Wiseco WK1090 Pro-Lite Forged Piston Top-End Kit 83mm for Kawasaki 750 PWC

The Wiseco WK1090 is a complete Pro-Lite top-end piston kit designed for 1992–1995 Kawasaki 750 personal watercraft engines. Built around the 813M series piston at 83mm bore (+3.00mm oversize), this kit bumps displacement to approximately 795cc, making it a popular choice for engine rebuilds and performance upgrades alike. Each kit is precision-forged and CNC-machined in the USA.

Kit Includes:

• Pro-Lite forged piston (83mm / 813M series)
• Piston rings
• Chromoly wrist pin (20mm)
• Circlips / pin retaining clips
• Top-end cylinder gasket set

Key Features:

• USA-Forged 4032 Alloy Construction: Precision-forged from high-silicon aerospace aluminum alloy for superior tensile strength, excellent heat resistance, and improved detonation control
• Pro-Lite Series Engineering: Dedicated forgings with additional CNC lightening operations deliver an optimized strength-to-weight ratio for quicker throttle response and extended service life
• CNC Diamond-Turned Finish: Machined to tight tolerances for consistent bore sizing and a precise fit in cast iron, chrome, nikasil, and boron composite cylinder compositions
• Complete Top-End Kit: Includes all hardware needed for a full top-end rebuild in a single part number — no separate gasket kit required
• Oversize Bore (+3.00mm): Designed for cylinders bored to 83mm, accommodating standard wear and restoring factory-spec compression and sealing

The WK1090 is engineered and manufactured at Wiseco's facility in Mentor, Ohio, continuing the brand's 80+ year legacy in 2-stroke piston development. Compatible with cylinders bored to 83mm using cast iron liners or resleeved chrome, nikasil, or boron composite bores.