Heat problems with Mambamax/stampede

[hyperasus]

I'm running 2s lipo, 4600kv mambamax setup and oversized Emaxx sized tires. Just can't seem to get these mamba max motors to keep from getting to hot. I've tried gearing from 90t spur/13t pinion, all the way up to 24t pinion. Speed controller stays under 120F but motor will just keep getting as hot as I let it. I killed my first mamba motor letting it get up over 200F (more like 250F actually LOL). Anyone else running close to the same setup? Is the mamba max motor simply to whimpy for the pede/oversized wheels?