[Shark413]

Yeah I agree if 13T runs cool and 15T is ok, why would 14T cause temps to go high. I am thinking your on the right track on the gear mesh. The only thing that was different was the pinion and gear mesh. The buggy, spur and batteries were the same. What has me stumped is I tried the test two different times and had similar results (14T caused higher temps), I find it hard to believe I messed up the gear mesh twice and only when I tried the 14T pinion. Well, I plan on running the test a few more times.

13/45T - motor=128 degrees, battery=88 degrees
15/45T - motor=142 degrees, battery=98 degrees
14/45T - motor=176 degrees, battery=103 degrees