Wiseco WK1248 1097cc Forged Piston Kit Kawasaki 1100 ZXi STX PWC 81mm +1.00mm Overbore

The Wiseco WK1248 is a high-performance forged piston kit designed for Kawasaki 1100 ZXi and 1100 STX personal watercraft engines. This kit delivers a 1.00mm oversize bore of 81.00mm, bringing displacement to 1097cc — a proven upgrade that delivers a significant increase in overall power over the stock 80mm (1071cc) configuration.

Each piston is forged from high-silicon, low-expansion aluminum alloy, offering superior tensile strength, reduced weight, improved heat transfer, and extended service life compared to cast alternatives. Wiseco's Pro-Lite 2-stroke piston design is CNC machined to an optimal cam shape and profile, maximizing horsepower output and longevity under demanding marine conditions.

Kit Includes:

• One (1) forged aluminum piston per kit
• High-performance piston ring(s)
• Alloy wrist pin
• Circlips

Key Features:

• Forged High-Silicon Aluminum: Superior strength-to-weight ratio using aerospace-grade alloy
• 81.00mm Bore (1.00mm Oversize): 1097cc displacement for increased power output
• CNC Machined Pro-Lite Design: Optimized cam shape and profile for peak HP and service life
• Compatible Cylinder Bores: Suitable for cast iron, chrome, nikasil, and boron composite cylinder compositions
• Oversize Availability: Engineered to work with resleevable cylinders for long-term engine rebuild options
• Made in the USA: Engineered, forged, and machined in Mentor, OH

The WK1248 is the go-to piston kit for rebuilding or performance-upgrading Kawasaki 1100 ZXi and STX PWC engines. Whether restoring to running condition or chasing more on-water speed, Wiseco's forged construction and precision machining deliver the reliability and performance needed in a high-stress marine 2-stroke application.