Frank,

Reread the YSDoctor: Here is a direct cut and past from the page http://home.att.net/~ysdoctor/ys.htm

LOW END

After top end is set, bring it to an idle 2,000rpm's. From full throttle set your trim so it will hit 2,000 instantly not drop slowly like 35,30,25,22, 2,000. NO it has to hit 2,000 BANG.........After about 3 seconds, the engine will start to let you know if it is to lean or rich.

If the mixture is to rich, the rpm's will start to slow down 2,000 19,18,17. Lean the low end.

If the mixture is to lean, the rpm's will start to speed up 2,000 21,22,23. Richen up the low end.

Remember, after you adjust the low end, always bring it back to full throttle and back to an idle to test your adjustments. DO NOT CHASE THE MIXTURE. make the adjustment within 5 seconds when you hit idle, Do not let it idle for 10, 20 seconds and try to adjust again. You must bring it to full first and back down to check the adjustment.

After adjusting the low end, it should idle at 2,000 consistently for about 20 seconds.

After the 20 seconds, bring it back up to full throttle by rolling the throttle stick up. DO NOT NAIL IT TO FULL !!!!!! THROTTLE............ Roll it. It should take you just over 1 second to go from idle to full.

Another trick to test if the mixture is correct is to pull off the fuel line at the carburetor at idle. There should not be any fuel coming out of the fuel line. If you do, you are still to rich. This is best done on the bench and not on the plane.

End of paste

Also remember that the idle needle is an air bleed, so opening further means leaner.

Dale