Listen to the noise at idle, go to the carb side and move the governor to carb rod a little, (enough to make it change speeds a fer hundred RPM, not much. Listen to that knock, if it changes or goes away irregularly, and then comes back, it could be a wrist pin. I would not worry about wrist pin noise, engines can live for many years with a noisy wrist pin. If the noise stays consistant, and seems deep in the engine, Living with it might be OK. Keep tabs on the oil pressure, If the needle fluctuates radically at idle, I would probably remove the pan and check bearing clearances. If the pressure is OK, just keep an ear to the noise, and if it progersses, or changes, I would suggest a teardown sooner than later, as expenses mount as connecting rods find daylight. Jim
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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