On the bottom front of the carb (pointing forward) is a screw. Above that just below the flange are two screws. The left most screw at the top is idle speed. To the right is idle mixture. the lower screw is load mixture for full throttle. I would adjust the top right screw out and in till it cleans up the smoke, and the left top till the idle is about 500 or so. If the right screw will not control the black smoke, the float level may be too high in the carb. If the adjustments work, the engine should go from idle to full speed when the throttle lever is quickly moved from idle to full throttle with no stumble (warmed up). If not open that bottom screw 1/2 turn at a time till it does. Jim
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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