Model Name: YX140 56mm Bore Engine Barrel Cylinder Body Pin Pistons Rings Kit Bore Size: 56mm Material: Metal construction Compatibility: Designed for YX140, YX 140cc, and YCF 150cc Thumpstar Quad Bike ATV Four Wheels Moto This engine kit includes multiple configuration options to suit different rebuild needs.Option A provides a 56mm bore cylinder.Option B includes a 56mm bore cylinder, 56mm piston, 13mm gudgeon pin, and compression ring.Option C contains a 56mm piston, 13mm gudgeon pin, and compression ring.The components are engineered to enhance engine power and improve operational smoothness.The cylinder and piston assembly is built to withstand -temperature conditions, supporting function during off-road use.Designed for straightforward installation, the kit fits directly into compatible engine systems without requiring specialized tools or modifications.Constructed to meet standard manufacturing specifications, the parts support and consistent in various riding conditions.This makes the kit suitable for routine engine maintenance or function on applicable quad bikes and ATVs.Important: This product is an aftermarket alternative.Brand names mentioned serve only to show which devices it fits.