Wiseco PK1163 2-Stroke Top End Piston Kit 42.0mm +2.00 Overbore (653M)

The Wiseco PK1163 is a complete 2-stroke top end piston kit designed for the Yamaha PW50, featuring a 42.0mm (+2.00mm overbore) forged piston. This kit supplies everything needed to properly rebuild or overbore the top end of the engine in a single, convenient package.

Kit Includes:

• Forged high-performance piston (42.0mm / 653M bore)
• Piston ring(s)
• Wrist pin
• Circlips
• Top end gasket set

Key Features:

• USA engineered, forged, and machined in Mentor, OH — built to exacting tolerances for each specific 2-stroke powersports engine
• High-silicon aluminum alloy forging delivers improved tensile strength and superior service life over cast alternatives
• Dedicated forgings with precision lightening operations provide an optimized strength-to-weight ratio
• +2.00mm overbore (42.0mm) sizing ideal for cylinder overboring or worn bore restoration
• Wiseco-matched rings included — designed specifically to work with Wiseco forged pistons for proper seal and longevity

Wiseco has been a trusted name in 2-stroke piston manufacturing since 1941, with over 80 years of experience engineering performance pistons for powersports applications. The PK1163 kit delivers the reliability and performance that Wiseco is known for worldwide.