07 450f running lean?

I'm new to the new four stroke world, I just picked up a 07 450f. I noticed the exhaust header glows bright orange and the mUffler occasionally shoots a four to six inch blue flame. It also runs better with the choke on. I was told that the bike is running lean. WhaT could be the solution to this problem. Would the air fuel screw help richen up the bike

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