Just a point about engine vibration. When an engine is designed, it has a probable RPM range that it is intended to run at. The engineers strive to have minimal vibration at this rpm range. However, we are going way outside of that range in RPMs. Also, when you also throw in a larger piston, it also throws the intended balance range out the window. On just about all engines, when you go a larger piston size, you get more vibration. What you can try is to weigh a stock piston, then weigh the BB then see if you can lighten up the BB with minimal grinding. If we were playing with twins, it would be easier to counterbalance. That being said, a germ of an idea can lead to some pretty good results.
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