Wiseco PK1827 77mm Forged Piston Kit with Top-End Gasket Kit 13.5:1 Compression

The Wiseco PK1827 is a complete top-end piston kit designed for the 2009 Kawasaki KX250F, featuring a 77mm bore and 13.5:1 compression ratio. This kit includes everything needed for a full top-end rebuild: a forged piston, high-quality piston rings, wrist pin, and circlips, along with a complete top-end gasket set.

Wiseco is unique among aftermarket piston manufacturers in that all pistons are produced strictly using the forging process, engineered and machined in-house at their facility in Mentor, Ohio. This end-to-end manufacturing control — from raw bar stock to skirt-coated finished parts — ensures every piston meets the tightest tolerances for performance and reliability.

Key Features:

• 77mm bore / 13.5:1 compression ratio — designed specifically for the KX250F engine
• Forged aluminum construction — superior tensile strength and grain structure versus cast pistons for improved impact and fatigue resistance
• Optimized strength-to-weight ratio — dedicated forging design reduces mass while maintaining structural integrity for instant throttle response
• Race-ready dome finish — smooth edges for improved combustion chamber flow on 4-stroke applications
• Armor Glide skirt coating — reduces friction and noise, contributing to increased horsepower output
• Horizontal slot-pin oiling — minimizes friction and provides scuff resistance with a pressure seal groove for maximum ring seal
• CNC diamond-turned finish — precision machining guarantees consistent sizing with no variation
• Kit includes: forged piston, ring set, wrist pin, circlips, and complete top-end gasket set
• Engineered and manufactured in the USA — Mentor, OH

Wiseco forged pistons are proven at every level of competition, from Supercross and Motocross to GNCC and beyond. Whether rebuilding after a season of hard riding or preparing for race day, the PK1827 delivers the strength, precision, and durability demanded by high-performance 4-stroke motocross engines.