The stock hobbit kehlin carbs are finicky as hell. I've been in the position to think I had a fuel flow issues many times when it turned out the carb was just dirty.
They have all sorts of places for shit to hide and I've had completely clean looking kehlins stop fuel flow.
I've got a three step operation now... Clean throughly with compressed air and solvent. Pretend I put it on the bike and it was still fucked up, drink beer...repeat two more times (edited)