Dunno, I started wayy to far out and then visually adjusted it to where I could see the outlet just going over the tip when the intake was just closing. Kept leaning it out until throttle response just got a hair sluggish, then went to leaning out the high end mixture. It was at that point that the engine stopped dying after 30 seconds at full throttle with glow starter removed. That was the original issue. The engine seems much more sensitive to rich running that what I was used to.