Wiseco CK121 Top End Piston Kit CR Suzuki Hayabusa - 84mm 12 1 GSX1300R

The Wiseco CK121 is a complete top end piston kit engineered for the Suzuki GSX1300R Hayabusa. This kit delivers a 3mm overbore to 84.00mm (from the stock 81mm bore) with a 12:1 compression ratio, making it an ideal solution for high-performance engine rebuilds and big bore upgrades. Each kit includes everything needed to complete a proper top end rebuild in a single purchase.

Wiseco's CK-series kits are built around race-proven forged piston designs trusted by top racing teams across Superbike, Motocross, Supercross, and drag applications. The 4-stroke pistons feature a race-ready dome finish with smooth edges engineered for improved combustion flow and efficiency.

Key Features:

• 84.00mm bore diameter — 3.00mm oversize upgrade from stock 81mm
• 12:1 compression ratio for increased power output
• ArmorGlide skirt coating reduces friction and noise for improved horsepower
• Dedicated aerospace alloy forgings provide superior strength-to-weight ratio
• Race-ready dome finish with smooth edges for optimized combustion flow
• Horizontal slot-pin oiling reduces friction and provides scuff resistance
• Pressure seal groove for maximum ring seal
• High-performance ring kit and alloy wrist pin included for extended life and sustained power
• Complete top end gasket kit included — everything needed to finish the rebuild right

Wiseco's CK121 kit is the trusted choice for Hayabusa owners looking to increase displacement and compression without sacrificing reliability. The complete kit approach eliminates guesswork and ensures all components are properly matched for a straightforward, professional-quality top end rebuild.