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    Melted piston!!!

    1975 75hp Johnson, thought I had a blown head gasket or warped head... Took it apart, and found a heavily damaged middle piston, and the head is the same. Very deep pitting in both. The cylinder wall is not scored, and fairly smooth, only a little bit rough, but I believe that its just very...
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    1975 75hp Johnson - Warped head? Blown gasket?

    Engine overheated first time i ever took this boat out. Had the water pump replaced, mechanic said my head was warped and motor is toast. Took it out again anyways, ran 2 tanks of gas through it pulling a tube, and for the most part, it ran pretty well, except a little sluggish sometimes...
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    Hello all! Bought a new (Used) boat, first run, problem!

    Just bought a used boat, Int. Fiberglass 15' stingray (not sure of the year, can't find any info on it), with a 1975 75hp Johnson. Seemed to run well for the first 10 minutes. Then it started running rough, and a loud squeel started coming from the throttle control box, and it died. sounded like...
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