Just a guess but maybe the problem is with the compression release mechanism.
You will either have to pull the carb and remove the breather cover to see if the exhaust valve is popping up a little on the compression stroke or the head will have to come off to see it.
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149,682,1641,1711 with a 12hp in it 1 8" brinly plow 1 10" brinly plow 451 snow blower,H-48 International snow thrower 42" york rake with fold down grader blade.
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