Wiseco CK197 Top End Piston Kit 67.50mm 13.5:1 Yamaha YZF-R6 4-Valve Big Bore

The Wiseco CK197 is a complete top end piston kit engineered for the Yamaha YZF-R6, featuring a high-compression 13.5:1 domed piston with a 67.50mm bore diameter — a 2.00mm oversize that pushes displacement to an estimated 637cc. Designed for race-ready street and track performance, this kit delivers everything needed for a full top end rebuild in a single package.

Kit Includes:

• 4x Wiseco 4854M06750 forged pistons — 67.50mm, 13.5:1 compression, domed crown with smooth edges for improved combustion flow
• 4x Wiseco 2658XA high-performance piston ring sets
• 4x Wiseco S554 16.00mm alloy wrist pins
• Circlips included
• Complete top end gasket kit (Made in the USA)
• Little end bearing (Made in Japan)

Key Features:

• Dedicated forgings utilizing aerospace-grade alloy for a superior strength-to-weight ratio
• Race-proven design, CNC machined for precision fit and tightest tolerances
• ArmorGlide skirt coating reduces friction and noise for increased horsepower and longevity
• Optimized cam shape and profile for peak horsepower and extended service life
• Precision machined from highest quality materials for sustained power output
• Engineered, forged, and machined in the USA in Mentor, OH

Wiseco's CK197 top end kit is the preferred choice of professional race teams across Superbike, Motocross, and road racing disciplines. The kit is designed specifically for the 4-valve Yamaha YZF-R6 engine and provides a complete, no-compromise solution for engine rebuilds and performance upgrades.