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    Yamaha F20 owner, need help

    I have purchased Yamaha, 2007, F20ESH, 20hp, 4 stroke, short shaft, electric starter. S# 6AHKS100?... along with tachometer/hour combo meter p/n-ENG-METER-4C-02. After braking in at 2000RPM and 3000RPM, I have increased speed to around 5500 RPM and got noisy coming from upper part of motor...
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    2007 Yamaha F20ESH knocking at 5500rpm

    Hi to All, I have purchased 2007, Yamaha F20ESH a month ago. It is 20hp, 4 stroke, short shaft, electric starter. S# 6AHKS100?... I also purchased a tachometer/hour combo meter p/n-ENG-METER-4C-02. After braking in (1hr. at 2000RPM and 3.5hr. at 3000RPM), I have increased speed to around 5500...
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