Wiseco PK1422 High-Compression ATV Piston Kit 103mm 11:1 CR with Top-End Gaskets

The Wiseco PK1422 is a high-performance, forged ATV piston kit engineered for 700cc four-stroke engines. Featuring a 103.00mm actual bore diameter (1.00mm oversize over the 102.00mm standard bore) and an aggressive 11.0:1 compression ratio, this kit is purpose-built to deliver increased power and durability over the factory piston. Designed for Nikasil-bored cylinders requiring bore reconditioning.

Kit Includes:

• 1 forged piston (4903M103)
• 1 ring set
• 1 chrome-plated wrist pin
• 2 circlips
• Top-end gasket kit

Key Features:

• Forged construction — significantly stronger and more impact-resistant than cast alternatives, with a refined grain structure aligned to the part geometry for maximum fatigue resistance
• ArmorGlide skirt coating — reduces friction and improves scuff resistance for longer service life
• Race-ready dome finish — optimized flame travel for efficient combustion
• Chrome-plated wrist pin with horizontal slot oiling for consistent lubrication under load
• Pressure seal groove for maximum ring seal and oil control
• Optimized strength-to-weight ratio — lightweight design without sacrificing structural integrity

Wiseco pistons are forged and finished in-house in the USA, allowing full control over every stage of the manufacturing process — from raw material to final skirt coating. All kits cover a single cylinder. Note: Wiseco rings are not interchangeable with other brands and must be used exclusively with Wiseco pistons.