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  1. #1

    1999 Yamaha 1200 piston failure

    I had the 3rd cyl. piston breakup and score the cylinder. The inside dome of the head is pitted up good. Should I do anything withe the cylinder head ? I flushed crankcase with mystery oil and sucked it out with an electric oil pump.Replaced cylinder,piston,rings,wrist pin and rollar bearing.Should I check reed valve,exhaust,oil pump,carb ? What caused the failure?All oil lines are on.

  2. #2
    dockwalker's Avatar
    Join Date
    Mar 2010
    On the water near Belhaven,NC
    May have rear seal leak.Pressure check your engine.Have you removed your engine?

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