losi 10mt, 1/10, 40tooth spur started with a 15 pinion right down to a 12. tried 3s 3500mah 30c and 2s 5000mah 60c still the same, but as I said 3800kv 3656 motor and a 60amp esc works fine. but when I tried the q20amp esc with the new motor same prob. that's why I was thinking it could be something wrong with the esc.