Before you get in too deep consider this: I struggled with identical running problems on a friend's 400. Rebuilding the carb, installing a new distributor, resetting the valves, etc. each improved it a bit. But it still ran poorly, constantly fouled the rear 2 spark plugs, etc.
Problem was finally traced to a vacuum leak in the 1-2 intake manifold gasket.
Replacing the both manifold gasket then readjusting the carb got the tractor running like new.
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Today's Featured Article - Magic Moments - by Tyler J. Woods. Magic moments don’t just happen. You have to help them along. This morning, I got up early. It is my day off from my regular workweek and I had a lot of things to do. It’s fall, and with winter coming on, there is a lot of work to do before weather closes in.
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