UMA racing big bore cylinder kits are plug and play ready for your machine, built to standards exceeding the manufacturers for worry free use, on the street or track. Ceramic block material will withstand higher engine temperatures. Available with forged, flat or high compression pistons.
This performance big bore kit will increase your Yamaha's displacement up to 165cc! We also recommend your to upgrade your carburetor and exhaust for best performance!
- Racing cylinder block
- Piston ring set and circlip
- Piston wrist pin
Build quaility similar to Malossi, Polini, Athena, Kawahara, etc big bore cylinder kits.