[Overdriven]

The 1518 and 1520 I mentioned are Castle motors, and yes they are 4 pole. They are both discontinued by Castle, but the specs are still up on their site and you can find the motors in Mike's store still. 4 pole motors generally have more torque than similar size 2 pole motors and are more efficient, so yes they generally run cooler and hold up better.

Try the 10t pinion with the smallest set of tires you have first and go from there. If it runs to hot or is too fast for your needs then you'll have to make some descisions. Smaller pinion and or larger spur, bigger motor or just one with a lower Kv, etc.