Wiseco 4766M08550 Forged Piston Kit Bore CR - 85.50mm 13.5 1 4-Stroke

The Wiseco 4766M08550 is a 4-Stroke Forged Series Piston Kit designed for the Kawasaki ZX12R (2000–2005). Featuring an 85.50mm bore (2.50mm oversize) and a high-compression 13.5:1 compression ratio, this kit is engineered to deliver increased power output and top-end performance over the stock configuration.

Key Features:

• Forged aluminum construction — engineered and manufactured in the USA in Mentor, OH using aerospace-grade aluminum for superior strength and durability
• 85.50mm bore diameter — 2.50mm oversize for engines requiring a rebore
• 13.5:1 high compression ratio — maximizes combustion efficiency and power output
• Dedicated forging design — optimized strength-to-weight ratio specific to this engine application
• Improved tensile strength — forging process aligns grain flow of the alloy for resistance to impact and fatigue
• Complete kit — includes high-quality piston rings, wrist pin(s), and circlips for a one-stop rebuild solution
• Tight manufacturing tolerances — designed for the ultimate combination of performance and long service life

Wiseco's forging process compresses the aluminum's molecular structure, increasing density and aligning the grain flow — resulting in a piston that outperforms cast alternatives in strength, ductility, and fatigue resistance. Each piston is precision-machined using the latest 3D design techniques and finite element modeling to ensure optimal fit and function for this specific application.