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The Crank must be balanced and I might add "dynamically balanced" with considerations in multiple planes.
This is exactly one of the things I was asking about. You say it must be done, but who is doing it?
Nope, the new crank weighed less than the old crank and the other components (counter balance, piston, etc) where never adjusted. Thier solution was to simply add weight to the crank and they did it in a single spot.
I know the weights are being matched, but are we starting off with an unbalanced crank? and is anyone addressing that problem?