You have to use the correct bearing size Jacek.
Raptor, I agree with Lightning, you are going to increase the pressure on the oil between the bearings if you decrease the diameter of the crank. Just like smaller diameter tires have a smaller contact patch. I would think that is a bigger possibility of squeezing the oil out than the extra speed.
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Is burning corn and stayin' warm!
My motorcycle is stock and reliable, my Talon is neither!
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