This aftermarket top end rebuild kit is designed for 1998-2001 Yamaha YZ125 motorcycles. It includes pistons, gasket set, and piston rings, all made with durable materials for optimal performance. The kit is a unit type, suitable for off-road motorcycles with a 2-stroke engine type. In addition to being a high-quality replacement for worn out parts, this kit is easy to install and comes with all the necessary components. It is a vintage part, made in China, and is not intended for use as a performance part. Whether you're a professional mechanic or a DIY enthusiast, this top end rebuild kit is an ideal choice for keeping your Yamaha YZ125 running smoothly. Exact item kit is shown. New open box complete kit with additional spare gaskets, as shown. Made in China. No returns on installed items or partial sets. Piston measures 54.75mm. Exact item kit is shown. New open box complete kit with additional spare gaskets, as shown. Made in China. No returns on installed items or partial sets. Piston measures 54.75mm. Please review our business policies in our store for information regarding returns, shipping and warranties.