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I've never seen a carb with an air and a fuel screw, it's normally one or the other, plus the idle adjustment screw. I'd like to see a few more pics, if you don't mind.
1. some pics of this 3-screw carb
2. some pics of the main jet and pilot jet shown above, out of the carb to get a better idea of what style and make jets they are, along with some basic measurements in mm, including the overall length of both, the width of the main jet head and the width of the pilot jet also.
3. have you tried working from a set baseline that you can return to? From what I can tell in the above pics, it looks like a Mikuni-clone VM26/22 with a butterfly choke that is cable actuated. Knowing what size and make the main and pilot jets are is key to being able to jet it correctly.
4. How many turns OUT from seated is the fuel screw? What slot on the jet needle is the e-clip located?
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