Koso 170cc Big Bore Kit Honda Grom MSX125

"There is no replacement for displacement."

If you love your Grom, but wish it had just a little bit more power (OK, maybe a lot more), then the 170cc Big Bore Kit from Koso might be just what the moto-pediatrician ordered. This kit includes a ceramic coated cylinder with fresh gaskets, a forged 61mm piston and everything else you'll need to bump your Grom's displacement to 170cc. 

Features:

• Increases cylinder displacement to 169.2cc
• Compression ratio: 11.5:1
• Piston size: 61mm
• Piston type: forged

Includes:

• Ceramic coated cylinder
• 61mm forged piston
• Rings
• Pin
• Gasket kit
• Banjo bolts