Wiseco PK1632 87.5mm Forged Piston Kit 1991-2004 Kawasaki KX500

The Wiseco PK1632 is a high-performance forged piston kit designed for the 1991–2004 Kawasaki KX500, featuring an 87.5mm (575M) bore size. This kit includes a top-end gasket kit, giving you everything needed for a complete top-end rebuild in a single package.

Wiseco pistons are forged in-house in the USA, with all forge tooling also manufactured on-site. This vertical integration gives Wiseco full control over every stage of the manufacturing process—from raw billet to finished skirt-coated parts—ensuring consistent quality and precision in every unit.

Key Features:

• 87.5mm (575M) bore diameter — fits 1991–2004 Kawasaki KX500
• Forged construction — superior strength and fatigue resistance versus cast alternatives
• In-house USA manufacturing — raw bar to finished part, fully quality controlled
• Skirt coating — reduces friction and improves break-in characteristics
• Includes top-end gasket kit — complete rebuild solution in one package
• Optimized strength-to-weight ratio — engineered for 2-stroke high-performance motorsport use
• Condensed, aligned grain structure — provides higher mechanical properties and impact/fatigue resistance compared to cast pistons

Wiseco's in-house dyno testing and R&D program drives continuous development in piston shapes, coatings, and components. The result is a piston engineered to withstand the extreme demands of competitive off-road and motocross racing. The PK1632 is a direct-fit replacement that delivers OEM-level reliability with race-proven performance.