Once you have the low end set (idle ) you should not need to touch that again.

For the high speed needle I do the following:

1. "Peak" the engine, then back off about 1/8 th turn on the needle valve.

2. Next, I move the transmitter throttle to wide open, and pick up the plane and point it nose up. Hold it in a nose up position for about 20 - 30 seconds. The engine rpms should stay the same. If it speeds up and dies, you will need to open the high speed needle some more. If it "stumbles", you will need to close the high speed needle a LITTLE.

3. Repeat until the engine runs the same with the nose pointed up for 20 - 30 seconds.

After that, you shouldn't have to move the needle valve more than one or two clicks to compensate for humidity and/or temperature.