Off the top of my head I think the carb # for a gas is 362173 R92. They first used R91 carbs but all those were supposed to be changed over to R92 carbs. Unless you have a kerosene carb Those carbs don't have a econimizer slot or a hole in throttle shaft bushing. The idle air adjusting screw is smaller on the end than the ones for earlier carbs. If someone put one in from a rebuild kit like most sold that could be a problem. If there's another problem with engine you may have to have the throttle stop screw in farther so that butterfly is open enough to have fuel comming in from off idle fuel circut causing air adjustment screw to have less effect. Sometimes if timming is off it will make the idle air adjustment have less effect. Unless you have a kerosene carb or other, the throat in the carb sould have a 2 holes. One were butterfly closes and a real small one oppisite air adjusting screw.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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