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You may be right - the previous owner filled the tires, and when I attempt to put air in them, they do squirt out water. I figured that was normal cause my 8N tires do the same thing (again filled by previous owner). I guess I need to figure out how to drain them a little.You sure the tires aren’t over filled? In theory, with the valve stem at the highest location, only air should come out.
Also, that BX has two speeds. I’m betting one too slow and one too fast to mow a rough field. I suppose mowing in high and using less treadle might lesson the beating as well.