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  1. Buzzing at c.a. 6800 rpm

    Ninja 400 Complaints, Issues And Problems
    Hi All, I have recently noticed that my Ninja 400 has developed a buzzing sound at 6800rpm. The sound comes on at these revs and diseappers when the revs rise or fall below this value. It appears on both acceleration and deceleration when pasing 6800 rpm. Appears to be engine vibration and not...