On identical tractors the carb mixture needle settings can vary widely from one tractor to the next!
I have a pair of Super H's. One requires 3/4 turn open on the idle, and 4+ turns open on the high speed. The other needs about 1 and 2-1/2 turns open respectively.
NOTE! On the SH carb the idle screw works opposite from the high speed screw - turning the screw IN makes the idle richer.
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The carb idle stop screw is simply that - a mechanical throttle shaft stop that sets the low idle RPM. Simply turn it in/out until the engine idles at the speed you want (450 RPM or so for the SH...)
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That small felt you found in the kit may be the drip hole filter. It fits into a hole in the boss at the bottom of the air passage beneath the choke plate. The filter is retained by a small, pressed-in washer.
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