I've watched several of my instuctors tune my engine while I was training. Now that I"ve solo'ed and and flying on my own sometimes there aren't people out at the field to help me tweak it I'm trying to learn how to a little better. I think I've got the basic theory. Tune high end - pinch test should sound stable rpm or just slightly speed up with throttle wide open. and essentially the same for the low end at approx idle after the high end is done. Is this anything near correct? Where do I pinch. between tank and needle valve for between needle valve and throttle and carb?