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Knife-edging will reduce the counterweights on the crank. If the same amount is removed on each one, and the crank re-balanced it won't vibrate more nor significantly increase engine noise but because the reciprocating masses (pistons, rods) are not necessarily lighter when upgraded from cast to forged, stress (and therefore, wear) on the crank and rod bearings will increase with the corresponding effect on engine longevity.
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