Re: Rubber mounting tank, engine and tensioner?
I originally tried mounting an engine with pieces of tire tube between the bike and the mounts and the tensioner and the frame, but everything wasn't secure and moved ~ even almost had a disaster with the tensioner in the spokes, so I took out all the rubber pieces. Didn't notice any difference with vibration and, oh well, the bikes are scratched. I'll just keep the engines on them.
Only place I'm able to keep rubber is under the gas tank and that's probably actually a good idea, so long as the mounts are tight..
Oh, yeah, the tensioner: just get rid of it and make your chain the correct length to begin with...