Wiseco PK1165 Pro-Lite Forged Piston Kit - 54.5mm 2-Stroke

The Wiseco PK1165 Pro-Lite Piston Kit is a high-performance forged 2-stroke piston kit with a 54.5mm bore (676M series), purpose-built for the 1992–1997 Honda CR125R. As Wiseco's flagship all-purpose 2-stroke piston line, the Pro-Lite delivers a proven combination of durability, lightweight construction, and peak power output.

Pro-Lite Series Advantages:

• Forged from aerospace-grade aluminum alloy for a superior strength-to-weight ratio over cast alternatives
• CNC-machined cam shape and skirt profile optimized for peak horsepower and extended service life
• Horizontal slot-pin oiling reduces friction and provides scuff resistance, with a pressure seal groove for maximum ring seal
• Anti-detonation grooves and precision ring land diameter eliminate ring blow-by while maximizing performance
• Extra-lightweight design for instant throttle response and faster revs
• Dedicated forgings with condensed, aligned grain structure for improved mechanical properties and resistance to impact and fatigue
• Race-proven design trusted by top teams across all forms of motorsport competition

Kit Includes:

• 1 Pro-Lite forged piston (54.5mm bore)
• 1 high-performance ring set
• 1 alloy wrist pin
• 2 circlips
• Top-end wrist pin bearing
• Complete top-end gasket kit

Note: Nikasil-bored cylinders require professional sleeving or replating when using oversized pistons. Kit covers a single cylinder only. Sold by application and bore size — confirm your standard bore measurement before ordering to ensure correct fitment.

Wiseco forges all Pro-Lite pistons in-house using proprietary tooling and validates performance through in-house dyno testing, ensuring consistent quality from raw material to finished part. Whether you're refreshing a tired top end or building for competition, the PK1165 is the trusted choice for the CR125R platform.