if you know it is fuel related u can verify by squirting in some premix in the spark plug hole and start. If it runs right off the bat then dies, then try again... but this time keep feeding the carb with premix and messing with the throttle to keep it running. HAHA take that non running pugot
This will let u know a few things, if its fuel related or not, if it will possibly run on choke or not (tiny choke lever), and how off it is meaning how big the air leak is or if it idle circuit or main thats clogged, say if works at WOT and will not idle then suspect main and visa vera.
I think the gurtner has tiny idle passages(take a look on myrons page for a cutaway) good luck and post any findings.