Re: vibration on alumimum boats
you need to check that you are running on ALL cylinders, you would be surprised at a 4 stroke running on 2 of 3 or just 1 cylinder. the other thing which it most likely is, is the lower unit/prop. if its slightly out of balance or tweaked it will vibrate like crazy, rubber bushings and that kind of stuff wont help. The fact that you say going slow or full throttle it stops tends to suggest this, a bad prop hub or prop shaft does exactly that too
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