Well this fit my monster moto mm-b80 mimi bike 2.5 engain
While we have not confirmed compatibility with that exact model, it may be a compatible option. We would recommend reviewing the specifications and comparing them to the fuel cap on your unit. Here are the specifications:
Inside Diameter: 1-1/4" (32.5 mm)
Outside Diameter: 1-3/4" (44.7 mm)
Thread Pitch: 8 (1/8" distance between threads)
We also have another fuel cap option linked to 80cc units, you can find that cap here: https://www.monsterscooterparts.com/off-road-atv-parts/atv-categories/fuel-tanks-caps-off-road/improved-chrome-gas-cap-fuel-cap-for-80cc-97cc-2-8-hp-163cc-5-5-hp-196cc-6-5-hp-engines.html