flywheel question

Does anyone know how much heavier the WR flywheels are over the YZ flywheels? I have a WR flywheel that I am using in my YZ426 and was wondering exactly how many ounces over stock it is? I was thinking of putting it on a lathe to shave it down a little to have the performance of the YZ flywheel with the light output of the WR flywheel.

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