I had not considered adding mass as primarily means to lower vibration unless needed to balance out the reciprocating mass (piston & rod assembly). Otherwise, Iíd just be creating more vibration rather than less - most likely.
Itís difficult to tell as they donít balance out counter balancers in general although they do for a Honda 250. Truthfully, Iíd spend the money to balance out every reciprocating hunk if metal in the engine if I could. Sure, it costs money, but my donated kidney means a lot mitre to me then the small amounts Iím putting into the engine. Iím not going to give up motorcycles though. Not until Iím physically incapable of riding.
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