Wiseco K823 Honda CB750 4-Valve 65mm Forged Top End Piston Kit 10.25:1 CR

The Wiseco K823 is a complete forged top end piston kit designed for the Honda CB750 4-valve DOHC engine. Bored to 65.00mm (3.00mm oversize), this kit delivers an 823cc displacement at a 10.25:1 compression ratio, making it an ideal solution for top end rebuilds and performance overhaul applications. Note: cylinder boring is required for installation.

Kit Contents:

• Forged aluminum piston — Part No. 4183M06500 — race-ready dome finish with smooth edges for improved combustion flow
• Ring set — Part No. 2559XC — 65.00mm high-performance XC ring set
• Piston pin — Part No. S522 — 15mm x 2.205in.
• Round wire pin locks (circlips) — Part No. CW15 — 15mm, sold as a pair
• Head gasket — Part No. W3932 — CFM-20 non-chromed top end gasket

Forged Construction & Engineering:

• Forged from high-silicon, low-expansion aerospace aluminum alloy for a superior strength-to-weight ratio, improved heat transfer, and extended service life
• ArmorGlide skirt coating reduces friction and operating noise, contributing to measurable horsepower gains
• CNC diamond-turned finish ensures precise bore sizing with no dimensional variation
• Compatible with cast iron, chrome, Nikasil, and boron composite cylinder bore compositions
• Stroke length: 62.00mm

Wiseco's K823 top end piston kit provides everything needed to complete a proper rebuild on the Honda CB750 4-valve DOHC platform, combining over 60 years of American-made forging expertise with proven race-derived technology.