That computer designed carburetor has only one jet. Irgie’s grand plan was to simplify it’s operation by making it more complicated. He was also the master mind behind the carburetors on the Evinrude Lightfour, Zephyr and the Johnson SD. Incidentally, they all work beautifully when properly maintained. That it only runs with the mixture control all the way out indicates a fuel restriction. The idle mix is adjusted by the air bleed screw 202188, top right, looking at the front of the carburetor. They were easier to work on when you could still get the seals, gaskets, primer cups, needle seats and particularly the 202053 venturi.
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