I been running and racing the Boondocker for 4 yrs now, And have not burned my sled down, really no problems to speack of. Wish i got bigger spray nozzels though. it really simple to dial in, and it dumps fuel in as well as the NOS, so it pretty safe on the motor. It dont help with the extra 4LBS, but really caint tell the wieght difference. But I also running 2 1/2x 16x162 track so it robs a bit of horse power. Grass drags it was awsome, hill cross races worked great at the hill towards the finish. DO NOT HIT THE BUTTON when in the portion of the snow cross part of the hill cross race though