[riverat1540]

my guess is the high amp spike as well. my muggy just blew a mmm3 on 6s running the 2200kv neu 1515/1y tying to pull wheelies at high speed. that draws alot of amps with the heavy losi's when u push them hard under alot of voltage. but with your gearing im not sure, i was geared for about 50 when i had my problem on 6s. motor and battery temps were also fine when it flames up.