i run a 69/34 for blinky class with a hobbywing v3.1 speedo and killshot at 40 degrees endbell timing 5 minute run i come off at 100 degrees or less, if motor temps are too high with your setup just drop a couple teeth on pinion or go up 1 on spur i noticed someone told you to drop pinion for more top speed that is backwards a larger pinion will give you more top end and smaller spur will give you more top end