"World Traveler" wrote in message
...
No, I mean it shakes, sometimes a lot. It runs very smooth idle and at
mid-to high speed.

My '98 Merc 115 vibrated like hell between about 1100 - 1800 rpm but was
smooth at idle and above 1800. I think it's the transition from 2 to 4
cylinder operation. I just avoided that range.

-rick-