57mm Bore Cylinder Engine Rebuild Kit For 150cc Gy6 Chinese Scooter Parts Description 100 Brand new and high quality Durable and effective top powerAdvanced design superior performanceFits The 157QMJ GY6 150cc Chinese Scooter Engines With 57mm Bolt PatternSpecification Color like the pictureBore Size 57mm Note 1 We provide clear pictures measurements where possible Please check as much as possible to make sure the item is the one that you need 2 Please allow 0 5 1 inch difference due to manual measurement 1 inch 2 54cm 3 Instruction is not included Package Included One set as the piccture shown