Our 4600 is a Yanmar engine like yours, and it seems to run a little cold, but it always comes up to the same spot on the gauge, and stays there while operating regardless of load, so all is well. I checked it once with a heat gun and it was a little on the cool side, but was told that's OK, and it has been for 20 years. If your worried about it check it with a heat gun for hot spots, and then put some kind of gauge on it as suggested.
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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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