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If you are increasing capacity, you obviously want more power without increasing increasing the rev limit. The stock balance factor is designed to make the motor run smooth at low and medium revs. If you don't raise the balance factor - due to heavier pistons, you might get more vibration in the low and medium rev range, but raising the balance factor without drilling the journal side of the cast iron flywheel is not easy. You need to add weight to the opposite side. I tapped the balance hole which is there in the 850 crank, and fitted a steel plug. But it is not foolproof or failsafe.You might be able to mill a scallop into both sides of the rim of the flywheel, above the journals. You would need to be careful to avoid creating stress-raisers.
If you are increasing capacity, you obviously want more power without increasing increasing the rev limit. The stock balance factor is designed to make the motor run smooth at low and medium revs. If you don't raise the balance factor - due to heavier pistons, you might get more vibration in the low and medium rev range, but raising the balance factor without drilling the journal side of the cast iron flywheel is not easy. You need to add weight to the opposite side. I tapped the balance hole which is there in the 850 crank, and fitted a steel plug. But it is not foolproof or failsafe.
You might be able to mill a scallop into both sides of the rim of the flywheel, above the journals. You would need to be careful to avoid creating stress-raisers.
