Yes, it runs rich, as all 4 plugs are black, however, it always smoked when it wasn"t under load, and all 4 plugs have always been black. The dealer put richer jets in it because the combine would fall flat on its face when it was working at full load. Since the jets were changed, it ran great under load, but would load up on fuel when standing still. I just ran it again and noticed that at idle, there is a definite and consistent plunk in the air cleaner, which makes me think it is backfiring through the carb on one or two cylinders. With such good compression, it couldn"t be valves, could it?
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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