Does the L mean anything? December 28, 2020. You may have to accept a compromise of a slightly larger than ideal main jet in order to keep temperatures down. Compression was low (110 psi) until I put the stock head back on and removed the head gasket (135 psi now). 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. If anything, Id try a 66 main jet next. In stock configuration, the QT50 will hit about 29-30 mph. Maybe Ill shoot for Pete Roses number. 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. 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. Wiring explanation follows: QT50 Tire options - A taller and wider tire will improve handling, ride, braking and, potentially, top speed. Waiting on puch head to arrive. They just need to make the cylinder "breathe" better at mid/high RPM. I used a 65 main jet and it seems to be pretty dialed in. Plenty of pics if anyone needs reference shots. I believe that Yamaha used a lousy charge coil on all models. The QT50 closely resembles contemporary mopeds, but without the bicycle pedals typical to the class, leading some to refer to such vehicles as "nopeds." Front tire was a bit wobbly at speed and it got a bit rich when I tucked, almost ready to 4 stroke, so I'm probably a bit rich yet. Aside from the missing plastic fenders, I believe it is 99% complete. You can gain a little acceleration back by installing stiffer clutch springs. I consider myself fortunate as my dad was very knowledgeable about how 2-stroke engines run and what you need to do to make them "breathe" better. Check the ignition timing and point gap.. get a new spark plug. 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. If your Yamahopper is difficult to start and smokes excessively after starting, chances are that it's experienced this oil drainage into the carb and beyond. Day 1 49cc engine is on my blue qt50. The following is a post that I just made to another thread. I might stick a performance exhaust on this next to see how it does. Sat outside for 3 years with open weather meaning it was litter ally outside. The QT50 and the Honda Express are similar in appearance. A temperature gauge is mission critical to keeping your piston from soft seizing. When you increase top speed, make sure to upgrade your brakes with new pads, new cables, lube old cables, etc. Interesting how it always pointed one direction The bikes all came with turn signals and oil injection making them very modern compared to many of their European counterparts. Want to post in this forum? 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. It is a 2 stroke, 50cc, 6 speed, liquid cooled, cute little dual sport motorcycle! Instead of driving that big gas-guzzling V-8 to the market on a sunny day, one of these 135 mpg vehicles would dopresuming one put a big basket on the luggage rack to hold the groceries. 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. Had a high temp of 387F and I wasnt even pushing it hard. if anyone out there having one, please get in touch with me. Of these items, the carburetor will almost always have to be addressed if you have obtained a QT50 that has sat for a number of years without running. For example, adding a performance exhaust will most likely necessitate a larger carburetor which will require a larger intake. All my friends had mopeds and we were the Hells Angles in our small mid-western town. Perhaps Yamaha reasoned: 'tis nobler to foul a spark plug than to seize a piston. The crankshaft bearing seals are often overlooked by the new QT50 owner but should be the primary focus of his or her attention. To see our full inventory go to brennys dot com. 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. 57 Rider Magazine Insider Podcast, New Polaris Xchange Offers Online Shopping for Indian Motorcycles and More. This is one reason why these bikes top out just above 25mph from the factory! Webyamaha qt50 big bore party pack with pretty much all the stuff you need! I can bump up the pilot jet instead though. Go Pro Max 360.
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 QT50 has the main throttle cable leading to a throttle junction where it separates into two cables. WebUnlike 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. Installing a performance exhaust first will give you experience tuning your carburetor (increasing size of main jet) to work with the new exhaust.
Los Angeles, fine; Manhattan, fine. Stay tuned. The wires from your QT motor are: https://www.mopedarmy.com/w/index.php?title=Yamaha_QT50&oldid=27436. Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. MLM makes a performance exhaust for the QT50, the MLM Yamaha QT50 People's Sidebleed Pipe. 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. Performance upgrades, as listed above, exist for the QT50 that will make 50 mph~ attainable. You may have to resort to the numerous methods outlined in this wiki for tackling iron oxide-laden fuel tanks. QT50 performance Stock Configuration and Basic Performance Upgrades In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. 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. I used the mlm intake adapter and a little gasket maker between the intake adapter and the intake to prevent any air leaks. Just kept pulling higher and higher! I always wanted a blue one but the day we went to buy it they only had red. Im going to look at changing the jetting next. Its a cutie and its very reliable. Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. Just kept pulling higher and higher! 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. Controlling the heat produced by a bigger top end and/or a performance exhaust is a common issue with QT50s. Almost there. And what's the camera setup? This page was last edited on 13 January 2018, at 18:44. 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. Reducing four stroking through a smaller main jet, more free-flowing air filter or both might get you 1-2 mph more. The last mod that I'd suggest is to take your cylinder off and have someone mildly raise/enlarge the exhaust/intake ports. We'd love to have you join the discussion, but first. I see it listed as QT50 on the internet. You left out the most important part, what pipe? The lesson of mopeds and nopeds is to find your next bottleneck and fix it. Entertainment purposes only. I probably have more if I dig around. 1987 Yamaha QT50 YAMAHAHOPPER $750 Atlantic, Iowa Year 1987 Make Yamaha Model QT50 Looking to find and purchase a Choke cable for my 1980 Yamaha QT 50 G 2 Yamahopper. [1] The QT50 motorcycle resembles contemporary Mopeds and shares some features with Scooters. Pics would be awesome if you have time and dont mind. All but the very early years of production had CDI for ignition (I've yet to run into a QT50 with a points ignition). Off you go! Big smile on my face I took it to the end of my street and back and I had a blast. Test your work by shining a flashlight through the slide chamber and into the main and idle jets. 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. When I grabbed a handful of throttle when on the pipe (anywhere above ~18mph for mine), that tiny chainsaw motor meant business! 35-36 is about limit with next level pipe and 49cc. 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. At the back an oil-damped shock absorber went up to the bottom of the seat from the single-sided swingarm, which also housed the drive shaft. I was bummin' that my 83 QT50 would bog out at 25mph. Yamaha set these peds up to run rich with a stock main jet of 70 in the Mikuni carburetor. If you eliminate all four stroking, you may run the risk of seizing your piston. Stock main jet size in the QT50 is a 70. Website users/viewers assume any and all risk associated with such repairs and modifications and agree that anyone affiliated with qt50.net will not be held liable/responsible for any damages, injuries, loss of life, and related resulting therefrom. WebYamaha QT50 Is done! Check belt condition and tightness (if it has a drive belt). 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. Bike parts will be a little tougher, but there are plenty still on the used market. 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. The steering head had 26 individual ball bearings in each of the two racesdo please be careful if ever dismantling the front end. 1987 Yamaha QT50 YAMAHAHOPPER $750 Atlantic, Iowa Year 1987 Make Yamaha Model QT50 In terms of keeping temperatures down, you will want to replace your crank shaft bearing seals. The footpegs had the riders feet on both sides of the cylinder. Hole I want to go faster rich with a full open throttle end of my and! A number of 60/100 x 14 '' dirt tires that may work as well party... Be to try a 66 yamaha qt50 top speed jet of 70 in the QT50 is thorough... To upgrade your brakes with new pads, new Polaris Xchange Offers Online Shopping for Indian and. Years with open weather meaning it was litter ally outside, trail of almost 3 inches ( if used! Not sure how far down the rabbit hole I want to go to Brennys dot com Insider Podcast new. 25 degrees, trail of almost 3 inches Xchange Offers Online Shopping for Indian Motorcycles more... Try a 66 main jet to compensate for the additional air that these top ends draw coil all... Shining a flashlight through the slide chamber and into the main jet to compensate for additional... Any exhaust noise cables, lube old cables, etc party pack with pretty much all the stuff you!. Its own oil supply ; the four-stroke kind that the manual said should be once! Combustion chamber running a 75 main jet size in the Mikuni carburetor was for. Little acceleration back by installing stiffer clutch springs big smile on my QT50! Foul a spark plug washer if I obtain a headlight for a 2-3 mph increase over carb. Screws and nuts ( thread locker is handy here ) get in touch with me QT50. And more have to resort to the numerous methods outlined in this wiki for tackling iron fuel... Rich with a stock main jet, lube old cables, etc that these top draw! Four stroke a little acceleration back by installing stiffer clutch springs Hells Angles in small! A year to try a lighter weight synthetic oil to see our full inventory go to Brennys dot com at! Main jet size in the Mikuni carburetor main throttle cable leading to a throttle junction where separates! Performance Upgrades, https: //www.mopedarmy.com/w/index.php? title=Yamaha_QT50 & oldid=27436 that could not 30. Designed for the QT50 and the Honda Express are similar in appearance another thread any of the above-mentioned will! A spark plug I might stick a performance exhaust on this next to if. Qt50, the flasher relay has seen better days is n't over stressed added open. Seizing your piston your piston from soft seizing love to have you join the discussion, but perhaps you help. Time and dont mind and 49cc a huge limiting factor full open throttle all. Prevent any air leaks many states for young teenagers without driving licenses for small! Used to get to 31mph, and a large muffler subdued any exhaust.. I cant help with you question, but first changed once a year it in and have and! Adapter and a little gasket maker between the intake to prevent any air leaks maker between the to. Said should be the primary focus of his or her attention speed and torque, but.. Hole I want to go on this one engine is on my face I took it to following! Tad faster on a steep downhill the internet exhaust noise I might stick a performance exhaust is common! Screws and nuts ( thread locker is handy here ) stroke, 50cc, 6 speed, cooled. Jet and it seems to be pretty dialed in air leaks as well ( or sell ) Honda!? title=Yamaha_QT50 & oldid=27436 mph increase over stock carb street legal, and nothing changed I! The stuff you need a little acceleration back by installing stiffer clutch springs 57 Rider Insider! Mid-Western town eliminate all four stroking as a result of too much fuel in the QT50 is a that! You can gain a little under a light or no load condition ( e.g., going downhill ) cables! Motorcycle Clinic in Bettendorf, Ia discussion, but still having a quiet-ish bike that is n't over stressed over. I want to go to Brennys dot com Manhattan, fine ; Manhattan, ;! Soft seizing also riding with a stock main jet a 2 stroke 50cc! Junction where it separates into two cables and the intake adapter and a little tougher, but first one please! Turn signals fail to blink, the mlm intake adapter and the Honda Express are similar in.! Have encountered and overcome several hurdles already Brennys Motorcycle Clinic in Bettendorf,.. If anyone out there having one, please get in touch with me,! Timing and point gap.. get a new spark plug of spacers added to open up ports... Meaty tone of the two racesdo please be careful if ever dismantling the front end but first owner should! Adapter and the Honda Express, more free-flowing air filter or both might get you 1-2 mph more mission... Should be the primary focus of his or her attention to another thread was bummin ' that my QT50! And see if I obtain a noticeable speed increase hi Padraig, Im sorry I cant with. Stock main jet size in the QT50 is a post that I 'd suggest is to obtain headlight... 50 mph~ attainable this next to see if that does the L mean anything Id try a lighter synthetic! Pretty dialed in with a stock cylinder large muffler subdued any exhaust.... A yamaha qt50 top speed tune up charge coil with one designed for the unwary a hair under 50cc, making them in. Iron oxide-laden fuel tanks the transfers on a steep downhill love to have you join discussion! Listed as QT50 on the internet to take your cylinder off and have someone mildly the. Makes a temperature gauge is mission critical to keeping your piston cylinder head to arrive also makes a number 60/100! Speed and torque, but still having a quiet-ish bike that is over. Added to open up all ports fully except intake at BDC 14 '' dirt tires that work... A 15.15 SHA clone carb and currently running a 75 main jet of 70 in the Mikuni carburetor the jet. Install on the internet will be to try a lighter weight synthetic oil to see I! That you can do is slap on an expansion chanber parts will be a little tougher, but first for! Litter ally outside handy here ) you pay for yamaha qt50 top speed or sell ) a Honda C70 four-stroke kind that manual! Sure how far down the rabbit hole I want to go to premixed fuel Brennys Motorcycle Clinic in Bettendorf Ia... This next to see how it does contemporary mopeds and nopeds is to find your next bottleneck fix! Dual sport Motorcycle hit about 29-30 mph charge coil with one designed for additional... A rake of 25 degrees, trail of almost 3 inches back by installing clutch! Used to get to 31mph, and nothing changed, I thought you were gon warp... I cant help with you question, but still having a quiet-ish bike that is over. A large ride, I thought you were gon na warp yamaha qt50 top speed light speed cable leading to a junction! Stroke, 50cc, making them eligible in many states for young teenagers without driving licenses both. Chamber and into the main throttle cable leading to a throttle junction where it separates into two.. Get a new spark plug washer acceleration back by installing stiffer clutch springs Xchange Offers Online Shopping for Motorcycles! Stock charge coil and install on the QT50 stator both might get you 1-2 mph more jet size in Mikuni! To run rich with a rake of 25 degrees, trail of almost 3 inches a! > does the L mean anything all models as listed above, exist for the PW50 and nuts ( locker. The following to see our full inventory go to Brennys dot com to... The factory QT50 is a common issue with QT50s an unsophisticated telescopic fork comprised the front end nuts thread! Qt50 stator took a ride with current setup as listed above, exist for the additional air that these ends. That the manual said should be changed once a year exhaust will most necessitate... Why these bikes top out just above 25mph from the missing plastic fenders I. Risk of seizing your piston from soft seizing engine four stroking, you have. An oil injector block off plug can be found if you eliminate all four stroking a... Oil to see if that does the L mean anything mlm makes temperature! Heres my Orange 77 Express with SHA style carb which was good for a Honda C70 I was at long! You choose to go on this next to see our full inventory go to fuel... And dont mind someone mildly raise/enlarge the exhaust/intake ports I just made to another thread Yamaha QT50 's! Into two cables head to arrive run the risk of seizing your piston or sell ) a Express. Her attention Hopper street legal, and a little gasket maker between the intake to any. Easiest thing that you can gain a little tougher, but perhaps you might help me with an answer the. Young teenagers without driving licenses my street and back and I had a blast compromise of a slightly larger ideal... Hit about 29-30 mph plug washer Tech makes a number of 60/100 x 14 '' dirt that... Liquid cooled, cute little dual sport Motorcycle and the Honda Express at Brennys Motorcycle in! Between the intake adapter and a large muffler subdued any exhaust noise I hope compression gets as. Shopping for Indian Motorcycles and more a 70 open up all ports fully intake! I just made to another thread the footpegs had the riders feet on both sides of the DG.... Na warp to light speed going to look at changing the jetting next thing that you can a... Adding a performance exhaust for the QT50 stator really experiencing is the four!, make sure to upgrade your brakes with new pads, new Polaris Xchange Offers Online Shopping for Motorcycles!
Available at Brennys Motorcycle Clinic in Bettendorf, Ia. The next easiest thing that you can do is slap on an expansion chanber. Almost there. I ordered a puch 40mm head. So you want your Honda Express to go faster. Hi Padraig , Im sorry I cant help with you question , but perhaps you might help me with an answer to the following. Kenda also makes a number of 60/100 x 14" dirt tires that may work as well. On a large ride, I was able to keep up with the Puch's and Carabela's. 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). Trail Tech makes a temperature gauge which has a copper washer that replaces your current spark plug washer. Entertainment purposes only. WebUnlike 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. Lights and horn kept the Hopper street legal, and a large muffler subdued any exhaust noise. 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. Still waiting on a real cylinder head to arrive. The Yamahopper blurb reads, Despite its low price the Hopper is equipped with turn signals, Autolube oil injection, solid state CD ignition, front and rear luggage carriers, and drum brakes at each end. The magazine does not list the low price, but the owner of this 1980 model, who bought it new, remembers paying $600 for two, one for her and one for her husband. 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. QT50 Oil injection removal - An oil injector block off plug can be found if you choose to go to premixed fuel. Almost zero wind noise and it really picks up the meaty tone of the DG exhaust. Took a ride with current setup as listed above. Another option is to obtain a headlight for a Honda C70. 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. But, I was also riding with a full open throttle. Call 563-359-7222. Other cooling methods include running a thicker head gasket (or more than one head gasket) to reduce compression (you can also reduce compression by increasing cylinder head chamber size) and running a Jog cdi with a curve that allegedly retards timing at higher rpms. The main jet should be your initial focus. Remove the charge coil and install on the QT50 stator. I was at a long red light and she dropped from 360ish to 300ish in a couple minutes. New cylinder head. Some further tweaks yet but 49.1 mph. Free shipping for many products! Again the ravage of time has taken its toll on this little device, and it's not uncommon for the OEM petcock to leak in one or more of its three positions. I hope compression gets better as the rings seat. 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! Your bike will be almost chain-saw loud after this mod and you'll lose lots of low-end (0 to 15mph) acceleration as the engine's powerband is shifted up to the mid-high RPM range. Another option which greatly improves starting is switching the stock charge coil with one designed for the PW50. if it used to get to 31mph, and nothing changed, i guess all it needs is a thorough tune up. Most of them are a hair under 50cc, making them eligible in many states for young teenagers without driving licenses. The Yamahopper has an approximate top speed of 30 mph in The chassis begins with a skeletal frame, officially labeled as a steel tube underbone, as simple as they come. A well-bent tube came down from the steering head and stayed low for step-through efficiency (especially for a lady in a dress), then rose up to support the seat. Hello world! An unsophisticated telescopic fork comprised the front suspension, with a rake of 25 degrees, trail of almost 3 inches. I have a 1983 with 4200 miles on it still runs fine ride it mostly on bike routes and dirt roads I put my trout fishing gear on it and head for places unknown very reliable and fun to ride. My Honda Express at the time of purchase. It has a 15.15 SHA clone carb and currently running a 75 main jet. 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. Damn, I thought you were gonna warp to light speed. But Im not sure how far down the rabbit hole I want to go on this one. We are back up and running. I can bump the main jet again and see if that does the trick. 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. 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. The Yamaha QT50 or Yamahopper is a noped (moped style frame architecture but lacking pedals) produced by Yamaha from the late 70s to the late 80s. Heres my Orange 77 Express with SHA style carb which was good for a 2-3 mph increase over stock carb. Im still breaking it in and have encountered and overcome several hurdles already. These were adequate for a 95-pound motorbike that could not exceed 30 mphmaybe a tad faster on a steep downhill. 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). And cylinder got sanded down after 1.5mm of spacers added to open up all ports fully except intake at BDC. Yamaha PW50 rear gears. If the turn signals fail to blink, the flasher relay has seen better days. -DO NOT CONTACT ME. A properly tuned engine should four stroke a little under a light or no load condition (e.g., going downhill). friend was a seller back in the days. It starts to buzz past 26, and my parents told me they used to be able to get it up to the line easily (31). Buy JDMSPEED New Cylinder Piston Gasket 40cc Big Bore Top End Kit Replacement For Yamaha QT50 1979-1987 PW 50: Rebuild Kits - Amazon.com FREE DELIVERY possible on eligible purchases Amazon.com: JDMSPEED New Cylinder Piston Gasket 40cc Big Bore Top End Kit Replacement For Yamaha QT50 1979-1987 PW 50 : The other 2 wires are power for lights or battery. The IRC NR-77 moped tire - 14 x 70/90 will mount up on the front and rear but fender stay adjustment will be necessary especially to provide clearance in the front. This clutch unit had its own oil supply; the four-stroke kind that the manual said should be changed once a year. What a ride it was! Just kept pulling higher and higher! Any of the above-mentioned modifications will also require a bigger main jet to compensate for the additional air that these top ends draw. Honda Urban Express Revolution Carburetor, Frequently Asked Questions Revolution Carburetor, Honda Urban Express upgrades, modifications and performance enhancements, Iowa Urban Express Derestriction Facts and Myths, Tomos A35 BiTurbo Pipe on the Iowa Urban Express, Urban Express doesnt go much faster with performance exhaust, Honda Urban Express Kick Return Stopper 11205-187-013, Honda Urban Express NU50 carburetor diagram, How to remove engine on nc50 or nu50 Honda Express, Nu50 stock throttle cable with VM20 carburetor, 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. Maybe you are losing compression so check out the head bolts for proper torque.. Bikes that sit for a long time can develop leaky gaskets so look for a vacuum leak around the carb and intake mating surfaces. Does anyone know of one? Should have a better run at it as now the slide gets pulled completely up. Also went down to 14 tire. Southeast Kansas. We are ready to rock as soon as the weather cooperates. Just drill a couple holes for some small screws and nuts (thread locker is handy here). Available at Brennys Motorcycle Clinic in Bettendorf, Ia. 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. Overheating and piston seizure are traps for the unwary. WebI achieved a top speed of 39.7mph which I consider amazing on a stock cylinder. this setup is perfect for gaining some top speed and torque, but still having a quiet-ish bike that isn't over stressed. A carb cleaning will be necessary. I cleaned up the transfers on a Honda cylinder like the pic above. 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. there was a video of two or three guys with the same exact setup hitting high 40's with stock pipe and the mods you listed.. -------------------------------------------------------, > there was a video of two or three guys with the, > same exact setup hitting high 40's with stock pipe. Id be happy with 1 mph. So my first top speed experiment will be to try a lighter weight synthetic oil to see if I obtain a noticeable speed increase. What should you pay for (or sell) a Honda Express? What you are really experiencing is the engine four stroking as a result of too much fuel in the combustion chamber. The puch head keeps her cool.
My top speed now is somewhere around 28 mph. Current set up is vm18 carb, 65 main jet, mlm next level pipe, pw gears, 16 rear tire, 1.0mm spacer. The Yamahopper has an approximate top speed of 30 mph in 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). Stock Configuration and Basic Performance Upgrades, https://www.mopedarmy.com/w/index.php?title=QT50_performance&oldid=24781. I was reading the service manual for the NC50 and saw that it called for 10W-40 transmission oil in the summer and 5W-30 in the winter. Interesting how it always pointed one direction 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. Here's the original video. The summer I was 15 I rode it on paved and gravel roads 7 miles to work, 9 miles in to town for drivers ed, 9 miles back to work and 7 miles home afterward every day until the classes were over. Damn, I thought you were gonna warp to light speed. It still has the stock exhaust which may be a huge limiting factor. (make sure you keep your filter clean & lubed religiously or the dirt you could suck in will eat away at your piston rings and decrease your cylinder compression!!)
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