Description
Unlock more power and performance with the TBparts 149cc Big Bore Kit & Injector for your 2022+ Honda Grom or Monkey 125. This bolt-on upgrade significantly boosts power and compression, delivering a more exciting ride at an affordable price.
Designed for easy installation, this kit requires no boring of the engine case—just bolt it on, tune (tuning not included), and hit the road! Whether you’re looking to enhance performance or need a fresh cylinder, piston, and rings for a rebuild, this kit is a solid choice for riders seeking a reliable power boost.
Key features:
- High quality, Forged, high compression 55mm piston, with rings, pin, & clips
- 11.8:1 compression ratio compared to Stock 10:1. Our 11.8:1 piston is pump 91+ octane gas friendly.
- Aluminum cylinder with steel sleeve (55mm)
- Head gasket kit with exhaust gasket!
- Fits all 2022+ Honda Grom/Monkey 125
- Largest bore you can go without boring the cases
- More power and fun at an affordable price
- Clearance to retain factory piston oil squirter
- Easy bolt-on kit
- +4 HP! More gains if you have a performance Exhaust and Intake
- includes Honda PCX150 injector. Larger than stock injector for use with all Honda Grom and Monkey 125. Tuning required