This Carburetor Fit For All Traxxas vehicles with 2.5, 2.5r or 3.3 engines The 4910 2.5 T-maxx and 4907 3.3 T-maxx use the exact same carburetor. In case you need them, standard carb settings are 4 out from flush on the high speed and 1/2 turn out from flush on the low speed...