Wiseco Pistons PK1630 Top End Piston Kit Kawasaki - 2-Stroke 86.50mm KX500 1991-2004

The Wiseco PK1630 is a 2-stroke forged top end piston kit designed for the 1991–2004 Kawasaki KX500. Featuring an 86.50mm (+0.50mm oversize) bore, this kit delivers the strength, precision, and reliability demanded by serious motocross and off-road competitors. Wiseco has been the industry leader in 2-stroke piston manufacturing since 1941, and every PK1630 kit is engineered, forged, and machined in the USA at their Mentor, Ohio facility.

Pro-Lite Forged Piston Technology:

• Pro-Lite forged construction — CNC machined for optimal cam shape and profile, maximizing horsepower output and service life
• Aerospace-grade alloy — dedicated forgings provide superior strength-to-weight ratio over cast alternatives
• Improved tensile strength — forged grain structure resists impact and fatigue under extreme racing conditions
• Horizontal slot-pin oiling — reduces friction and provides scuff resistance for long-term durability
• Pressure seal groove — ensures maximum ring seal and consistent compression
• Designed for each specific engine — engineered specifically for the KX500 2-stroke powerplant, not a universal fit

Kit Includes:

• Forged 86.50mm Pro-Lite piston
• High-performance piston ring(s)
• Alloy wrist pin
• Circlips
• Complete top end gasket kit

The PK1630 is the go-to choice for KX500 rebuilds requiring an overbore to 86.50mm. Whether you're rebuilding after a season of hard racing or refreshing a high-hour engine, Wiseco's proven top end kit gets you back on the track with confidence.