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yz426 carb rebuild?

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I have recently acquired a 2002 YZ426. As far as I know the bike is stock, with the addition of an fmf powercore 4 exhaust. The air filter is clean, and our elevation here is about 1200ft. The bike runs really strong on top, however it is difficult to keep running at lower rpms, and it spit and sputter at mid range. Looking at the exhaust tip it looks to be running really rich. I bought the bike to ride in the woods, so I really need it to run well at lower rpms. I also know that the previous owner had "worked" on the carburetor. The bike is also hard to start. Where do I start to sort this out? Is there a kit available so that I can put the carb back to original?

Thanks in advance for the help


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