Didnt have gps on today. 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. Reply Tim Doll / barneyfife OP Jan 11, 2020 12:19AM Sorry about that ,missed one small detail $650 Reply Bob Naske / bobqt50 The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. Rinse and repeat several times. 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. Prices vary throughout the country. Buy yamaha qt50 online with fast delivery and free shipping. You want to start with a much higher than expected main jet size and work your way down. To combat this, many riders have eliminated the oil pump and replaced it with an oil plate block-off or an automotive freeze plug. Next, hold a finger over the spark plug hole and have a friend kick start the bike. 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. Another option is to obtain a headlight for a Honda C70. 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. All this is necessary to avoid seizing your piston as the performance exhaust will have the effect of leaning out your fuel/air mixture. Ill up my main jet. Posted by Unknown at 12:53 PM 1 comment: Labels: yamaha qt50 moped motor scooter. Perhaps around 10% bigger than stock. Crankshaft bearing seal replacement on mj50, qt50 and pw50. I found that if i rode "less agressive" and worked the throttle- 3/4 to 1/2 for instance- as i got to 25 or so, I reached a top speed of about 29 mph with throttle to spare. Trail Tech offers a 14mm gauge for $39 or so. The last mod that I'd suggest is to take your cylinder off and have someone mildly raise/enlarge the exhaust/intake ports. Engine failure is imminent. Ive had the stock cylinder slightly over 400 before. Jan 09, 2023 08:37PM. Day 1 49cc engine is on my blue qt50. 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. We'd love to have you join the discussion, but first: This single post is part of a larger thread. Expect a top speed gain of at least 10% over stock with this modification. Yamaha may have intended that the bike run rich to promote engine life. yamaha . Needless to say I didn't do any calculations to figure out how much to actually take off the head. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. 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. Performance upgrades, as listed above, exist for the QT50 that will make 50 mph~ attainable. Sharing an entire drive train with a fairly current children's dirt bike means most things can be had readily from your local Yamaha dealer. Traduire le commentaire en franais. 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. Keep this principle in mind. Available at Brennys Motorcycle Clinic in Bettendorf, Ia. Add a new exhaust gasket and put a little anti-seize on the new bolts before installing. A small diameter wire is an effective cleaning tool when attempting to clear the idle jet of whatever crud that has narrowed its passageway. Again, a performance exhaust will call for a larger main jet in the carburetor. A 69 jet seems better for that Orange Express. My Honda Express at the time of purchase. Remove the charge coil and install on the QT50 stator. Top speed without an extended full throttle run of 34-35. Any of the above-mentioned modifications will also require a bigger main jet to compensate for the additional air that these top ends draw. Trail Tech makes a temperature gauge which has a copper washer that replaces your current spark plug washer. 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 wires from your QT motor are: https://www.mopedarmy.com/w/index.php?title=Yamaha_QT50&oldid=27436. It can be incredibly frustrating to spend $200 on a performance exhaust and then have the kickstand bang it every time you use it. A stock QT50 has a top speed of 30 mph, and takes a while to reach it. Automobiles & Motorcycles; Tools; yamaha qt50. 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. 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. I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. 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). Many QT50 owners initially cannot get past 25 mph or so because of the resultant four-stroking. 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. 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. This part is used to reduce the degree of performance for your motorcycle, for yamaha. 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. Im still undecided on what weight synthetic oil to try. It was a heck of a lot of fun and cheap transportation for me before I could get a carif you have any questions or comments please feel free to email me! Just drill a couple holes for some small screws and nuts (thread locker is handy here). This system eases cold starting: when the key is placed in the "start" position, the ignition supplies a stronger than normal spark for initial starting, but does not allow the engine to rev so as to avoid burning the piston. Try a hotter spark plug; The fairly rigid frame on that qt50 starts shaking violently and 25 to 40 mph passes in a heartbeat or two. Kevlar brake pads and stiffer clutch springs! I had these 3 mods done to my QT50 and it really enhanced my enjoyment of riding it around during the summers. 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. Stay tuned. . Get an aftermarket mesh air filter. 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. Yamaha QT50 Tim Doll / barneyfife Jan 10, 2020 10:45PM Yamaha QT50 for sale excellent condition 2500 miles, clear title , one owner. I hope compression gets better as the rings seat. 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. 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. Even if they have considerably less miles, they are still 35 or so years old. Best jetting for VM18 on this setup seems to be 20 idle jet and 80 main jet. This is the trade off for more top speed. 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. My Yamaha QT50 . 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. Now my former paperweight had a new lease on life. Manufactured. Ron Peek / yamahauler. Many have reported that the 1979 model had a defective charge coil on the stator. 41.6mph. Be mindful of not completely eliminating all four stroking. 9. 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. Chances are you still wont get a good idea of how rusty the tank is even by doing this. 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). And cylinder got sanded down after 1.5mm of spacers added to open up all ports fully except intake at BDC. Needs both tires subtract $95-105; Does the owner have title? You can also get an idea as to its compression by using the kick start. I meant to look but kept forgetting but she doesnt start to hook up till low 30s. Ill test it on the urban and if it helps then Ill do the same to the qt cylinder. 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. It is considered a motorcycle by most states. You can gain a little acceleration back by installing stiffer clutch springs. The simplified driveshaft setup makes wheel changes easy. Picture the maze that the incoming air had to follow just to get to the carb. $650 in Ohio may be the same as $900 in California or New York. Youve basically created a longer stopper and this will stop the center stand before it hits the new exhaust. It still has the stock exhaust which may be a huge limiting factor. Day 4 took the qt out for a ride with Puch head and almost fully opened ports. Once it gets on the pipe though, hang on! Chances are your tires on your 35 or so year old qt50 are a mess. When I grabbed a handful of throttle when on the pipe (anywhere above ~18mph for mine), that tiny chainsaw motor meant business! Your main jet is way too big. If you lose the oil pump, you also lose some of that snap-back tension. 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). I was bummin' that my 83 QT50 would bog out at 25mph. Controlling the heat produced by a bigger top end and/or a performance exhaust is a common issue with QT50s. QT50 Oil injection removal - An oil injector block off plug can be found if you choose to go to premixed fuel. She doesnt start to hook up till low 30s that i 'd suggest to! Follow just to get to the carb tires subtract $ 95-105 ; the. Exist for the qt50 stator? title=Yamaha_QT50 & oldid=27436 is even by doing this be if! Exhaust which may be the same as $ 900 in California or new York the idle jet of whatever that! Speed of 30 mph, and takes a while to reach it - an oil block... Stock cylinder slightly over 400 before so years old to my qt50 and pw50 has narrowed its.! 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Then ill do the same to the qt cylinder Clinic in Bettendorf, Ia to get the. Exhaust/Intake ports new lease on life are still 35 or so exhaust which may be a huge factor!
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