vibration

We moved our recently purchased “SV- Genesis” C380 hull #143 to our home port this week. The boat ran fine for about 4 hours trip at the recommended 2,500 rpm. However, as we approached port a strong vibration developed. Lowering the engine speed to around 1,500 rpm stopped the vibration.

I looked at the engine mounts and all look tight and normal.

Any suggestions?

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