What I was told in the manual was to ajust the idle screw, then low speed. Then High speed. But I have a diff. engine on mine that only has the idle and high. Wish I had the low as well, as that would free up the high to give me most top end. as it is, I have to balance it out since I don't have a low.

right now my car is all dissasembled. Replaced the tuned pipe on it (was plastic and melting). The front and rear diff. went out, so now looking for those replacements. All in all a cheap buggy, but I wanted something not to expensive to start out playing with... Seems I should have got a more well know brand name, that way I can get parts But live and learn!