I guess I'll be the one to answer your question. lets keep it simple and by the manual. Run your engine up and tune it as you see fit.
* Now while the engine is at an idle, disconnect your fuel line from the carb nipple. If the engine rpm goes up before the engine quits, your low end is to rich, therefore close it a bit.
* If your rpm goes down and the engine quits, your too lean, therefore open the needle a bit.
* Now a "bit" is maybe an 1/8 turn at most. pesonally i go for a very slight increase.
* If you close the low end to much your engine will not start.

HIGH END- This is mostly a no brainer but if you get it to lean, you can burn out a plug or the engine will overheat and quit in flight and always in the wrong area.

There is a "pinch method" but you need to be careful with this.
If you think you have it right, give your fuel line by the nipple a very quick pinch/release and listen to the rpm. As with the low end I goe for no change to a slight increase in rpm. Some people try to get every last rpm out of it and that can get yo into trouble.


This is all in fine print in most manuals which most people overlook. I have been using this method for quite a while and my engines run perfect.

Later.