hello and thanks for coming back. Engines are supposed to idle at 860 rpm
. Very simple cone clutch gear
boxes demand low rpm for engagement. 1150 rpm is the lowest we have achieved without this violent shaking.
Sure if we use the supplied engine
mounts ( shore 60) the engine doesn't shake. The whole boat does!! The vibration is terrible throughout all rpm range with solid mounts.
With softer shore 35 mounts we get bad vibration at idle, but only at idle. All else is smooth running. Interestingly, when gear
engaged we get terrible shaking, so we disengage. Perhaps you might think this would stop the shaking?, it doesn't. We have to increase revs in neutral to stop shaking. I thought perhaps she was over propped, but as she is a catamaran
we tried same when she was aground ( no load on prop as no water) same trouble. It seems the engine does not have enough power at idle to keep its self running properly. fuel delivery