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

PLEASE NOTE: 2002 Models will not be able to use the auto clutch removal washer as well as not being able to use a primary gear

TBW0294 - Main jet kit

- Lightweight high compression domed 67mm piston with rings

91-94 CT70

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