2000 SCRAMBLER cam problems ? HELP

any help would be awsome thanks … so i have this atv that bogs/misfires or somthing not sure how to explain it when i touch the throttle in forward nutral havent tried reverse .. it used to only do it after 15-20 mins of riding now it dose it all the time and then somtimes it dosent do it its very weird anyway i have pics of the cam was wondering if somone could tell me if it llooks ok or not and if it dose look ok what else could be wrong ..i got ripped off pretty bad when buying this thing…… also the clutch rattles really bad while running nutral/drive not sure if that has anything to do with it … i dont think its fuel related lots of gas ..it dose have orange spark not strong blue … i dont know im at a total loss been trying to figure this out since summer

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