Any way it could be the latches on the cowl? My Johnny will cause the latches to buzz at a certain rpm. The solid mounts on the Merc buzz the entire boat, LOL. Someone on the board recently had a tilt pin that was rattling. If you could have someone drive the boat while you are back at the engine checking on things, it might help. Best of luck.
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1996 -19' NV Flats 115 Mercury 4-stroke
1983 -20' Wellcraft Center Console 250 XS
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