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 - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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