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
adam bike doctor
November 2009
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