Thankyou for the replies, but i want to race off road and the 2.5 is too much for my track. besides if i run other tracks and they run ROAR or RC Pro rules i couldn't race it. I found the correct carb on tower's site, but i'm going to try something different and try a Traxxas carb, i had to cut off about 1/16 off the end but it fits great. Just need to find a good place to start, probably close to traxxas's starting setup.