Wiseco Piston Kit with Gaskets, 66.40 mm for Yamaha YZ250/X (PK1198)

Upgrade the top end of your Yamaha YZ250 or YZ250X with the Wiseco PK1198 Piston Kit with Gaskets. Designed as a complete piston solution for one engine, this kit includes the essential components needed for a reliable piston replacement, including pistons, piston rings, wrist pins, circlips, and a top-end gasket kit. The 66.40 mm piston size provides a precise fit for compatible applications and supports dependable engine performance.
Wiseco pistons are engineered to work exclusively with Wiseco piston rings. For proper fitment and performance, use the ring type specified for the piston and application. Wiseco ring types are not interchangeable; for example, CD rings cannot be substituted for LC rings. Always verify the required ring configuration before installation and follow the manufacturer’s service procedures for piston clearance, ring placement, and assembly.
This Wiseco PK1198 kit is intended for Yamaha YZ250 and YZ250X applications requiring the specified piston size. Cylinder sleeves are not included and must be purchased separately when needed. Confirm the motorcycle model, engine specifications, piston clearance, and required ring type before ordering or installation. With its matched piston, ring, wrist pin, circlips, and gasket components, this kit provides a convenient foundation for complete top-end service.

Features:

• Complete top-end kit: Includes pistons, rings, wrist pins, circlips, and a top-end gasket kit for one complete engine

• Piston size: 66.40 mm piston designed for compatible Yamaha YZ250 and YZ250X applications

• Matched components: Wiseco pistons must be fitted with Wiseco rings for proper compatibility

• Ring compatibility: Wiseco ring types are not interchangeable, including CD and LC configurations

• Cylinder sleeve requirement: Cylinder sleeves are not included and must be purchased separately

Ships from Parts Unlimited.