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    Yamaha f225 knocking sound

    Hi, Picked up a great '90 offshore 240 about 4 months ago, with 1100 hours on the 4 stroke yamaha on the back. It's run like a champ since I bought it for about 50 hours. On my way to a fishing spot this afternoon, at 4400 rpm, it started sounding funny and is making a bad knocking sound in...