Since it sputters when you move the idle out, and you think it is a gas supply problem do the following:
1. Set the idle to 1-1/2 turns out from bottom (beginning default setting) 2. Start it with the choke on. It should run 3. Try taking the choke off; if the tractor dies, you are correct it is not getting enough gas. The main jet passage is plugged. 4. Remove the nut that you have at the lower left side of the bowl. Deep in that passage is the main jet. It needs to be cleaned (just soaking a carb will not free this passage).
(the reason this works is the choke circuit bypasses the main jet and adds fuel at a different place in the bore of the carb. Every time I have had a motor that will only run on choke, and die wide open was due to a plugged main jet)
Like old said you need a long torch tip cleaner or I use thin plastic string trimmer. The jet is removable, but that is better done off the tractor with a screwdriver custom ground to the width (it is brass and easily damaged with the wrong screwdriver).
If you take if off again, try blowing compressed air through each hole of both haves. You should be able to feel a good stream of air from each passage way. If it feel restricted clean the carb again.
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