Is the float level set to specs and the needle valve closing, no evidence of flooding?
Changing the main jet should not effect the idle mixture.
If that carb is like most updrafts, turning the idle screw in richens the mix. The screw adjusts air bleed, not fuel. The idle mix will only adjust when the engine is at dead slow idle, anything above 500 RPM or so will be picking up the midrange circuit.
Check the idle air bleed to be sure it is not clogged or the wrong top gasket is blocking the hole.
Be sure the throttle plate is correctly installed and not bent. With the idle stop backed off, the throttle plate should close completely air tight, fit perfectly in the bore.
Didn't find your exact model, but this should be pretty close.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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