A lot of working on these tractors involves, "Try something and see if it fixes the problem," instead of standing around scratching your head trying to scientifically analyze the problem. So you think it's a carb problem? Well then, tear into the carburetor, clean it up, install a rebuild kit. Chances are your carburetor needs a good cleaning anyway, and you'll learn a bunch about how carburetors work, so it won't be time or money wasted. I agree with you. It does sound like the carburetor. In particular, it sounds like a sticky needle valve that is not opening to let more gas into the bowl. A couple of tips: 1. Get an IH rebuild kit. I've heard the off-brand ones are horrible. 2. The new needle will be rubber-tipped. You need to seat the new needle by tapping it into its base. A small flat screwdriver will wiggle the needle loose again. If the rubber tip now has a nice even indentation all the way around, it's good. Otherwise, seat it again.
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