You have a Traxxas motor correct?Lsn should be flush with the collar,adjust high speed till you get it right.Best thing you can do with a 2.5,2.5r or 3.3 is to get a Ofna force 26 carb.It's alot better carb and will hold it's tune unlike the stock junk traxxas carb.Your running good fuel so thats not a problem.Look on the bay for the 26 carb.