Koso 61mm Forged Piston Kit – Honda Grom & Monkey

Koso 61mm Forged Piston Kit (MD623000) for the Honda Grom and Monkey 170cc Big Bore Kit. Includes piston, pin, cir clips and rings.

*Please note: Compatible with 2014-2021 Honda Grom

• Piston Diameter: 61mm
• Piston Type: Forged
• Compression Ratio: 11.5 to 1
• Piston Compression Height: 19.5mm