QMB139 GY650 Big Bore Performance Carburetor

⚠️ NOTE: We are temporarily out of the CNC intake manifolds, and this carburetor will instead come with a cast intake, shown in the picture below. This is not a permanent change, and will be reverted once we receive more CNC intakes. The current price reflects this temporary change. ⚠️

Are you wanting to increase performance and improve how snappy your throttle is? Look no further! This QMB139 (GY6 50cc engine with big bore) carburetor kit comes with a round slide carburetor, Uni pod air filter, large ported intake manifold, throttle cable and jets! Not to mention, this is all put together! This is a drop in kit! We send the carburetor out with a base tune for sea level altitude. You most likely will need to fine tune the carburetor. This is by far one of the best upgrades you can add to your 80cc - 100cc GY6 big bore kit.

WE RECOMMEND PORT MATCHING THE HEAD TO THE INTAKE FOR A SMOOTH TRANSFER OF AIR.

Installed Jet:

Pilot: 38
Main: 135

If you want to take the guess work out of any tuning you may need to do, check out our Wide Band O2 Sensor.

EXTRA PILOT JETS INCLUDED:

32, 35, 38, 40, 42, 45, 48, 50, 52, 55

EXTRA MAIN JETS INCLUDED:

100, 105, 108, 110, 115, 120, 125, 130, 135, 140