I just purchased a new Yamaha F25 a couple weeks ago and after the motor is warmed up, I get a really bad clattering/rattling sound coming from the motor while accelerating. It doesn't happen every time and it only lasts through a narrow range of RPM's at about 1/8-1/4 throttle. It actually sounds like there is a nut or bolt rattling arround inside the crankcase. Anyone have any ideas? Also, I'm only about 5 hours into the break-in period.
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