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'06 crf450x pop in the airbox when i hit the kill switch

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is it normal to feel what seems like a strong air bubble popping in the airbox when I hit the kill switch?

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New piston rings, cam chain and intake valves. Got the '06 450x 'bout 9 months ago and that was a first time for each project. One of which remedied the deep pop in the airbox. It was weird. Only did it when I returned from a more than a short ride (at least 30-45min) when I hit the kill switch. Now it seems my only prob. is back-firing any time I quickly let off the throttle. If I slowly ease off it I can avoid about 5 or 6 pops. My plug has quite a bit of that white powdery look to it. This indicates that its runnin' lean right? Thanks for the response fellas.

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