Just a question, but has it been a while since this unit has run? If yes, you need to be sure the fuel line is clear and there is no moisture in the gasoline. Drain and clean the sediment bowl and blow out the line. Drain the bowl on the carburetor and try again. The old 200 we had when I was a boy did not run well after setting up and we would have to go through this proceedure every spring. It would be best if you could do some work and run the tractor after you get going. When it starts runing bad again clear the sediment bowl, the fuel line, the screen into the carburetor, and drain the carburetor bowl. Install the fuel line backwards from the sediment bowl so that you can verify that a good flow of fuel passes when you open the valve. Run the tractor until it runs bad again. It may take two or three trys to get it completely clear and yes you do have to do all the above each time. Runing lean at high speed could imply that there is a blockage in the fuel line. IF YOU HAVE A FUEL FILTER TAKE IT OFF BECAUSE THAT ALONE WILL TEND TO MAKE IT RUN LEAN AT HIGH SPEED OR UNDER LOAD. If you have a loop in your fuel line that can cause problems as well. This is in addition to making sure all the issues with the carburetor are settled as discussed by others.
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