As far as an "Idle adjustment screw"-- remove the filter housing for an easier access, but it's quite visible from the Throttle butterfly side on the Carb--- as far as an "Air Idle-Fuel Mixture" on an '03 XL 883??? Sorry Bud--- there IS NONE-- it's a "Fixed Jet Carburator" and it comes from the factory, with a sealed pug cover, over the adjustment screw, located UNDER the backside of the carb, which unless you're a QUALIFIED Mechanic, or have ALOT of expeience with the H-D carbs now installed at the factory, your best is to leave it alone, and let someone who KNOWS where the plug is actually located,can "DRILL IT OUT" without harming the Air-Idle Screw", and once that's accomplished, you can easily adjust your Carb with a fine screwdriver from underneeth the carb, while it's running. Harley-Davidson, has STRICT Emission regulations, that prohibit the adjustment of that Fuel Mixture Screw, due to E.P.A. Standards--- Hope this helps solve the mystery of "Where's It At" !
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