Wiseco CK175 Forged Top End Piston Kit 68mm 12.9:1 Kawasaki ZX6R 636cc

The Wiseco CK175 is a complete forged top end piston kit engineered for the Kawasaki ZX6R Ninja, delivering a 68.0mm bore and a high 12.9:1 compression ratio for a total displacement of 636cc. Designed for both performance riders and competitive racers, this kit provides a direct upgrade over OEM cast pistons with aerospace-grade materials and precision manufacturing.

Key Features:

• Aerospace Forged Construction: Each piston is forged from high-silicon, low-expansion aluminum alloy — the same process used in aerospace applications — compressing the material's molecular structure for superior strength, reduced weight, improved heat transfer, and longer service life compared to cast alternatives
• 68.0mm Bore / 12.9:1 Compression Ratio: Standard bore sizing with a high-performance compression ratio optimized for maximum power output on the ZX6R 636cc platform
• Moly-Coated Skirt: The piston skirt features a molybdenum coating to reduce friction, minimize wear, and aid break-in during initial engine operation
• CNC Diamond-Turned Finish: Each piston is diamond-turned on CNC machining centers for a precise, consistent finish with zero size variation — compatible with cast iron, chrome, Nikasil, and boron composite cylinder bore compositions
• Optimized Dome Design: The piston dome is engineered for improved flame travel, while the detailed skirt profile ensures stability and smooth operation throughout the rpm range
• Proper Installed Clearance: Every Wiseco piston is designed with application-specific installed clearance to maximize power, minimize wear, and ensure the best ring seal at operating temperature
• Complete Kit Contents: Includes 4 pistons, piston rings, wrist pins, circlips, and head gasket — everything needed for a full top end rebuild

Wiseco is the only aftermarket piston manufacturer in the United States that produces pistons exclusively through the forging process, making the CK175 a trusted choice for street performance and drag racing builds on the Kawasaki ZX6R Ninja (2003–2005).