what is a mimimum good compression P.S.I. of a 1985 yamaha QT50 and what might cause it to be lower? The QT50 does not start and gas blows out the back side of the carb.
yes it did have a reed valve.thanks for your input adam.the qt 50 was my neighbors but since has sold it.
bob, December 2009
has it got a reed valve i cant remember its ages since i had one of those they use the same engine as the pw 50 field bike,its usually the reed valve leaking if it blows back through the carb
