Engine Cases (Pair, Long, Big Bore, Custom); GY6

Scooterworks offers our exclusive pair of Custom Big Bore Engine Cases for GY6 long engines. We machine these in matched pairs ourselves, and we bore them up to 63mm, big enough to fit a 63mm performance cylinder kit . Go big! Pick up a new crankcase gasket while you're at it. Specifications: Matched right and left sides Stamped serial numbers ensure you have a matched set Dimensions: 10"L x 10"W x 4"H Compatibility: 157QMJ-based 125cc / 150cc / 169cc engines with the following engine codes: 157QMJ 161QMK 152QMI 1P61QMK YN1P57QMJ 1P52FMI 154FMI JJ157QMJ 1P57QMJ BN157QMJ BN161QMK-A Other QMJ, QMK, and QMI models Don't see your engine listed? If the engine code includes "QM" or "FM", this product is compatible with your vehicle. About Scooterworks: Since our beginning in 1989, Scooterworks has become a major supplier of parts and accessories for vintage and modern scooters. We have everything you need, from wear-and-tear items like tires and oil filters to aftermarket parts from brands like Malossi, NCY, Prima, YSS, Dr. Pulley, and more. This product is intended for off-road use only. This product is not intended for use on public roads or land. This product is not legal for use in California on pollution-controlled vehicles. Check local laws before installing. *Performance upgrades are considered racing parts and are not covered by warranty.