Mine will idle forever leaning on a tree. However, I have seen a Keihin PWK38 on a KTM 300 with some casting flashing on the nozzle, and that bike was always a bitch to jet. Check that out and clean it up if present.
What else are you going to do for a carb? The Mikuni is a more of a PIA, we swapped it for the Keihin on my brother's Husky last year and never looked back.
If all else fails, call Ron at RBD.
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