Wiseco 4394M06600 Forged Piston Kit CR - 4-Stroke 66.00mm 10.25 1

The Wiseco 4394M06600 is a 4-Stroke Forged Series Piston Kit featuring a 66.00mm bore and 10.25:1 compression ratio, purpose-built for Honda 200cc powersports applications. This is a 1.00mm oversize piston designed for use in engines that have been bored out to the 66mm specification.

Wiseco engineers and manufactures this piston entirely in the USA, using dedicated forgings crafted from high-silicon, low-expansion aluminum alloy. Unlike cast pistons, Wiseco's forged construction produces a condensed, aligned grain structure that delivers significantly higher mechanical strength, superior resistance to impact fatigue, and an optimized strength-to-weight ratio — qualities that make it the preferred choice under demanding motorsport conditions.

Key Features:

• 66.00mm bore — 1.00mm oversize for rebored cylinders
• 10.25:1 compression ratio for strong, reliable 4-stroke performance
• Dedicated forging — engineered and forged in-house in Mentor, OH, USA
• Forged aluminum construction — superior tensile strength vs. cast pistons
• Optimized strength-to-weight ratio via application-specific forging design
• Built to tight tolerances for the ultimate combination of performance and longevity
• Kit includes: piston, high-quality piston rings, wrist pin, and circlips

Wiseco's 4-stroke forged piston kits are proven across every level of riding, from recreational trail use to competitive racing. With over 70 years of piston engineering expertise, Wiseco delivers a complete, ready-to-install kit that restores and enhances engine performance in worn or performance-built Honda 200cc powerplants.