Wossner Piston Kit 66.50 mm for Honda CR250R 1997-2001 8156D050

When you're rebuilding a CR250R engine, piston quality directly impacts throttle response, reliability, and how long your engine stays in the game. The Wossner 8156D050 delivers the precision engineering you need to restore—or exceed—factory performance without compromise. This complete kit handles the critical components in one package, so you can focus on getting your two-stroke back on the track.

Built from 4032 T6 forged aluminum, this piston withstands the extreme combustion pressures and temperatures a CR250R generates. The permanent skirt coating reduces friction and piston rock, translating to smoother acceleration and quieter operation. T6 heat treatment strengthens the material against thermal cycling, ensuring durability through countless race sessions or trail rides.

Wossner used Finite Element Analysis during development to optimize ring seating, crown geometry, and skirt design—every dimension matters. This kit includes the piston, rings, wrist pin, and circlips, so installation is straightforward for anyone comfortable with basic engine work.

• Fits: Honda CR250R 1997–2001
• Bore: 66.50 mm
• Material: 4032 T6 forged aluminum
• Heat treatment: T6 process
• Skirt coating: Permanent friction-reducing
• Kit contents: Piston, rings, pin, clips
• Design method: FEA-optimized
• Installation: Bolt-on rebuild