<div class="FTQUOTE"><begin quote>Originally posted by: TractorPacker

All the 400's I have jetted have been 168 to 175 main 40 pilot raise the needle 1 and back the air screw out .5 to 1 turn. This is across 7 400's, all 99 thru 03, with different slipons and opened or drilled air boxes.</end quote></div>

i just read 6 or 7 posts on this and they all pretty much say what i say.well let gsjeepxr look it up himself and see.search the forum on 400ex air screw.and let me know what you find .youll see