J/30 Class Association Forums J/30 Forum The Boat, Sails and Equipment Engine mounts

I have same symptoms when my 2GM is at idle and attribute it to normal operation of the engine. I just rebuilt my Yanmar and notice lots of vibration at idle (same as before rebuild). It smoothes out as RPM is increased, and is noticiebly smoother now the engine is rebuilt. If you have similar response, I think it is "normal".