2000 YZ426F jetting question

I have a 2000 YZ426F and im starting to do some modifications on it. Im thinking bout changing the jetting on it...but not to sure what i should change it to. Can someone please tell me what is good to do on it? also any other modifications you think are good Ideas please advise is possible. im thinking bout a K&N air filter also.. any other ideas. Any information very appreciated.

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