yamaha qt50 top speed

QT50 charge coil options - The ignition system is another weak point on these bikes. Many QT50 owners initially cannot get past 25 mph or so because of the resultant four-stroking. Web designers, SEO consultants, etc. Youll thank me later. Titled and ready to go. Want to post in this forum? I just bought an MLM peoples sidebleed pipe for my QT50/MJ50. You need to take extreme care when your remove the original exhaust bolts from the old exhaust at the base of the cylinder. Reply Stephen Keller / keller_stephen Jan 10, 2020 11:49PM Price? Next, hold a finger over the spark plug hole and have a friend kick start the bike. Im located in Ohio. 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. In sunshine red with some fresh updates. Top speed of 28.5. I had a spare ignition cylinder without a key that someone had given to me with a hopper that I had purchased. Day 1 49cc engine is on my blue qt50. Right and left side crankshaft seals can be found on ebay or treatland.tv. Its like an old house. So it has a 67.5 main jet in it now but a 70 jet is way too rich. Needs both tires subtract $95-105; Unfortunately, I think I had an air leak and carb jetting was not good enough so I suffered a soft seize. What should I look for? I put 15,000 mile's on it. . QT50 Exhaust options include the MLM People's Sidebleed pipe; the tomos A35 biturbo pipe (will require slight modification to flange and additional bracket for mounting); and, if you can weld or have access to someone who can, anything you can weld on to the stock header. Or fastest delivery Jan 20 - 24 . 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. The puch head keeps her cool. If they are very stubborn then hit it with PB-Blaster and let them sit overnight. The QT50 has a sealed beam headlight. Take a flashlight and take the lid off the gas tank. 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. The Dell'Orto SHA 15.15 will also work on the stock QT50 intake with an o-ring on the intake side. Maybe Ill shoot for Pete Roses number. 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. Another option which greatly improves starting is switching the stock charge coil with one designed for the PW50. Half the package or less is plenty. Be mindful of not completely eliminating all four stroking. 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. Day 3 I put a bigger pilot jet in the blue Qt. If your bike was owned by a kid in the past, your back tire may even be bald. Engine failure is imminent. Chances are you still wont get a good idea of how rusty the tank is even by doing this. "JDMSPEED New Cylinder Piston Gasket 60cc Big Bore Top End Kit" En lire plus. If the turn signals fail to blink, the flasher relay has seen better days. In 2018, MLM introduced the MLM yamaha QT50 techno EDM circuit pipe. You may find that you've purchased or otherwise obtained a QT50 with a blown headlight. Im still undecided on what weight synthetic oil to try. Ive began another Express speed project. -DO NOT CONTACT ME. Makes me wonder how anyone could really go fast with a stock head. If the bike doesnt run dont pay more than $150; Replacement of its gasket can be undertaken or a cheap aftermarket fuel cock can be had with little trouble. 99. $44.99 $ 44. Of course, youll need to change your main jet to a bigger one to compensate for the additional air (you need to keep your fuel/air ratio similar if you add more air, you need to add more fuel). 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). A stock QT50 has a top speed of 30 mph, and takes a while to reach it. Day 6 I let her eat today. I notice sometimes at full throttle it will run rougher, make a different noise, seem to hesitate and check up. A temperature gauge is your best friend and a cheap insurance policy on your quest for better performance. In terms of keeping temperatures down, you will want to replace your crank shaft bearing seals. You should see a large circle of light through the main jet and a much smaller circle of light through the idle jet. Whats the trade off? Having fun on the Yamaha qt50 AboutPressCopyrightContact. South of the gas tank is the resting place of the qt's petcock. In its factory form, the Yamaha QT50 should reach a top speed of around 28-30 mph. This is the trade off for more top speed. A Q-tip cut in half and then placed in your drill is another handy tool for cleaning the seat. I ordered a puch 40mm head. 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. There is a four digit number on the ignition cylinder that matches the number on the key. #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. This leads to hacking into the wiring. Yamaha qt50 jump to light speed - YouTube Ha ha ha. I can probably jet higher after getting the piston to clear the ports. How do I fix it so that my center stand/kickstand doesnt hit it? Ive had the stock cylinder slightly over 400 before. 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. Expect a top speed gain of at least 10% over stock with this modification. 1. You may also choose to richen up your jet needle by moving the clip down one or more positions. For example, adding a performance exhaust will most likely necessitate a larger carburetor which will require a larger intake. QT50 Oil injection removal - An oil injector block off plug can be found if you choose to go to premixed fuel. 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. Cylinder Piston Gasket Head Set Fits Yamaha PW50 (1981-2018) Bore 40mm. And I refuse to pay more than $150 for a non-runner. I treat all these as non-runners. Now my former paperweight had a new lease on life. 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. The 50 in the name is derived from the 50cc engine displacement. 3. 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! Yamaha Yamahopper qt50 top speed run, hang on! One leads to the oil pump and one leads to the carburetor. It four-strokes fairly easily in the stock configuration so that you don't overheat and soft-seize under low load at full throttle. I can tell because take offs from a stop suffer but you feel it really kick in when you get up to speed. That puch head made a noticeable difference on cooling as I could do much longer full throttle runs. Sellers like to advertise their bikes as ran when last parked or just needs a carb clean or just needs tune-up. Adjust the oil injection pump; Yamaha's conservative approach leads us to our first performance upgrades. Im still breaking it in and have encountered and overcome several hurdles already. Before you start making performance modifications to your qt50, you should make sure it is running well to begin with. 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. 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. So, in essence, it would be getting too little fuel. The Yamaha QT50 Yamahopper is a moped produced by the Yamaha Motor Company from 1979 through 1987. MLM makes a performance exhaust for the QT50, the MLM Yamaha QT50 People's Sidebleed Pipe. I probably have more if I dig around. This posting echoes Fred's post to some extent, but I was lucky that my dad had porting experience. Does the owner have title? So the caveat here is just because it runs and rides well doesnt mean you are home free. 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. Yamaha MJ50 Towny two-speed crankcase and right-side swingarm. Ive had at least two qt50s with bald back tires. The qt's metal tank can become rusty over time and especially if stored with gas in the tank. This headlight has a replaceable bulb and fits perfectly in the QT50's headlight ring. 6. Honda Express with tecno boss exhaust and 1.5mm cylinder spacing. Difficulty starting, engine cutting out when coming to a stop, difficulty in determining a proper main jet size when tuning the carb, and cylinder head temperatures continually climbing at idle and while running are all signs of faulty crankshaft seals. This was helpful on the urban express project. The Yamahopper has an approximate top speed of 30 mph in stock form, and thus can be used for city driving. The lesson of mopeds and nopeds is to find your next bottleneck and fix it. But no worries. 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. Had a high temp of 387F and I wasnt even pushing it hard. 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. 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. My initial acceleration may be a bit slower with the bigger rear tire. Having fun on the Yamaha qt50 Ha ha ha. 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. Im hoping an extra 25 psi helps out quite a bit. It is considered a motorcycle by most states. -DO NOT CONTACT ME. 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. 6. Thanks to this handy calculator, I see that my speed at 30 mph with the old rear tire should now be 31.53 mph. At full throttle, the bad seals may let in so much air that it causes your bike to die. The wires from your QT motor are: https://www.mopedarmy.com/w/index.php?title=Yamaha_QT50&oldid=27436. 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. The original tire size on the qt50 is 2.25 wide by 14 in diameter. It has a high rpm retarding feature that keeps the temps down by retarding the ignition timing as the rpms increase. Anything goes only rule is keep the 49cc engine. I solved it by going from a 102.5 jet to an 87 and finally to an 85 main jet. 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. Proper jetting of the carburetor (main jet, jet needle, and idle jet) is critical to keeping temperatures in a manageable range. Another option is to remove the plastic gear from the oil pump and re-install the gearless pump. Look how wrong you can be. Truth is it is getting too much gas and dying as a result. Day 1 - 49cc engine is on my blue qt50. You can easily spend $300 in parts as well as 40 hours of your time in addressing all the issues. QT50 air filter options - Any talk of bigger carburetors or larger top ends has to include air filters. Rinse and repeat several times. Dont try that with those niche kits. Ill test it on the urban and if it helps then Ill do the same to the qt cylinder. 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. When I grabbed a handful of throttle when on the pipe (anywhere above ~18mph for mine), that tiny chainsaw motor meant business! Stock Configuration and Basic Performance Upgrades, https://www.mopedarmy.com/w/index.php?title=QT50_performance&oldid=24781. Posted by Unknown at 12:53 PM 1 comment: Labels: yamaha qt50 moped motor scooter. Stock cylinder head is horrible on cooling. If the bike pulls to one side while riding, it may have bent forks. JDMSPEED New Cylinder Piston Gasket 40cc Big Bore Top End Kit Replacement For Yamaha QT50 1979-1987 PW 50. Ill make videos of each top speed run and post them here. 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. 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. Jemco exhaust, etc. Stay tuned. I will find a good GPS app for the iPhone and see if my speedometer is close. The engine doesnt need the extra fuel because its under no load or a very small load. 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. Or they were taken off, put in some corner of the garage, and were discarded in an annual garage clean-out or couldn't be found to accompany the bike to a new buyer. 40.1mph. Ive used the vinegar and salt method but now mainly use EvapoRust. 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. It also seems to help if you reconnect the common ground shared between the charge coil and the light coil. I also went to a BP4HS plug and ditched the colder BP6HS plug. 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.

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