Wiseco WK1026 Kawasaki JS300 Pro-Lite Forged Piston 76mm 549M

The Wiseco WK1026 is a Pro-Lite forged piston designed for Kawasaki JS300 personal watercraft through 1994, featuring a 76mm bore diameter (549M). Built from high-silicon, low-expansion aluminum alloy, this piston delivers superior strength, reduced reciprocating weight, and improved heat transfer compared to cast alternatives — making it an ideal upgrade for both performance riders and recreational enthusiasts.

Key Features:

• Forged Pro-Lite Construction: High-silicon, low-expansion aluminum alloy provides exceptional strength-to-weight ratio and extended service life
• Diamond-Turned Finish: CNC-machined on precision turning centers for consistent sizing and a perfect surface finish with zero variation
• Universal Cylinder Compatibility: Engineered to run in cast iron, chrome, Nikasil, and boron composite cylinder bore compositions
• Oversize Availability: Part of Wiseco's broad oversize piston lineup to restore worn cast iron cylinders; chrome, Nikasil, and boron composite cylinders can be re-sleeved to accept oversizes
• 76mm Bore / 549M: Precisely sized to OEM spec for direct fitment on JS300 applications through model year 1994
• Computerized Manufacturing: Produced in a state-of-the-art CNC facility dedicated to consistent tolerances for both racing and recreational use

Wiseco's Pro-Lite series pistons are a trusted choice in the powersports and marine industries, offering a bolt-in performance upgrade that extends engine longevity and supports reliable power delivery in demanding two-stroke applications.