Wiseco 4609M07300 Forged Piston Kit Honda Bore CR - CBR900RR 73.00mm 12 1

The Wiseco 4609M07300 is a forged performance piston kit designed for the Honda CBR900RR (1996–1999). This kit features a 73.00mm bore diameter (2.00mm oversize) and a 12:1 compression ratio, making it an excellent choice for high-performance engine rebuilds and overbore applications.

Kit Includes:

• Forged high-silicon, low-expansion aluminum piston
• Piston rings (ring set 2874XA)
• Wrist pin (17.00mm x 43.00mm)
• Circlips

Key Features:

• Forged aluminum construction — high-silicon, low-expansion alloy delivers superior strength, reduced weight, and improved heat transfer compared to cast pistons
• 12:1 compression ratio — optimized for maximum power output in performance and race applications
• 73.00mm bore diameter — 2.00mm oversize for use with a bored or sleeved cylinder
• CNC diamond-turned finish — precision machined to exact tolerances for consistent sizing and optimal ring seal
• USA engineered and manufactured — designed and forged in Mentor, OH to exacting powersports standards
• Compatible with cast iron, chrome, Nikasil, and boron composite cylinder bore compositions

Note: This is an oversize piston. Use with a properly bored or resleeved cylinder only. Cylinder sleeving is required for Nikasil and chrome-lined cylinders when using oversize pistons.