Lightning,

The throttle should be open 1-1.5mm for idle.
The idle needle should be open a certain number of turns.

The high speed needle should be set tor a rich, two-cycle setting, just beyond the point it starts to run in two-cycle mode.

If it is a very smooth two-cycle, enrich it a bit so it "misses" every now and then.

Don't make it too lean. It will damage the engine if you do.

Don't allow the RPM to sag, as you lean the mixture.