you should leave the needle alone, do all your adjusting with the pilot and the main jets and the air screw, find the "basline" for your sled, a good manual will have this info, moving the needle makes a huge diffrance sometimes too much to compansate with jetting, and if its to the lean side it can spell disaster, now im sure some people here will disagree, but if you spend the proper time to jet and play with getting you airscrew dead on, the needle will stay in the stock position,"which should be mid-clip" this comes from a guy who has done a bunch of carbs on 2 strokes and has never burnt a piston, or seized a cylinder.[8D]