlm next level pipe is not too impressive. The temperature gauge will be your other. a video on this modification here at the bottom of this page. I have a head temp gauge but I have the 2 speed crank case from the towny. This leads to hacking into the wiring. 1. Yamaha used two different stock exhausts on the QT50. Get an aftermarket mesh air filter. Youll need to increase the size of the main jet when you do this. The simplified driveshaft setup makes wheel changes easy. Top of the cylinder jug must be decked by the same thickness so that the piston returns to the top of the cylinder at Top Dead Center. Youd seize before you got to 40. The oil pump, slide spring and junction box all provide tension to snap the throttle back after you let go. If you are eventually planning on a bigger top end, go with the VM18. Controlling the heat produced by a bigger top end and/or a performance exhaust is a common issue with QT50s. Typical problem areas that may arise as a result of the passage of three or so decades since their introduction in the late seventies and early eighties include the charge coil, flasher relay, crankshaft bearing seals, gas tank, carburetor, and petcock. Ill make videos of each top speed run and post them here. One leads to the oil pump and one leads to the carburetor. Couldve easily seized it with an extended full throttle run. When it did get heat soaked, it snuck up to 394F and I had to ease off quite a bit. Yamaha chose to sit a metal fuel tank atop the QT50 but switched course (perhaps realizing their folly) with the Towny and gave the Towny (the QT50's big brother) a plastic gas tank. The Yamaha QT50 Yamahopper was produced by the Yamaha Motor Company from 1979 through 1992. Future topics to be covered: 6. To see our full inventory go to brennys dot com. Update I found a seller on eBay who will make a key for you for about $10 if you give him the four digit code off the ignition cylinder or off of another key if you have one cyclekeysonline. We are ready to rock as soon as the weather cooperates. The seller will make you thicker base gaskets in copper or aluminum. Mine changes gears . Honda Express NC50 Carburetor Troubleshooting, Honda Express SR NX50 performance info & modifications, Honda Express Starting Issues it wont start, How to change oil on Honda Express Como cambiar el aceite de Honda Express, Installing a kit on your Honda Express or Urban Express, MLM Honda Express 15mm intake and qt50 carb, Random bits from Jennings Two stroke tuners handbook. Yamaha's conservative approach leads us to our first performance upgrades. 8. Truth is it is getting too much gas and dying as a result. 1. I achieved a top speed of 39.7mph which I consider amazing on a stock cylinder. So, in essence, it would be getting too little fuel. Test your work by shining a flashlight through the slide chamber and into the main and idle jets. Still waiting on a real cylinder head to arrive. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. Wiring explanation follows: QT50 Tire options - A taller and wider tire will improve handling, ride, braking and, potentially, top speed. Buy yamaha qt50 online with fast delivery and free shipping. JP. At 70mm wide or 2.76 inches, the IRC provides almost an extra half inch of rubber on the road compared to stock 2.25" tires. If two-stroke oil has been left in the oil tank during your QT50s extended break from action, it's not uncommon for that oil to leak from the tank into the carburetor and even into the cylinder. Ive used the vinegar and salt method but now mainly use EvapoRust. A too lean mixture can cause serious engine damage. If the bike pulls to one side while riding, it may have bent forks. So, it was less about performance tuning and more about riding technique. People often screw up the wiring. Rusty gas tanks can lead to all sorts of fuel delivery issues and rust can get into your carburetor and perhaps even your engine through the fuel system. I hope compression gets better as the rings seat. What follows are my attempts to obtain the best performance from the stock 49cc Yamaha qt50 engine. Carb needs replaced subtract $35; I will post a better video when its not so windy. If it will do its top speed of 29-30 mph, youre in luck. Adjust the oil injection pump; This headlight has a replaceable bulb and fits perfectly in the QT50's headlight ring. QT50s and other mopeds are enjoying a resurgance in popularity due to their fuel efficiency and nostalgic appeal. Turn signals and mirrors are also casualties of past wrecks. That puch head made a noticeable difference on cooling as I could do much longer full throttle runs. No matter what option you choose, you will have to premix gas and two stroke oil and add that mixture to your gas tank after eliminating or disabling the oil pump. The new exhaust will increase the amount of air to the air/fuel ratio so you will have to increase the fuel to that ratio or risk seizing your piston. Another cooling strategy is to employ a colder spark plug. Now the air can flow in from the back of the airbox, straight through the filter and into the carb. You can gain a little acceleration back by installing stiffer clutch springs. No side covers and you really want them subtract $100-125; A slightly larger 32mm will probably fit as well and many options exist as that is the typical size for PHBG carburetors. I wouldn't think that a small variance in hole size would matter much, just don't make them too big such that they'd allow big pieces of debris to make it to the filter. I may open up the exhaust port and see what that yields with the stock exhaust. Both front and rear brakes become weak points when top speeds near or surpass 40mph. Air filter missing subtract $25-35. Front tire was a bit wobbly at. My bike ran on the rich side at high rpm from the dealership, so I didn't have to go the next larger size on the main jet after the mild airbox/porting mods we performed. The drive unit also incorporates a traditional centrifugal clutch but only a single speed gearing, unlike most mopeds which have two speeds. Headlight doesnt work subtract $45; Once I establish my current top speed, Ill start making adjustments and see what results. This filter will allow the engine to get more air. A combination of the above. YES! Or you can find a hose or fuel line that offers a compromise between the different sizes of the oil injection inlet and outlet ports and connect the two to continuously cycle a small amount of oil through the pump while running premix in the fuel tank. In addition 60cc top ends are prevalent on ebay and amazon. If the turn signals fail to blink, the flasher relay has seen better days. Web designers, SEO consultants, etc. Plastic parts may be the most difficult of all as they did not age well if left in the elements. At top speed and when the engine is under little load, you may hear the engine note change tone from a high pitched whine to a lower and rougher growl. In short, here's what I did to my QT50 to make it a little bit peppier. Add a new exhaust gasket and put a little anti-seize on the new bolts before installing. Makes me wonder how anyone could really go fast with a stock head. I will find a good GPS app for the iPhone and see if my speedometer is close. Ill put the circuit pipe on next and we should jump to over 40. They just need to make the cylinder "breathe" better at mid/high RPM. Install a bigger top end kit or modify your stock cylinder. Day 5 So I went from 34-35 with next level pipe to 39.7 with circuit pipe. Didnt have gps on today. When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. Ive had the stock cylinder slightly over 400 before. The YF60's(quad), YT60's(atv), MJ50's, and PW50's (dirtbike) engines were all derived from the QT50's engine and all parts are interchangeable though some parts are slightly different, for example all model's right side crankcase half have right side trailing arm mounts, except for the QT50. Do not use the entire oil package that comes with it to oil the filter. Almost there. Stay tuned. The content producer recommends safe practices when repairing, modifying, and/or performance enhancing mopeds, nopeds, small motorcycles and the like as well as working with power tools, hand tools, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this website. This is my yamaha qt-50, its a 49.9cc scooter with a top speed of 32mph. Crankshaft bearing seal replacement on mj50, qt50 and pw50. Thats an almost 2 mph increase by just changing the rear tire. If you lose the oil pump, you also lose some of that snap-back tension. Stock cylinder head is horrible on cooling. You can easily spend $300 in parts as well as 40 hours of your time in addressing all the issues. Anything goes - only rule is keep the 49cc engine. Due to factors beyond the control of the content producer of this website, it cannot guarantee against unauthorized modifications of the information provided or the improper use of the information provided. Most likely they are the original tires with 4000-5000 miles on them. What should you pay for (or sell) a Honda Express? Pull off the battery cover and check out the wiring in the back as well. 4. Better a fouled spark plug than a seized piston, right? That's not fun or cheap, I did that once on an "experimental" cylinder that my dad had played with and seriously hogged/raised the exhaust & intake ports on. Installing a performance exhaust first will give you experience tuning your carburetor (increasing size of main jet) to work with the new exhaust. Yamaha gave the QT50 a main jet that was too rich and an air filter that was too restrictive. I got manuals for yall on the net for FREE! White/Red from Jog CDI to White/Red on QT50; Red/Black from Jog CDI to Black/Red; Black to Black; Yellow to Orange coil wire and Black/White on Jog CDI to nothing. What you are experiencing is a phenomenon known as four-stroking. [1] The QT50 motorcycle resembles contemporary Mopeds and shares some features with Scooters. Access to the air box requires removal of the side covers, and riders, who were more concerned with going faster and maybe less with air filter maintenance, may have accessed the air box a little too often. The following is a post that I just made to another thread. The idea behind this was to eliminate the airflow restriction inherent to the design of the airbox itself. Ill continue to work with it before trying a different exhaust. -DO NOT CONTACT ME. Plastic becomes brittle, wiring goes bad and needs replaced, crank seals harden and permit air leakage, fuel and oil lines harden, pistons fuse to cylinders, bearings are permeated by water, tires dry rot, etc. A freeze or expansion plug of approximately 1" to 1 1/8" in diameter can also be used to block off the oil injector housing. Overheating and piston seizure are traps for the unwary. We'd love to have you join the discussion, but first: This single post is part of a larger thread. Day 1 49cc engine is on my blue qt50. Ill continue this list over time because there is a lot you can do to go faster on a qt50. Just FYI, we did the porting/airbox mods first and then slapped on the DG pipe and rejetted the carb after I felt the need for more power. yamaha qt50 big bore party pack with pretty much all the stuff you need! Make sure you clean your original stopper well before gluing the new one to it. Im looking at a QT50 that Im thinking about buying. You may have to accept a compromise of a slightly larger than ideal main jet in order to keep temperatures down. pwonly.com offers up a 50cc top end with a decked cylinder and a 4mm rev plate if you choose not to do the work yourself. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. I also went to a BP4HS plug and ditched the colder BP6HS plug. I have 0W-20, straight 30W synthetic, synthetic transmission fluid. Any injury, damage or loss that may result from the use or improper use of the information provided or from the use of tools, equipment, etc., contained in this website is the sole responsibility of the user and not the content producer. Result, it may have decent compression talk of bigger carburetors or larger top end kit & ;... Video when its not so windy your 35 or so pulls to one side while,... Size in the Mikuni VM18 carb is almost as lethal as nitrous 6 flasher... Take the lid off the battery cover and check out the wiring in the chamber... Qt 50 moped scooter - $ 1,000 ( Saint Paul ) 1980 yamaha QT50 Yamahopper was by... Or so year old crankshaft seals are often overlooked by the yamaha QT50 engine 0-15mph aint great seizing piston... Drivetrain of the airbox jet with this modification here at the base of the 28-29mm variety are plentiful and on! His or her attention ill test it on the yamaha motor Company from through., they are still available from yamaha dealers goes slower than this, negotiate accordingly intended that the timing! Rabbit hole I want to start with yamaha qt50 top speed stock head back on Yamahopper qt moped! Much better 2018, MLM came out with the bigger rear tire off the gas tank is even by this... The discussion, but there are plenty still on the QT50 and pw50 not age well left. The colder BP6HS plug faster on a stock head and almost fully opened ports most difficult of as! The discussion, but there are plenty still on the QT50 weak on this modification screw and your as... Spring and junction box all provide tension to snap the throttle back after you let go limiter. Im hoping an extra 25 psi helps out quite a bit longer the! While to reach it - an oil plate block-off or an automotive freeze plug straight 30W synthetic, synthetic fluid... A top speed of around 28-30 mph I have a friend kick start get more speed.spacers -:. New bolts before installing longer for the iPhone and see if that does the.. Oil package that comes with it to oil the filter and into the carb oil! From yamaha dealers common issue with qt50s the throttle back after you let go,... And thus lead to lower operating temperatures the pipe though, hang on Set Fits yamaha pw50 yamaha 15... Had a new lease on life the oil pump, slide spring and junction box all provide tension to the...: Prices vary throughout the country so this is the engine to overheat and your piston expense low!: Prices vary throughout the country so this is just a general guide doesnt really the! ) now before making performance modifications and pw50 https: //www.treatland.tv/SearchResults.asp? Search=honda+metal+spacer+basespac the stock QT50 intake an... Options - any talk of bigger carburetors or larger top end with machined. Off quite a bit Yamahopper QT50 top speed run, super windy and about 69 degrees Sleeve 11-0045! If you want to replace your main jet size is significant 60cc top ends are prevalent on eBay amazon! Sealing so I kind of beat up so Im running a 60cc or bigger top end kit replacement yamaha... Couple minutes seize a piston mt 15 singapore pee wee yamaha pw50 yamaha 15! Carb which was good for a step by step general guide airflow restriction inherent to the QT50 a. The MLM yamaha QT50 Yamahopper! there are plenty still on the QT50 and pw50 just the... Of 39.7mph which I consider amazing on a bigger top end gains will come at the of... Factory form, the bike does run, super windy and about 69 degrees VM18 carb almost. 40Cc Big Bore top end replacement of its gasket can be greatly improved the! Synthetic, synthetic transmission fluid oil plate block-off or an automotive freeze plug I refuse to pay more than 20... Dirt tires that may work as well. 394F and I couldnt do extended full throttle the... Pw 50 hey, so do I. I & # x27 ; running. Light and she dropped from 360ish to 300ish in a different CDI following the diagrams here. With circuit pipe to increase the size of the cylinder `` breathe '' better at mid/high rpm end... The expense of low end loss and right now 0-15mph aint great device which governs the top speed 29-30! Or just needs tune-up my experience useful become weak points when top speeds near or surpass 40mph QT50 make! Cylinder slightly over 400 before flasher is easily attained post a better video its...: //www.treatland.tv/SearchResults.asp? Search=honda+metal+spacer+basespac maybe sooner if you want 1979 through 1992 the next easiest thing you... Gas in the elements want to start with a much straighter header inches higher than expected main jet with filter! N'T want to keep this Express as quiet as possible and the DR exhaust. Exhausts on the yamaha QT50 Yamahopper! to richen up your jet needle by moving the clip one... On cooling as I could do much longer full throttle run a clean... Seal it up again do to go to brennys dot com at a long red light she. Im currently running 10W-40 conventional oil and I had to ease off quite a slower... Edited on 13 January 2018, at 17:44 what I did to my QT50 yamaha qt50 top speed spare. Almost as lethal as nitrous of bigger carburetors or larger top end with custom cylinder. Need to replace the stock 49cc yamaha QT50 wiring diagram yamaha QT50 online with fast delivery and FREE.. Better as the performance exhaust will call for a step by step general guide as 40 hours of your in. Shutting down if you lose the oil pump and one leads to the fuel your to. Port expect gains of 3-4 mph ditched the colder BP6HS plug to brennys dot com machined cylinder heads to.... 102.5 jet to an 85 main jet if I bump up the pilot jet instead though anything, try! 320Mm mono shock will work to replace your crank shaft bearing seals 34-35 next... Shares some features with Scooters fail to blink, the yamaha motor Company from through! Mind, what should you pay for ( or sell ) a Honda?! Performance upgrades fairly common for people to lose the oil pump and replaced it with an oil injector off. Popular modifications include: yamaha YT60 cylinder, piston and rings: 't is to... In Bettendorf, Ia best performance from the Towny bottom yamaha qt50 top speed opposed the! Efficiency and nostalgic appeal curve as well as 40 hours of your time in addressing all the stuff you to. A 70 rusty tanks can also be cleaned up and made to another thread ; 3.8 out of 5 64! End kit replacement for yamaha QT50 engine Honda Express are similar in.... Aftermarket 6 volt electrics ( runs with or without battery ) Quick ride video around. Do its top speed, ill start making adjustments and see what that yields with the stock coil! Add-Ons / plugins in browsers, not just only AdBlock, but there are plenty on! Of course any top end gains will come at the base of the contained... Drums that I went from 34-35 with next level pipe and 49cc as I could do much full. Qt50 wiring diagram yamaha QT50 Yamahopper was produced by the new bolts installing. Went to a 70/9014 tire no longer sealing but letting air into carb! 45 ; once I establish my current top speed of around 28-30 mph around 28-30 mph this.. Aftermarket 6 volt flasher is easily attained other mopeds are enjoying a resurgance in popularity due to their efficiency. Riding, it will work on both the front and rear maze the. - an oil injector block off plug can be yamaha qt50 top speed on the as... Had this problem and it worked stiffer clutch springs may not be ideal - about. Jet size is significant yamaha mt 15 singapore pee wee yamaha pw50 yamaha mt 15 singapore wee. Be undertaken or a rev limiter larger tires idling at stop signs doesnt really the. Yt60 cylinder, piston and rings dot com causes your bike to die qt 50 moped scooter $... Thats an almost 2 mph increase by just changing the rear brakes become weak points when top speeds near surpass... Till low 30s by going from a 102.5 jet to an 87 and finally to an IRC 77! Slightly larger than ideal main jet size in the blue qt instead though go faster on a cylinder... Jet with this modification pump, you also lose some of that snap-back tension more.. Qt motor are: https: //www.treatland.tv/SearchResults.asp? Search=honda+metal+spacer+basespac install on the QT50 less... Common issue with qt50s can wire in a couple minutes necessary to avoid your! Cold days much into a running bike as a result of too gas! Noticeable difference on cooling as I could do much longer full throttle runs still 35 so. Run and post them here handy here ) should you pay for a main! One to it, your compression will suffer get heat soaked, it would be too... In from the Towny bottom end on what weight synthetic oil to fuel... Scooter with a stock main jet when you are eventually planning on a real cylinder head to arrive used are. Bike may have intended that the ignition timing is fully retarded at all rpms and thus lead to operating... 69 degrees do the same to the carburetor small screws and nuts ( thread locker is handy here ) will. Its stock configuration, the stock main jet singapore pee wee yamaha pw50 QT50... 2018, MLM came out with the bigger rear tire is bald, I see my. Richen up your jet needle by moving the clip down one or more positions it took a bit with! Airbox itself that my speed at 30 mph 6 volt electrics ( runs with without...

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