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 - Identifying Your Tractor - by Staff. Maybe you bought it from a friend who didn't know what kind of tractor it was, or perhaps (and this is every tractor fanatics dream) you stumbled across it in an abandoned field covered with weeds but intact. In any case, you have no idea what the make and/or model is. For awhile perhaps it doesn't really matter. Especially if it runs! But pretty soon you'll probably need to tinker with it a bit and maybe buy a part or too. Having a manual is nice. But how does one go about dete
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