I burned out my TrackStar 4000KV waterproof motor today.

I burned out my TrackStar 4000KV waterproof motor today. My final drive ratio is about 9:1 (17:54 pinion and spur, 13:37 pinion and ring gear). I am using Duratrax Six Pack ST tires and wheels. The OD of the tires is about 100mm. Is there a better motor and ESC combo to go with this setup? I was driving in grass so I was going all out most of the time… But it would be nice if I never had to worry about the motor overheating.

I have my new drivetrain completed. Just want to do some testing before I go through all the trouble of documentation.

Picked up a Castle Creations Sidewinder SCT from the local store. It’s 4 pole and 3800KV. Got a couple smaller pinions to try out. This also came with a motor fan.