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  1. J

    1985 Yamaha SK4 4hp 2 stroke won't start or run now; need to know compression psi.

    Last week, after running for about 20 mins the motor started slowing down. After 5 minutes, my speed at WOT ran down from 5.7 to under 4.5 MPH, then the motor died. It restarted, did the same thing 2 more times, then it stopped for good. When I pulled on the starter cord, it was unmovable. After...
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