Wiseco PK1922 Top End Piston Kit Yamaha - 4-Stroke WR250F 13.5 1

The Wiseco PK1922 is a complete 4-stroke top end piston kit designed for the Yamaha WR250F, featuring a 13.5:1 compression ratio at standard bore. This kit delivers everything needed for a professional-grade top end rebuild in a single convenient package.

Wiseco has been engineering performance pistons in Mentor, OH since 1941, and the PK1922 reflects decades of precision manufacturing expertise. Each forged piston is designed to the tightest tolerances, optimizing the combination of performance, strength, and service life for your specific engine application.

Kit Includes:

• Forged performance piston
• Piston ring(s)
• Wrist pin
• Circlips
• Top end gasket set

Key Features:

• Forged aluminum construction — improved tensile strength over cast alternatives for extended service life
• Engine-specific design — dedicated forgings built and matched precisely to the Yamaha WR250F application
• Optimized strength-to-weight ratio — lightening operations reduce reciprocating mass for improved throttle response
• 13.5:1 compression ratio — high-performance specification for maximum power output
• Engineered, forged, and machined in the USA — manufactured in Mentor, OH
• One-stop rebuild solution — all critical top end components included and matched for compatibility

The Wiseco PK1922 is the trusted choice for riders and technicians who demand precision-engineered components for their top end rebuilds. All kit components are hand-selected by Wiseco engineers to ensure seamless fitment and long-term reliability.