Wiseco Pistons PK1331 Pro-Lite Top End Piston Kit Standard Bore - 2-Stroke 67.00mm

The Wiseco PK1331 Pro-Lite Top End Kit is a complete 2-stroke top end rebuild solution delivering forged piston performance in a standard 67.00mm (642M) bore. Designed for serious dirt bike riders and racers, this kit contains everything needed to restore and upgrade the top end with quality components that meet or exceed OEM standards.

What's Included:

• Forged Pro-Lite Piston – CNC machined from aerospace-grade alloy for an optimal cam shape and profile, maximizing peak power output and service life
• High-Performance Ring Set – Anti-detonation grooves and precision ring land diameter eliminate ring blow-by for sustained power and extended service life
• Alloy Wrist Pin – Precision-machined for consistent fit, strength, and reduced friction; horizontal slot-pin oiling provides scuff resistance and a pressure seal groove for maximum ring seal
• Circlips – Included for a complete, ready-to-install assembly
• Top End Gasket Kit – Premium materials engineered to deliver superior sealing technology that exceeds OEM standards
• Premium Needle Bearing – High-quality replacement wrist pin bearing built to withstand the demands of high-performance and racing applications

Pro-Lite Forged Piston Technology:

• Extra lightweight piston design for instant throttle response
• Computer-engineered skirt profile minimizes cylinder wall friction
• Superior strength-to-weight ratio utilizing aerospace alloy construction
• Dedicated forgings with condensed, aligned grain structure for higher mechanical properties and resistance to impact and fatigue
• Race-ready dome finish with smooth edges for improved combustion flow
• Race-proven designs chosen by top teams in Supercross, Motocross, and GNCC competition

Wiseco forges all pistons in-house in the USA, controlling every stage of production from raw material to finished skirt coating. All rings, wrist pins, and circlips are manufactured to Wiseco's strict quality standards. Note: Wiseco rings are not interchangeable with other brands — only Wiseco rings should be used with Wiseco pistons. Alternate/OEM part number: 09030241.