Being as there are no more butterflies except in the intake manifold, and like I said they are wide open when on diesel, I just don't have an answer for you. I just happen to have a carb and manifold laying out in the garage as I am planning on putting that carb on a 450 to replace the carb that had been reworked at one time. I went out and looked over the manifold just to be sure how it layed out but I would want to take a look at the passages in the head also but can't do that. Don't work on them much anymore so kind of rusty. I know this tractor has an extra head laying somewhere also but don't know when I will get a chance to look it over. If the fuel tank stays full when on diesel that means you are getting good shutoff of the needle and seat when on diesel. Are you sure you have sufficient clearance on all the decompression valves so they fully close but that don't make sense either. I just don't know. Will think about it some more.
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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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