It's pretty easy to tell how an engine's been treated, if you pull the valve cover(s)and there's a lot of sludge/ varnish in there, there's probably a bunch in the pan, too, and detergent oil could wash it loose to run through your bearings, etc. Anytime I have anything that's questionable, I'll change the oil & filter as soon as it picks up any color (gas of course)at least a few times if I go with detergent. If it's clean under the valve cover, should be pretty clean elsewhere, good sign that it's been maintained well. If you have a good filter doing it's job you might not see much color for a while, as the filter"s catching the crud as it should- but if the filter gets full, it'll bypass the crud back into the engine- not good
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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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