If you are using the stock NT Carburetor that comes with the angle fire engine kit, the jet size included in the carburetor is 0.72mm, If you want to do some upgrades with your carburetor jets, we have 3 different sets of carburetor jets that you can select from. These jets are compatible with NT carburetors, Speed, and High-Performance carburetors like the SHA 15/15 and RuTong carburetors.
BBR Tuning Fine Tuning Carburetor Jets 5 Pack .61mm .62mm .63mm .64mm .65mm
These jets are designed for riders at high altitudes and/or low temperatures (below 35°F) that require a more lean fuel mixture. This set of jets will allow your engine to run hotter than with stock jets
BBR Tuning Fine Tuning Carburetor Jets 5 Pack .66mm .67mm .68mm .69mm .70mm
These jets are designed for your average rider at level altitudes and warmer temperatures that require an even fuel mixture. This set of jets will allow your engine to run around the same temperature as your stock jets.
BBR Tuning Fine Tuning Carburetor Jets 5 Pack .71mm .72mm .73mm .74mm .75mm
These jets are designed for riders at low altitudes and/or high temperatures that require a more rich air/fuel mixture to properly run. This set of jets will allow your engine to run cooler than what your stock parts allowed.