Rob- I know some on this board disagree about wholesale replacement of compenents as a way to fix problems, but putting in a new condensor (yes part of distributor), points (gapped correctly), rotor, cap, little copper distributor wire, coil, plugs, etc. are fairly cheap and elimnate a host of potential problems OR COMBINATIONS OF LITTLE THINGS that add up to a problem like yours. Chnage these things out first and try her. If it doesn't work you haven't spent much and you have the old parts to use as replacements. Now, It is possible to detect SOME leakage in the intake man. gasket by squirting heavy oil around the gasket while engine's running, but you can't get all the areas and may miss the area that is leaing (if it is). Personally don't think that's your problem. After tractor dies have you pulled the plugs out (hot) and looked at the sparks in each plug? If nice and white/blue, then you do not have an ignition problem, start looking for fuel supply related problem. If you are getting plenty of gas TO the carb, then check carb float level air/fuel screw settings. Check all supply lines for leaks like by that damnable fuel bowl. It has a habit of backing itself out and sucking air into the line there. If these check out, you can try the manifold test I described, but again, it only works if you've squirted oil on a leak area. Your problem is definately ignition or fuel related so keep working these areas. It's so easy to overlook something simple. If you saw a post from me a few days ago about an almost invisible tear in the rotor spring that's an example of how a $2 part can make all the difference. Don't give up. Learn your tractor and you'll be able to diagnose and fix problems very quickly. Best of luck.
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