Wiseco PK1388 96mm 13.5:1 CR Forged Piston Kit for 2002-2006 Honda CRF450R

The Wiseco PK1388 is a high-performance forged piston kit designed for the 2002–2006 Honda CRF450R. Featuring a 96.00mm bore and an aggressive 13.5:1 compression ratio, this kit is engineered to deliver maximum power output for serious off-road and motocross competition. The kit includes a top-end gasket kit for a complete rebuild solution.

Why Forged?

Unlike cast pistons, Wiseco forged pistons are manufactured from high-strength aluminum billet using in-house forging tooling and processes. Forgings feature a condensed, aligned grain structure that produces superior mechanical properties, impact resistance, and fatigue life — critical qualities when operating under the extreme thermal and mechanical loads of high-performance four-stroke engines.

Key Features:

• 96.00mm bore diameter — fits Wiseco 4823M cylinder bore
• 13.5:1 compression ratio — optimized for peak power in race applications
• 100% forged in the USA using proprietary in-house forge tooling
• Skirt coating applied for reduced friction and improved wear resistance
• Designed for superior strength-to-weight ratio
• Includes matched top-end gasket kit for a complete service solution
• Developed and validated through in-house dyno testing

Wiseco's fully integrated manufacturing process — from raw bar to finished, coated piston — ensures consistent quality and performance in every kit. The PK1388 is the trusted choice for CRF450R builders looking to restore or upgrade their engine to race-ready specification.