yamaha qt50 top speed

Headlight doesnt work subtract $45; It gets around 100-125 mpg, its really reliable, I use it to drive to campus, you can park it on the bike racks and. 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. $650 in Ohio may be the same as $900 in California or New York. ma 50 M Ne completa Junta Conjunto 998030 Yamaha QT50 1979-1987. 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. 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. Engine failure is imminent. 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. Perhaps around 10% bigger than stock. Use caution and patience when removing your old, rusty, tired, ready-to-snap exhaust bolts. A carb cleaning will be necessary. 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! What should I look for? When I turned 16 and I was able to get a truck, we were looking into getting stronger springs for the clutch so that it would engage at a higher RPM (so it would better negate the loss of low-end power), but we could never find any. Better a fouled spark plug than a seized piston, right? [1] The QT50 motorcycle resembles contemporary Mopeds and shares some features with Scooters. I had this problem and it caused me to tear my hair out because I kept chasing the too little gas theory. 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***). I think 2-4 mph is a bit optimistic. 278-27114-00) and super glue it to the original stopper so that you have two stacked together. I have 0W-20, straight 30W synthetic, synthetic transmission fluid. I can't believe that my county/town cops never approached me concerning its legality in my state given how much louder it was. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. If the bike doesnt run dont pay more than $150; So if my qt50 can spin the taller tire at the same revolutions per minute my speed should increase. Subscribe to: Posts (Atom) 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. It usually happens when you are going full throttle and down a slight decline or hill. No such rev limiter exists. What you are really experiencing is the engine four stroking as a result of too much fuel in the combustion chamber. I used the mlm intake adapter and a little gasket maker between the intake adapter and the intake to prevent any air leaks. Low end was miserable at 110 psi. Ill be interested to see the difference in head temps as compared to stock head. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. 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. Damn that was sweet! A 28 or 29mm air filter will fit on the stock Mikuni VM12 carburetor. For Cable Housing. 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). The Dell'Orto SHA 15.15 will also work on the stock QT50 intake with an o-ring on the intake side. Removing the oil injection gear will not result in any noticeable amount of overall speed or power. Having fun on the Yamaha qt50 AboutPressCopyrightContact. It has the exact same wiring and driveshaft as the QT50 and the same 2 speed automatic engine as the Chappy. -DO NOT CONTACT ME. New tires may be in store for you as well. 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. No side covers and you really want them subtract $100-125; 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. Of course, this would retard the timing at all rpms and may not be ideal. The QT50 does not have a governor or a rev limiter. The Jog CDI has five wires as opposed to the QT50's four. The puch head keeps her cool. These bikes like most Japanese bikes of the time came with excellent finishes in both the paint and chrome, though the plastic parts on many of these have deteriorated over the years. Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. When it did get heat soaked, it snuck up to 394F and I had to ease off quite a bit. YES! This page was last edited on 13 January 2018, at 17:44. 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. -DO NOT CONTACT ME. Replacement is not too difficult but does involve a few specialized tools (flywheel puller, flywheel holder or piston stop, torque wrench, soldering iron). Puch head arrives Monday. What you are experiencing is a phenomenon known as four-stroking. For kit installation instructions, consult the Wiki for a step by step general guide. You can gain a little acceleration back by installing stiffer clutch springs. Best jetting for VM18 on this setup seems to be 20 idle jet and 80 main jet. I probably have more if I dig around. What should you pay for (or sell) a Honda Express? This motorcycle, scooter or moped-related article is a stub. Installing a temperature gauge is always a great idea when you perform modifications like this. Other thoughts include installing an even bigger carburetor, installing a new top end, adding performance reeds, etc. Day 4 took the qt out for a ride with Puch head and almost fully opened ports. 1979 Yamaha qt50 speed run - YouTube AboutPressCopyrightContact usCreatorsAdvertiseDevelopersTermsPrivacyPolicy & SafetyHow YouTube worksTest new features 2022 Google LLC The other 2 wires are power for lights or battery. At full throttle, the bad seals may let in so much air that it causes your bike to die. This is not a moped since it doesnt have pedals. Ron Peek / yamahauler. 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 engine being slightly under 50cc, it was legal in some states to operate this diminutive motorcycle without a drivers licence thereby making the QT50 appealing to teanagers. What Ive found in owning 7 Yamahoppers and 3 Townys to date (2018) as well as other bikes is that age is more detrimental than mileage. 10. It can be incredibly frustrating to spend $200 on a performance exhaust and then have the kickstand bang it every time you use it. 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. Most likely they are the original tires with 4000-5000 miles on them. Theres a lot more flow now. Still waiting on a real cylinder head to arrive. Yamaha qt50 jump to light speed - YouTube Ha ha ha. Alternatively, add-ons / plugins in browsers, not just only AdBlock, but also others similar, too. Maybe sooner if you want to be more cautious. You can help Wikipedia by expanding it. Many QT50 owners initially cannot get past 25 mph or so because of the resultant four-stroking. Any of the above-mentioned modifications will also require a bigger main jet to compensate for the additional air that these top ends draw. Top speed approximately 30 mph 6 volt electrics (runs with or without battery) Quick ride video Walk around video. So, it was less about performance tuning and more about riding technique. The wheels are sturdy for being only 14" but abuse should be avoided. A complete PW50 stator can be had for less than $20. All but the very early years of production had CDI for ignition (I've yet to run into a QT50 with a points ignition). A temperature gauge is mission critical to keeping your piston from soft seizing. Yamaha PW50 rear gears. 8. If your bike was owned by a kid in the past, your back tire may even be bald. You need one with the eyelet at the top and the clevis end at the bottom. What a ride it was! When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. However, the 4 pin Jog/Zuma CDI box from a late 80's-early 90's vertical cylinder model works on the Sting, and is plug and play. Ok, I changed the transmission oil to 5W-30 and lost 0.9 mph. Treatland carries a "70cc" top end with custom machined cylinder heads to match. So you want your Honda Express to go faster. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. Mine changes gears . This headlight has a replaceable bulb and fits perfectly in the QT50's headlight ring. This posting echoes Fred's post to some extent, but I was lucky that my dad had porting experience. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. The QT50 and the Honda Express are similar in appearance. Heres a nice picture of the stock tire vs. the IRC tire. A bigger carburetor will provide better cooling for your larger top end. Pull off the cover above the headlight and below the speedometer and see if the wiring looks normal. Stock Configuration and Basic Performance Upgrades, https://www.mopedarmy.com/w/index.php?title=QT50_performance&oldid=24781. Chances are you still wont get a good idea of how rusty the tank is even by doing this. You need to take extreme care when your remove the original exhaust bolts from the old exhaust at the base of the cylinder. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. Jetting is lean so gotta change that and couldnt really go full throttle for too long as temps got hot. I imagine the rear fender would have to go with this tire and would the tire fit on the rim? FREE delivery Jan 25 - 31 . 4. Plastic parts may be the most difficult of all as they did not age well if left in the elements. Yamaha may have intended that the bike run rich to promote engine life. 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. Stay tuned. What should you pay for (or sell) a Honda Express? These are usually the first things that are misplaced. Add a 3-4mm copper/aluminum spacer to the base of the cylinder and deck the cylinder the same amount. In late 2017, MLM came out with the QT50 Next Level Stock Pipe. If I bump up to an IRC NC 77 tire, Im going to a 70/9014 tire. 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. Your qt50 should start up easy, run smooth and have a top speed around 30mph in its stock configuration. I ordered a puch 40mm head. Youll think your qt is not getting enough gas because it stalls. Caveat: if you use a metal spacer/rev plate to raise the cylinder and open up the exhaust port, your initial acceleration will be negatively affected. This leads to hacking into the wiring. I was bummin' that my 83 QT50 would bog out at 25mph. Kevlar brake pads and stiffer clutch springs! There is a four digit number on the ignition cylinder that matches the number on the key. Performance modifications will only exaggerate current issues. We'd love to have you join the discussion, but first: This single post is part of a larger thread. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. Manufactured. Although unlikely that any significant difference exists, the straighter version contributed more to performance than the "S" shaped version. The Yamaha QT50 Yamahopper is a moped produced by the Yamaha Motor Company from 1979 through 1987. After the main jet, dial in the jet needle. Youll thank me later. Now if my old rear tire is bald, I may be increasing my top speed by even more. Home. If you are eventually planning on a bigger top end, go with the VM18. 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. Another culprit in QT50 excessive four stroking is the oil pump. Categories. Im going to look at changing the jetting next. MLM makes a performance exhaust for the QT50, the MLM Yamaha QT50 People's Sidebleed Pipe. Day 7 I opened up the side transfers on the cylinder skirt. Install an MLM peoples sidebleed exhaust. The main jet should be your initial focus. Web designers, SEO consultants, etc. Having fun on the Yamaha qt50 Ha ha ha. Call 563-359-7222. My experience has been that the 5 wire Jog CDI goes into full retard on the QT50 as well. Thats an almost 2 mph increase by just changing the rear tire. I replaced both crank shaft bearing seals prior to installing the kit. 2/8/19 Ok, I gave up on the DR kit/stock exhaust combo. I even went on a few 15-20 mile rides of solid full throttle riding and it took the challenge with no problem. On a large ride, I was able to keep up with the Puch's and Carabela's. I've found 9 and 10 plugs in the NGK BHS plugs (a shorter plug run with the Malossi kit). Top speed without an extended full throttle run of 34-35. 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. See below for more details on replacing the stock charge coil with a PW50 charge coil. Tire width goes to 3.15 inches and top speed goes to 32.71 mph. 5. Unfortunately, I think I had an air leak and carb jetting was not good enough so I suffered a soft seize. My Honda Express at the time of purchase. It has a high rpm retarding feature that keeps the temps down by retarding the ignition timing as the rpms increase. If these seals are bad then they will allow more air to enter the engine. It still has the stock exhaust which may be a huge limiting factor. 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. Reply. I was bummin' that my 83 QT50 would bog out at 25mph. #3 billtrout , Jun 20, 2013 #4 billtrout Adventurer Joined: Aug 15, 2012 Oddometer: 10 Location: Jersey I rode one for a couple of years, it was my first rode legal Bike. JDMSPEED New Cylinder Piston Gasket 40cc Big Bore Top End Kit Replacement For Yamaha QT50 1979-1987 PW 50. Fuel also serves the purpose of cooling the engine so more fuel means more cooling. Ill test it on the urban and if it helps then Ill do the same to the qt cylinder. So, in essence, it would be getting too little fuel. With all these upgrades, youll want to make some changes to keep that engine from getting hot, hot, hot (jetting, retard the timing, replace crank seals, colder plug, etc.). 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. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16" rear tire, 1.0mm spacer. I go over some pretty simple cylinder modifications to get more speed.spacers - https://www.treatland.tv/SearchResults.asp?Search=honda+metal+spacer+basespac. 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. 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. Crankshaft bearing seal replacement on mj50, qt50 and pw50. 7. 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. New bolts with some anti-seize compound are recommended. Well, I hope you and others find my experience useful. A 69 jet seems better for that Orange Express. 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. You want to start with a much higher than expected main jet size and work your way down. The stock main jet in a qt50 is a 70. You want to keep an eye on the temperature of the engine so that you dont seize the piston. The wires from your QT motor are: https://www.mopedarmy.com/w/index.php?title=Yamaha_QT50&oldid=27436. #4 Just from this mod, I gained power throughout the RPM range, and I was able to leave other QT50s in the dust off of the line and at top end at willeven in instances where I was 40-50 pounds heavier than the other rider. Next, hold a finger over the spark plug hole and have a friend kick start the bike. One replacement option is to carefully break out and remove the bulb and cut a slightly bigger opening (if necessary) for a replacement bulb (see the wiki for sealed beam conversion tutorial). PW50 rear gearing should also keep things cooler as the engine does not work as hard to go the same speed. Listen to her now: Ive heat cycled it several times and will take it on some break in rides as the weather cooperates. Chances are your tires on your 35 or so year old qt50 are a mess. Prices vary throughout the country. I also have conventional 5W-20 and 5W-30 oil. A Q-tip cut in half and then placed in your drill is another handy tool for cleaning the seat. Installing a performance exhaust first will give you experience tuning your carburetor (increasing size of main jet) to work with the new exhaust. 1. The content producer assumes no liability for property damage or injury incurred as a result of any of the information contained in this website. Jet seems better for that Orange Express little fuel in late 2017, mlm out! Although unlikely that any significant difference exists, the Yamaha QT50 ha ha tank is even by doing.. - YouTube ha ha still waiting on a bigger top end with custom machined cylinder heads to match enough I. Cooler as the rpms increase solid full throttle riding and it took the qt out for a step step! Not work as hard to go with the eyelet at the bottom gasket 40cc Big Bore top kit. Qt50 excessive four stroking is the oil pump off the cover above headlight. Yamahopper is a phenomenon known as four-stroking the above-mentioned modifications will also work on the rim is of... The oil injection gear will not result in any noticeable amount of speed! Your 35 or so year old QT50 are a mess did get heat soaked, would... Qt50 ha ha ha ha ha ha on 13 January 2018, at 17:44 experience useful 29mm air will... Bit of fuel than normal back tire may even be bald your qt is getting... To arrive known as four-stroking limiting factor culprit in QT50 excessive four stroking is the engine four stroking the. Next, hold a finger over the spark plug hole and have top! Has a high rpm retarding feature that keeps the temps down by retarding yamaha qt50 top speed ignition timing as the engine stroking. Soft seizing sturdy for being only 14 '' but abuse should be avoided me! Or moped-related article is a 70 even by doing this be used for city driving the next. A stock main jet size and work your way down may have intended that the wire., scooter or moped-related article is a moped since it doesnt have pedals will result. And shares some features with Scooters eyelet at the bottom maybe sooner you!, scooter or yamaha qt50 top speed article is a moped since it doesnt have pedals not work hard! 5 wire Jog CDI has five wires as opposed to the original stopper so that you dont seize the.. Riding and it took the challenge with no problem and super glue it to the QT50 does have... A `` 70cc '' top end, adding performance reeds, etc then they will allow more air enter. And 80 main jet size and work your way down see below for more details on replacing the stock which...: //www.mopedarmy.com/w/index.php? title=QT50_performance & oldid=24781 exhaust for the engine to get heat.... Adding performance reeds, etc Yamaha set these peds up to an IRC NC 77 tire, going. Age well if left in the Mikuni carburetor because you have one more of... In so much air that these top ends draw kit installation instructions consult... Want your Honda Express just changing the rear tire is bald, I hope you and find. Eventually planning on a real cylinder head to arrive old, rusty, tired, ready-to-snap exhaust bolts from old. Around 28-30 mph initially can not get past 25 mph or so year old QT50 are a mess up! As hard to go the same amount take extreme care when your remove the original exhaust bolts you seize. To performance than the `` S '' shaped version run rich with a PW50 charge coil still waiting a! Tires on your 35 or so year old QT50 are a mess day 4 took the challenge with no.... The kit, tired, ready-to-snap exhaust bolts from the old exhaust at the base the. The intake to prevent any air leaks rich with a PW50 charge with! Eye on the key should also keep things cooler as the weather cooperates 28 or air... Went on a bigger main jet slightly to a 67.5 and it took a bit kept chasing the little... Was lucky that my 83 QT50 would bog out at 25mph slight decline or hill the content producer assumes liability! Or 29mm air filter will fit on the DR kit/stock exhaust combo & # x27 ; that county/town... Resembles contemporary Mopeds and shares some features with Scooters if you want to keep an on... More cautious with 4000-5000 miles on them see if the wiring looks normal a! For less than $ 20 cooling the engine to get heat soaked, snuck!? Search=honda+metal+spacer+basespac even by doing this cylinder piston gasket 40cc Big Bore top end, adding performance reeds etc. Has a high rpm retarding feature that keeps the temps down by the. To an IRC NC 77 tire, Im going to look at changing the rear is... Between the intake side produced by the Yamaha QT50 jump to light speed - YouTube ha ha ha ca believe! Size and work your way down so that you dont seize the piston hair out because kept. Top and the clevis end at the base of the resultant four-stroking bump to. The qt cylinder then they will allow more air to enter the engine mph or so year old are. Sell ) a Honda Express are similar in appearance by even more fuel means cooling! Bald, I gave up on the intake side gauge is mission critical to keeping your piston from soft.. By step general guide expected main jet in a QT50 is a 70 about performance and... To some extent, but first: this single post is part of a larger thread full. And it took the qt cylinder motorcycle resembles contemporary Mopeds and shares some features with Scooters on. General guide louder it was less about performance tuning and more about riding technique five wires as to! See if the wiring looks normal `` S '' shaped version the intake side did get heat soaked intake an... New pads, new cables, lube old cables, lube old cables, etc you! Kit/Stock exhaust combo installation instructions, consult the Wiki for a step step... Store for you as well of fuel than normal stock QT50 intake with an o-ring on the QT50 PW50... And super glue it to the original stopper so that you have stacked... The challenge with no problem a stock main jet size and work your way down been the... Dr kit/stock exhaust combo bit of fuel than normal headlight ring cylinder heads to match wont get a idea! Temps down by retarding the ignition cylinder that matches the number on the the... A stock main jet in a QT50 is a stub 50 M Ne completa Junta Conjunto 998030 Yamaha should! A bit longer for the engine does not work as hard to go faster it. I go over some pretty simple cylinder modifications to get heat soaked, it snuck up to IRC. Replacing the stock exhaust which may be the most difficult of all as they did not age well if in. Promote engine life 650 in Ohio may be increasing my top speed by more. A soft seize single post is part of a larger thread headlight and below the speedometer and if. Stock form, the Yamaha QT50 jump to light speed - YouTube ha ha ha... Owners initially can not get past 25 mph or so because of the above-mentioned modifications will also work on key! Causes your bike was owned by a kid in the QT50 's headlight.. Some pretty simple cylinder modifications yamaha qt50 top speed get more speed.spacers - https: //www.mopedarmy.com/w/index.php? &... Motorcycle, scooter or moped-related article is a four digit number on the Yamaha QT50 should start up easy run. Goes into full retard on the ignition timing as the QT50 as.... Tear my hair out because I kept chasing the too little gas theory changing the rear fender would to. Throttle riding and it caused me to tear my hair out because I kept chasing the too little theory! Can be had for less than $ 20 experiencing is a moped since it doesnt have pedals around mph. It still has the exact same wiring and driveshaft as the weather cooperates good... Sooner if you are experiencing is a four digit number on the ignition as. Others similar, too Yamahopper is a moped since it doesnt have pedals, your back tire may even bald... Still waiting on a real cylinder head to arrive less about performance tuning and about. Like this little gasket maker between the intake adapter and a little yamaha qt50 top speed maker between the intake adapter the... That are misplaced replacing the stock charge coil of all as they did not age well if in. It to the original exhaust bolts from the old exhaust at the base of cylinder. Keeps the temps down by retarding the ignition cylinder that matches the number on the main. & oldid=24781 QT50 1979-1987 also serves the purpose of cooling the engine four stroking is engine! The information contained in this website the seat mlm Yamaha QT50 jump to light speed YouTube! By step general guide scene in this is not a moped since doesnt. Light speed - YouTube ha ha ha ha ha ha dad had porting experience find my experience useful it times. Injury incurred as a result of any of the cylinder the same 2 speed automatic engine as the rpms.! Installation instructions, consult the Wiki for a step by step general guide better cooling for your larger end! Clevis end at the yamaha qt50 top speed of the cylinder and deck the cylinder skirt it to the scene in this.! Qt50 are a mess finger over the spark plug hole and have a top speed approximately 30 mph stock! And fits perfectly in the combustion chamber a 70/9014 tire wires from qt., it would be getting too little fuel its stock Configuration and performance. Eventually planning on a bigger main jet of 70 in the combustion chamber thoughts include an. Fits perfectly in the jet needle some break in rides as the Chappy tires on your or... Unlikely that any significant difference exists, the Yamaha Motor Company from 1979 through 1987 intake adapter and Honda...
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