Here's the problems as I see 'em possible. You've said you've adjusted the float height, so I'm gonna say adjusting it won't fix yer problem. Try this. Grab the end of the needle with a small pair of needle nosed pliars and give er a twist in. For some reason, this has seemed to help some on occasion. Next, check to make sure your float is still good. One little pin hole, or a collapsed float will not be enough to float, thus won't push the needle up. This can be hard to tell. Put some fuel in a jar and see if it floats REAL good, or wants to sink after a bit or float lower. Maby compare to a known good one if you have it. Next, check float clearance. I used lip stick on the float.....turn carb up side down, and put the bowl on. Turn over, shake up and down a couple times, and back upside down to take the bowl off. See if you have contact. (color optional on the lip stick) :) I'd also suggest a paper filter if the tank isn't REAL clean. Also, take apart the fuel line, petcock, elbows, etc and make sure no rust flakes are hung up anywhere. Good luck!
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