If you have a XXX-NT sport RTR with the Dynamite Mach .15 engine, then they suggest 2 1/2 turns out (counter-clockwise) on the high speed needle and 4 turns out on the low speed needle as a starting point. If you check out horizonhobby.com you can download the .pdf file for the Mach .15 engine. (dyn0880-manual.pdf) Click on mach .15 details, support tab on bottom of page. If you have a different engine, then horizon may still be the place to look. Also, get an infra-red temp gun to aid in tuning. It's $25 - $40 well spent. Hope this helps. Good luck and have fun!!!!!