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07 CRF450X miss firing

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Hi guys. Last time i was down at the beach my 450x started to misfire - like it was missing the explosion every couple strokes. It has started doing it when im hard on the throttle at any rpm or if im riding it light it does it once i go about half way up the rpm band. do you guys have any idea what it is? i was thinking its eather a fuel or spark problem - a dirty jet or carb and/or it needs a new sparkplug? any ideas? thanks guys!

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