Originally Posted by fatdaddy
Rubber mounting actually increases vibration, It leaves a little wiggle room for the engine to move. Try it without the "vibration reducing materials". Just make sure the engine is tight. I started getting that kind of buzzing in my (blank, blank,) parts, snugged the engine, no more vibes. I used to build with rubber mounting, It doesn't really work.
I don't even think full blown motorcycles have rubber mounts on them for the same reason.