QMB139 Big Bore Performance Carburetor - For GY650

Are you wanting to increase the performance and how snappy that 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, 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 a sea level altitude. You most likely will need to fine tune the carburetor. This is by far one of the best upgrade 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