Hey Jim, sc10 4x4 is totally different, starting with pinion type. The sc10 uses 32 pitch gears and the tekno uses mod1. Different tooth size so hard to compare. The sc10 runs so hot because the motor is stuffed in the back like that and the end is covered by the gear cover over the spur. I removed the cover and ran a good 15* cooler. I was running a 12 tooth to try to keep temps under control and in the tekno with exact same electronics I run a 15 tooth., after 8 - 10 minutes my motor is barely warm as a baby bottle. I can actually slap in another battery right after I marshal and go for another 10 minutes all day and night long! I need more batteries now....