Re: Water Getting in Top Cylinder Yamaha 40hp Twin

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June 5, 2016 at 8:50 pm #37734
Don
Participant

    US Member

    COOL!!
    Be sure to torque that flywheel in place with a new OEM key….
    Are the flywheel/crank tapers bunged up? If so, you may want to use some fine lapping compound and lap the flywheel while the key is missing. Please be very careful not to get any compound in the upper seal.
    Keep all the new gaskets, I’m sure you will want to recheck stuff inside after running the engine a bit, so you will feel more confident about things.
    Thank YOU for doing your best to answer all our questions and provide meaningful information so we could help out….