I've never had a Traxxas 2.5, but i've heard they are a bit finicky. Try going to smaller increments, maybe 1/12 of a turn (would be an hour on a clock). It'll be easier to find the sweet spot.

If you slowly go to full throttle, and the motor bogs down or doesn't improve RPM all the way, WHILE making good smoke, you are too rich.


If you slowly go to full throttle, and the motor bogs down, doesn't improve RPM all the way, cuts out, with no or almost no smoke, you are too lean and in danger of damaging your motor.