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YOu should do your exhaust and carb at the same time. I'm thinking you need a smaller slow jet to get low end power. These motors have a lot of power at the low end. You must be running rich at the bottom. It could be lean as well.
Every time you change the air flow it impacts the fuel requirement. By the end of it, you will be a carb guru if you keep tuning it at each step. Also, make sure the boot at the throttle cable input at the top of the carb isn't leaking air. This will impact your idle if its leaking.
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