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Back firing kx250f

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My friends kx250f has developed a seroius back-fire,off throttle.

It runs great on throttle,better with choke on, fuel screw has no effect.

He checked valve clearance,exhaust leaks as per dirt rider,nothing.

The bike used to run perfect,has an fmf pipe& silencer.I read to check

Hot start plunger-seal?or slide wear plate?...I.e. air leak...yea it seems

lean,lean,lean...any help? anyone? Eddie?.. chepy Oh, I think its a 06

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