turn the screw to the right lightly till it bottoms out...thats the closed/seated position...Turn the HSN 4 complete turns to the left from the seated/ closed position. start engine...adjust the other screw on the side...the LSN...so the engine smokes heavily and and spits fuel out. Idle 1 tank of fuel...2nd tank, start to give it a little throttle driving in a figure 8 or something. don't hold it open, vary from idle to just above idle.. 3rd tank same thing but a little more throttle... 4th tank, adjust the HSN 1/8 turn to the right and more throttle. every tank thereafter...adjust the HSN to the right in 1/8th turn increments till you find the sweet spot, if you go to far...it will be too lean and will cut out on a full throttle blast. once you find the spot, run with it. then go back to the LSN and fine tune to a nice idle. that should work out great for ya'.