Wiseco WK1020 Kawasaki 650 Pro-Lite 2-Stroke Big Bore Piston Kit 78mm 668cc

The Wiseco WK1020 is a complete Pro-Lite forged 2-stroke big bore piston kit designed for Kawasaki 650 personal watercraft engines. This twin-cylinder kit features a 78mm overbore diameter (+2mm over standard) and upgrades engine displacement to 668cc, making it an ideal choice for performance builds and top-end rebuilds on Kawasaki 650 Jet Ski models.

Key Features:

• Forged Pro-Lite Construction: Pistons are forged from high-silicon, low-expansion aerospace-grade aluminum, delivering superior strength, reduced weight, and improved heat transfer compared to cast alternatives
• 78mm Overbore Diameter: Increases displacement to 668cc (+2mm over the standard 76mm bore) for enhanced power output
• CNC Diamond-Turned Finish: Computer-controlled machining guarantees precise sizing and a consistent finish with no size variation, compatible with cast iron, chrome, Nikasil, and boron composite cylinder bores
• Dual-Ring Design: Features a dual-ring configuration for optimized cylinder sealing and maximum ring seal pressure
• Computer-Engineered Skirt Profile: Minimizes cylinder wall friction for efficient power transfer and reduced wear
• Anti-Detonation Grooves: Ring land geometry eliminates ring blow-by while maximizing performance under demanding conditions
• Complete Kit: Includes both pistons, piston rings, wrist pins, circlips, and a complete top-end gasket set — everything needed for a full rebuild

Important Notes:

• Wiseco pistons must be used with Wiseco rings only — ring types are not interchangeable between product lines
• Crankcase machining is required for 77.5mm bore and larger installations
• Piston part number cross-reference: 549M07800

The WK1020 kit is built on Wiseco's proven Pro-Lite platform — the result of decades of 2-stroke piston development — and is engineered to deliver reliable performance for both recreational riders and competitive PWC enthusiasts.