An engine is an air pump. As pistons move up or down and displace air, breathers take in or displace air from the crank case. For as much air is moved up or down, air gets moved around, traveling the same direction. If an engine was perfect with no leaks, whatever is moved around in the crank case would stay there between cylinders, but nothing is perfectly air tight. My guess, you have a breather blocked or rings blowing by, and the air is trying to ventilate where ever it can. If you have actual bad o-rings at the dipstick tube, chances are that you can get replacements from an auto parts store that carries "DORMAN" products (orange steel drawers).
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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