Where is the oil pump on a moped QT50?
The QT50 has the main throttle cable leading to a throttle junction where it separates into two cables. One leads to the oil pump and one leads to the carburetor. The oil pump, slide spring and junction box all provide tension to snap the throttle back after you let go.
Do you need to clean the gas tank on a Yamaha QT50?
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. A carb cleaning will be necessary. 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.
What kind of jet does a Yamaha QT50 have?
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. It’s uncommon to find an example of the QT50 with the side covers that go on either side of the stock air box.
What kind of exhaust does a QT50 moped use?
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. MLM makes a performance exhaust for the QT50, the MLM Yamaha QT50 People’s Sidebleed Pipe.
When did the Yamaha QT50 moped come out?
The Yamaha QT50 Yamahopper is a moped produced by the Yamaha Motor Company from 1979 through 1992. The 50 in the name is derived from the 50cc engine displacement.
What’s the bending limit on a Yamaha QT50?
Should anyone ask what the valve’s bending limit is on the QT50, it is 0.8mm; potentially useful knowledge when a barroom of Yamahopper owners are making bets. Yamaha’s Autolube system made sure the gas and oil mixture was as close to perfect as possible.
How does the ignition work on a Yamaha QT50?
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.
When did Yamaha start using autolube on bikes?
Yamaha’s Autolube system made sure the gas and oil mixture was as close to perfect as possible. The company had been using this remote oil system in racing bikes in the early ’60s, but the first use on a street bike was in 1964, with much acclaim.