I change mine on low use engines once a year in the spring after the temperatures stabilize. I have always changed mine at 3000 miles and will continue to do so. In 200K miles and $30 a change it only adds another $1000 or so. For me that's less than $100 a year. It might be wasted money but I've never had any engine trouble. On my tractors I change at 150 hrs or once a year in the spring, whichever comes first
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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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