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The lighter the rotating assembly is, the quicker it will rev up. That's what lightening pistons and crankshafts, using aluminum rods and flywheels etc. is all about.
As 28oz means a little less counterweight compared to 50oz, it might in fact have some influence.
Can anyone clearify if I can use the 5.0 crank, or if it will cause problems with the rear seal or the balancing act?
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