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Metallurgically, the billet rod is substantially better than a cast stock rod and is actually heavier. As for your balancing concerns we are dealing with a single cylinder 4 cycle engine, vibration is simply a fact of life. Static or rotational you can only balance at one RPM setting anyway. Balancing a single does not reduce vibrational amplitude just its vector. And that is a guess.
The Animal was designed for racing RPM's, in stock rules racing there are no aftermarket parts that will substantial upset this engine.
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