should have the IH carb on it. i think the main jet size is around .055. pop that bowl off n go to the harware n find numbered drill bits. find the bit that fits the main jet as the starting point, then go up 3 sizes bigger. I would say that a .080 main jet would help the stumble n power loss if nothing else is wrong. my old 460 with a 263, the carb jetting was .090 on the main jet size, but i had her running 2300rpm. ran great! another way would be to find a 715 combine carburator that has extra ports to deliver fuel better.
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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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