Originally Posted by
Fred_B
Some times the motor will run hot if it's revving out all the time. In that case running a bigger pinion can actually make the motor run cooler. The sweet spot gets smaller as you add timing.
Just goes to show that you need to practice with a few different ratio's and find the best gear for what you're running.
+1 Its finding that sweet spot for each motor that is a pain. On the revving out thing though, usually when a motor runs at full RPM instead of constantly pulling more load to accelerate I've found them to run cooler. Again, it all depends on that particular motor. I've had none, zero, no heat problems with my RS and 7.5 in my Losi truck.