There is a descrepancy between manuals on the LST. The Mach 26 sheet says the high end should be 3 1/2 turns out, but the LST manual (at least mine) says 2 1/2 turns out. I split the difference and started at 3, but I ended up around 2 3/4 turns.

On the low end, I found that 2 turns out was too lean, and ended up going 2 1/2 turns out before I could get mine to idle. the low end screw sits flush with the thottle slide housing now. It might be a little too rich, but it worked and that's where I left it.

Of course temperatures and humidity will make a difference with all of these settings, but I think 3 1/2 turns out is too rich.