First, check to make sure there is fuel getting to the carb. Drain the float bowl, then turn on the fuel petcock and check to make sure fuel is getting into the float bowl. If so, check the float needle valve and the floats to make sure the floats are not sticking. Check the pilot jet for debris. Take it out, clean it with carb cleaner, blow it out with an air compressor and reinstall. Do the same for the main jet. Turn the air screw all the way in until lightly seated (do not force it), then back it out 1-1/2 turns. This is a good starting point. Back the idle screw all the way out (you are correct, the larger of the two). Some mid-70's Suzuki's did not even have an idle screw. If the bike still does not start, put the old jets back in and try it. If it still does not start, it may be electrical (CDI or stator). Make sure you have the proper gas/oil ratio w/fresh premium (93 Octane) gas, and a fresh, correctly gapped spark plug. Good luck!
Kevin
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