after its broken in you have to tune the motor. like i stated above, im assuming your idle is set too low and your still pig rich. lean out the HSN in 1/8 turn incraments untill it you get optimum performance and still a nice trail of blue smoke. if the leaned HSN doesnt do anything, try leaning out the LSN in 1/8 turn incraments if necessary, and then set your idel after that.

http://www.youtube.com/watch?v=oSmMzpZM_As

http://www.youtube.com/watch?v=BJFsJAxNoRg

i use those wideos to help tune. i know its not a buggy, but its basicly the same exact idea for all nitro motors.