Fourstroke, I am sorry if i mislead you, i was talking about doing the pinch test to set the idle mixture. It works because if it is getting too much fuel on idle, when you pinch it, it will lean out. That will cause the rpm rise. Now whether its a small or large rpm rise shows you how rich or lean the low end is. You wan a small rise then the engine to start to die, if you get large of a rise then that means you are too rich. if you get no rise and then a sudden cut-off, then you are too lean on the low end. Generally i like to see a 100-200 rom rise on my tach when i pinch test the idle. Any higher then that and the engine will load up on fuel at idle, then it may stumble when you increase throttle as it try's to clear out the excess fuel. And yes, leaning out the low end needle has no effect on the high end needle, so passing the vertical test wont be a problem. If you need to run your high end a half turn richer you may want to look at your fuel line plumbing. If your tank to high speed needle line is too long then the engine will have trouble drawing fuel (Ask me how i know ) and that may be why you have trouble getting fuel to the carb in a vertical test. Good luck and ask me if you need any more help, you can just PM me instead of using this thread.

sean