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Engine Code: "BN157QMJ" 150cc stock, 12-Pole DC Fired, GY6 (A-Block) 54mm stud spacing longcase 20" fit 13" rear wheel, Chinese scooter model "ZNEN ZN..

GY6 Big Bore Kit 50cc / 139QMB, 1P39QMBAlso referred to as "GY6 50." The 139QMB, 1P39QMB are 49/50cc are air-cooled 4-strokes engines commonly found..