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Backfiring on No Throttle, deaceleration

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Hey Gents,

My CRF250r (2007) is backfiring a bit on 0 throttle / deceleration.  I have read that there are 2 main factors that can contribute to this behavior.  First, valves or timing is off.  I have recently checked them 2X and they are good.  The second factor could be lean on the pilot.  

Could there be any thing else that would cause the bike to back fire a bit?  Can I just richen up air-mix screw a bit to see if it goes away?

Thanks!

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