no expert but i think the top one where tube/shaft from governor attaches is idle stop screw, controls idle engine speed by limiting how far throttle valve closes in carb. screw it in for faster idle speed out for slower. one at bottom of carb probably faces up is load adjustment at full throttle or under load , screw out for more fuel in for leaner mixture. other one, probably located just above carb bowl is idle air adjustment, controls fuel mixture at idle speed, out is more air-leaner mixture in more fuel. suggest checking owners manual or getting one
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Today's Featured Article - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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