Wiseco PK1880 Top End Piston Kit 77mm 14.5:1 High Compression ArmorGlide 4-Stroke

The Wiseco PK1880 is a complete top end piston kit designed for the Kawasaki KX250F, featuring a high-compression 14.5:1 ratio and a 77mm (standard) bore. This kit includes everything needed for a top end rebuild or overbore in a single, race-ready package.

The forged piston is manufactured from high-silicon, low-expansion aluminum alloy, delivering superior strength, reduced weight, improved heat transfer, and extended service life compared to cast alternatives. Dedicated forgings allow for an optimized strength-to-weight ratio, and the piston features a race-ready dome finish with smooth edges engineered to improve combustion flow.

Key Features:

• ArmorGlide skirt coating reduces friction and noise, allows tighter piston-to-bore fit for improved ring seal, and contributes to increased horsepower
• Forged 4-stroke piston designed specifically for this engine application and built to tight tolerances for performance and durability
• 14.5:1 high compression ratio — requires increased octane (race fuel)
• 77mm bore diameter — standard bore sizing (piston number 40020M)
• Race-ready dome finish with smooth edges for optimized combustion flow
• Horizontal slot-pin oiling reduces friction and provides scuff resistance with a pressure seal groove for maximum ring seal
• Engineered, forged, and machined in the USA (Mentor, OH)

Kit Includes:

• Forged piston
• High-performance piston ring set
• Alloy wrist pin
• Circlips
• Complete top end gasket set

Built from race-proven designs trusted by top Supercross and Motocross race teams, the PK1880 delivers the power, reliability, and longevity demanded by serious off-road competition. Note: compression ratio of 14.5:1 requires race fuel with increased octane.