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    1993 Yamaha 40hp 2 stroke lacking RPM

    No, since I bought it used it doesn't rev properly
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    Lack of RPMs Yamaha 40HP 2 Stroke

    I have a Yamaha 40HP 2 stroke that I cannot get above 4700 rpms. Its a outboard jet drive, timing is dead on, and played with, no differance, no miss fires, carbs gone through, again and again, everything OMES out good. Air screws in more or out more, same thing. One puzzle I cannot solve.
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    1993 Yamaha 40hp 2 stroke lacking RPM

    1993 Yamaha 40hp 2 stroke outboard jet drive lacking RPMs. The compression is 120lbs on all 3 cylinders, all carbs have been cleaned and checked, new fuel pump, new Boseen reeds. Mix is 50:1 But I am only getting 4780 rpm out of it, should be 5500 rpm. Timing is dead on. Any idea's as to why...
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