I run a 7.5 Thunder Power in my K1 with some boost and turbo and it doesn't get that hot so I'm not sure that the motor is your problem. But I have heard a few people with problems with RS Pros having thermaling issues in 4wd mod, the few people that do still use them that I've seen seem to double up on the capacitors to help reduce temps, also ensure that your speedo is in Dual Drive as this can also help.
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