Wiseco Piston Kit for Yamaha YZ 250 2002-2025 804M06640

If you're running a Yamaha YZ 250 in competitive racing or high-performance trail riding, stock pistons won't cut it. The Wiseco 804M06640 kit delivers the strength and precision needed to handle aggressive tuning, boost horsepower, and maintain reliability through extended service intervals. This is a complete forged piston assembly engineered for riders who demand more from their engine.

Built from advanced forged aluminum with a premium high-silicon alloy composition, this piston kit handles the demands of modern 2-stroke racing. The optimized skirt design improves power delivery across the RPM range, while the E-Coat finish provides exceptional wear resistance and eliminates micro-welding concerns during high-heat operation. Installation is straightforward for experienced mechanics with proper tools.

• Forged aluminum alloy construction
• High-silicon composition
• E-Coated surface protection
• Fits 2002-2025 Yamaha YZ 250
• Includes pistons, rings, wrist pins, circlips
• Optimized skirt geometry
• Increased compression capability
• Extended service intervals
• Designed for competitive racing
• MPN: 804M06640