MOPED ARMY

I have to arguew with the other guy who posted... there is plenty of QT 50 help on this board... 50cc motor is a 50cc motor... and the size of the QT50 hardly qualitfies it as a motorcycle, I call mine that only because it defined that way in the State law... Well on second thought, how about we agree that its a mini bike... :)

Oil pump... Follow the throttle cable from the handle grip to the carb. Along the way you will see a 'junction box' and then a second cable running to the oil pump. in that section there should be a couple adjusting nuts. This adjusts how much oil is pumped at any given throttle position. There is one large nut, about an inch long, a smaller normal looking nut. back the end of the cable out of the large nut, and then tighten the small nut to the large one to set the position. My cable end is about 1/4" from the smaller set nut. Look at the right side (outboard) of the oil pump. You should see a phillips screw, at or near a < looking part of the ring nuts on the pump. THis phillips screw is supposed to line up at the < when the throttle is released. I set mine a litte leaned than that, with the screw about a 1/8" under the <, as I have some trouble with the motor apparently flooding out at random times. (or how it acts anyway)

hope that helps. There was some dude selling copies of the maint. manual on this board once; I got one last year try searching the board...

Bryan and david, thanks to you both for the info!

I don't have a dial indicator, so you're probably right that I'm best to premix until I can get it tuned properly using the right tools. The inconvenience of premixing is nothing compared to the "inconvenience" of a having it seize on me!

The problem I've been having in locating the leak is that the oil just seems to emerge from underneath the bottom half of the white plastic housing that is around the injector pump. So, despite my best efforts to clean the engine up, I can't quite pinpoint the source of the leak. I'll go back and see whether I can't take the lower half of that plastic box off, to try to get a better idea of where the leak is.

Thanks again for the info, and sorry for almost starting another "what is a moped" thread! :-)

Sounds like your air bleed screw may be leaking or not tight. Take half of the plastic cover off, then you'll see a panhead screw on top, that's the bleed screw. See if it's tight. You could also have two problems. First, the delivery pipe that goes from pump to carb, may be clogged, try and clean it out. Second, that whole pump assembly simply slides out once you get to it. It uses nylon gears, sometimes those wear out. But if your simply loosing oil, I would suspect it's coming from that drain screw or something is just simple loose. Tighten everything and see if you can locate the source.