Hey 91integrags, There is a line on the HSN housing for stock setting but mine is about 2.5 out from closed i would start there the hsn at stock is very rich, the low is flush then ajust from there and the mid is flush, now on the mid take the HSN housing out and look in to see the mid needle there are four holes in the mid needle aline one of the holes up with the hsn hole i then sealed off the mid needle with some high temp rtv, hope this helps.