2022 Honda Grom Piston / BBK

DH Motoring Stock Bore Racing Piston (2022+ Grom / Monkey)

DHM has now produced the first high compression stock bore piston and 149cc Big Bore Kit for the new 2022 Grom/Monkey. DHM took development experience from the previous generation Grom and CRF110 to apply it to the all new Grom engine and have come up with a lightweight, high compression piston that still utilizes the OEM 12mm pin size.

DHM Stock bore 125cc kit increases compression to 13.2:1
DHM 55mm / 149cc Big Bore Kit 12.5:1 (Use OEM and supplied BBK Gasket)

TB 149cc Big Bore Kit, 55mm Forged Piston, & Cam – 2022+ Grom/Monkey

TBparts 149cc big bore kit for the 2022+ Honda Grom/Monkey 125. This will make your motorcycle a lot more fun to ride by adding some much needed power. With the larger bore, this bolt-on upgrade kit will give you more power and higher compression for a very reasonable price. This kit does not require boring of the case – simply bolt on, tune (Not included) and go!! This is an ideal option if you’re looking to add some power or you just need a new cylinder, piston, and rings to rebuild your engine. Now included with our performance cam for the best value possible!

TBparts performance camshaft for 2022+ Honda Grom, Monkey, CT125, Dax, & Cub. Ideal for use with our bore kit. Designed with more lift to open both valves up more to let more air and fuel in. More air and fuel equals more power! The cam ramp is also more aggressive to open the valves quicker to sneak even more power out! Unleash more power with this modified performance cam grind!

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
Brand new performance camshaft & cam bearings
Easy bolt-on kit
+4 HP! More gains if you have a performance Exhaust and Intake

TUNING REQUIRED!! 

• Valve Lash Settings – 0.003″ Intake/Exhaust for TB Parts camshaft