Pulled the carb drain plug - good flow there. Cleaned the bowl and inline screens. Found some small particles of red paint/rust, but not enough to impead flow. Dissassembled carb - no dirt evident. Float and valves are good - replaced a couple of years ago. Blew carb cleaner through passages and reassembled. Set the mixture screw at two turns out - usually set to 1.5 - so a bit richer as suggested. I have never adjusted the governor. Took a look and found the bumper spring screw was socked down all the way - no thread showing. Removed the whole threaded assembly. It look good, spring and ball on end seemed ok. Reinstalled with about 1/4 inch thread showing.
Tractor started right up. Gave her a run pushing back the snow banks. Ran without "rolling" once.
Can't exactly say what fixed it but we're operational.
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