Re, air pump that went in place of a spark plug. We had one back in late 5os and the valve part that screwed into the spark plug hole had a one way valve that would open on the intake stroke so most of the air sucked into the cylinder was gas free. We used it on our JD 420 as the 2 cyl had a larger displacement per cyl.
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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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