RE: Question about a 2 stroke engine...
Let me elaborate on what Chuck said...
First, bring the engine to full throttle. Lean the mixture until you hear the engine peak. At this point, make a mental note of where the needle is set. Keep leaning it until you hear it start to sag (This should happen within about a quarter of a turn). Then, richen the mixture again until the RPM drop (Very) slightly on the rich side.
Now, bring the throttle to low. Allow it to idle for about 30 seconds. Does it maintain a good idle or does it die? If it maintains a good idle, rev it back to full throttle. If it does this well, you're ready to go.
If it dies at idle, or if it does not transition from low to high well, then bring it back to idle (Restart if necessary) And before it dies, pinch the fuel line with a pair of pliers. The engine SHOULD run for a few seconds and die. If it dies almost immediately, the low-end mixture is too lean. If it runs for several seconds, the low-end mixture is too rich.
Keep in mind that each time you adjust the low end, you'll need to bring the engine back to full throttle and re-adjust the high end.
Good luck!