Your white smoking under no load over 1500 rpm is an indication of the automatic advance not advancing far enough or static timing too late. Need a window on pump to observe automatic advance while running. Fuel pressure is critical on that which would mean you have to have a full flow of fuel to pump through clean filters for starters and proper fuel pressure which is adjustable on those pumps. Lot easier to check than nozzles and very little expense. Realize of course those engines are prone to slow cleanup of exhaust expecially if they still have the low compression pistons in them and possibly valves have been ground to lower valve protrusion and of course comp ratio.
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Today's Featured Article - Product Review: Electronic Ignition - by Staff. Oil, for example has come a long way in the last 50 years and I don't use anything but the latest API grade available. I've heard the arguments for non-detergent oils but would never trade it for today's formulations. Paint is another, the modern acrylic enamels are great for resistance to grease and fuel stains, retaining their shine and they last forever; unlike enamels and lacquers . Still another is the alternator. No doubt using the original generator keeps the tractor pure, but for thos
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