186cc Big Bore Kit - Grom & Monkey 125 tbparts - NEW We increased the

- NEW We increased the skirt height and size on the lightweight high compression 64mm piston with rings

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186cc Big Bore Kit - Grom & Monkey 125 tbparts - NEW We increased theTB Parts 186cc Big Bore Performance Kit (64mm) TBW9150 IMPORTANT UPDATE: These bore kits are only for the 2021 and older models (will not work on the new 2022 models as the engine has been redesigned) This is the biggest Grom & Monkey 125 bore kit on the market! The all aluminum ceramic coated cylinder is lighter than a steel sleeved aluminum cylinder, reduces friction (increasing power), improves sealing, and provides better heat transfer (runs and