Tycho,


Please do a search on RCUniverse for engine balancing.

There are several threads about this subject, in which I participated.


The point is a single cylinder engine cannot be balanced (unless you want contra-rotating balance shafts, Etc....).

The aim of balancing in this case is to minimize the vibrations, not to cancel them out.
It is a trade-off between up-and-down and side-to-side vibrations.

When one is zero, the other is maximized and vice-versa.

There is no reason your Evo should vibrate more than the next guy's engine.
Just mount it as solidly as you can.

Using non-nylock locking nuts should solve your problem too and lock-tite only works if there is absolutely no oil, on both the nut and the bolt.
Both must be bone dry, or it will just vibrate loose all over again.