Wiseco Pistons PK1189 Pro-Lite Forged Piston Kit Oversize - 2-Stroke 49.50mm 1.00mm

The Wiseco PK1189 is a Pro-Lite 2-Stroke Forged Piston Kit designed for the Kawasaki KX85, featuring a 49.50mm bore diameter at 1.00mm oversize. Part of Wiseco's flagship Pro-Lite series, this kit delivers the ideal combination of strength, lightweight construction, and all-purpose reliability — whether on the track or trail. Engineered, forged, and machined in the USA at Wiseco's Mentor, OH facility, the PK1189 is a trusted top-end rebuild solution trusted by riders at every level.

Key Features:

• Forged aluminum construction — dedicated forgings optimize strength-to-weight ratio using aerospace-grade alloy
• 49.50mm bore diameter (1.00mm oversize) with a piston diameter of 49.45mm
• CNC-machined for optimal cam shape and profile to maximize horsepower and service life
• Extra lightening operations for enhanced throttle response
• Designed for electrofusion coated cylinder bores
• Made in the USA — engineered and manufactured in Mentor, Ohio

Kit Includes:

• Forged Piston — #782M04950
• Ring Set — #1949CD
• Wrist Pin — #S517
• Circlip — #CW14
• Bearing — #B1006
• Top-End Gasket Set — #W5985

The Pro-Lite piston kit provides everything needed to complete a top-end rebuild in a single purchase. High-quality rings, wrist pin, and circlips are specifically selected to match the forged piston, ensuring proper fitment and long-lasting performance right out of the box.