I just use the spit test on my T-Maxx and any other truck i've had. If the spit dissolves sooner than about 1-2 seconds, shut it off, richen it about 1/8 turn, and let it cool at BDC before running it again. If it is about 1-2 seconds to boil the spit off, you're jsut right. Any later than 2 seconds, and you could lean it 1/16 or so.