Wossner Piston Kit 66.69mm Honda CR250R 1984-1985 8156D075

Stock pistons are a wear item in 2-stroke engines, and when yours fails, you lose compression, power, and reliability. The Wossner 8156D075 restores your CR250R to peak performance with a precision-forged piston kit engineered to handle the extreme combustion pressures and temperatures of competition riding. This complete kit gives you everything needed for a straightforward rebuild without compromises on durability or efficiency.

Wossner's 4032 T6 forged aluminum construction provides the strength needed for high-load 2-stroke conditions, while the proprietary skirt coating significantly reduces friction and piston rock—translating to smoother power delivery and less mechanical noise. The piston geometry was optimized using Finite Element Analysis to ensure consistent performance across the full RPM range, and the T6 heat treatment process guarantees reliability even under sustained high-temperature operation.

• Fitment: Honda CR250R 1984–1985
• Bore: 66.69mm
• Kit includes: Piston, rings, pin, clips
• Material: 4032 T6 forged aluminum
• Skirt coating: Permanent friction-reducing
• Heat treatment: T6 process
• Design method: FEA-optimized
• Installation: Bolt-on replacement
• MPN: 8156D075