When on diesel the butterflies in the manifold are wide open, and they close on gas cycle to make air travel through the carburetor part of the intake manifold. Does it smoke quite a lot of blue smoke when running on gas. You might not have total diesel fuel shut off when running on the gas cycle and the unburned diesel fuel makes it rev up when throwing decompression lever. Two ways to test. Open the bleeders on nozzles when running on gas to see if it changes exhaust, if pump is adjusted properly it will not. Other thing is to shut it down on diesel and immediately check for gas in bowl of carburetor. You may not be able to get gas out of carb drain with engine running on diesel due to pressure differential. Also, if it is using the gas out of carb it will die when trying to switch back to gas when running on diesel.
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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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