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If it will only run on choke and your 100% that carb is clean and float level right, it might be an air leak.
With engine running, try spraying wd40 or similar around the base of the cylinder and carb mount/reed block, if it picks up revs, there is the leak.
Could be crank seals I suppose, but for me they either work or they don't.
Another thing to try . Bypass or replace the spark plug cap.
Ok..... took the common thing I have seen on all these “can’t get it to run right” thread, and went through the carb once again. Every jet is clear, compressed air through every port on the carb. Reassembled, now runs better, but still won’t idle, even with idle screw all the way tight. Revs quicker now, but doesn’t top out, seems to hit a stop, and sputter?
If I rev it in neutral, it climbs then sputters.
Does the same with the air box taken off.
It now doesn’t need choke to stay running, in fact once warm, choke makes it stumble pretty bad. Checked for air leaks, doesnt seem to be any. It is obviously not topping out on revs.
I can hold the throttle a little, and it “idles” fine. But idle screw doesn’t make a difference.
Can you do a video with good audio going through idling revving & medium throttle, or even riding around would be better just going through the throttle rang, then standing there giving it a good rev but opening from idle so we can hear it come up in the revs & see how high it revs to. Thanks.