Wiseco REP829M08100 Racer Elite Pro 4-Stroke Piston Kit 81mm Bore 14.5:1 CR

The Wiseco REP829M08100 Racer Elite Pro Piston Kit is a high-performance forged piston kit engineered for KTM 250 SX-F and Husqvarna FC250 4-stroke motocross engines (2023–2024). Built with an 81.00mm bore diameter and a 14.5:1 compression ratio, this kit is purpose-built for riders demanding maximum power output and race-ready reliability.

Racer Elite Pro Series Technology:

• Aerospace-grade forged aluminum construction — the forging process compresses material molecules, aligning grain flow for superior strength, impact resistance, and fatigue resistance compared to cast alternatives
• 14.5:1 high-compression design — optimized for peak power delivery in competitive 250cc 4-stroke racing applications
• 81.00mm bore diameter — precision-machined to exact tolerances for optimal cylinder seal and long service life
• Computer-engineered piston skirt profiles — minimize cylinder wall friction for improved efficiency and instant throttle response
• Anti-detonation grooves and optimized ring land profiles — eliminate ring blow-by and maximize engine performance
• Complete kit — includes piston, rings, wrist pin, and circlips for a straightforward top-end rebuild
• Engineered, forged, and machined in the USA — manufactured at Wiseco's facility in Mentor, OH

Wiseco is the only aftermarket piston manufacturer in the United States that produces pistons exclusively through the forging process, resulting in a product with higher mechanical properties, improved ductility, and greater resistance to the extreme stresses of high-performance racing. The Racer Elite Pro series represents Wiseco's flagship offering for serious motocross and off-road competitors.