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CG Engine Ratio 150cc: Clutch ring gear 73 teeth, oil pump 39 teeth, crankshaft pinion 18 teeth CG Engine Ratio 200cc: Clutch ring gear 70 teeth, oil pump 37 teeth, crankshaft pinion 21 teeth Remember to consider the change with the 42-tooth sprocket and the 17-tooth output shaft pinion in the drive kit