01 WR250F acting wierd

My 01 WR is making me nervous. It has a Z start and 03 YZ cam installed as well as most of the other TT mods. It just started stalling very easily when I stop and when I kick it over to restart, the kick starter rolls over much easier than before and kicks back hard, like a backfire with no bang. It still eventually starts but it seems like something is not right. It had a new top end last spring and had the valves rechecked probably about 10 hours ago. Any opinions are appreciated.

could of jumped time. or your valve is stuck or the decomp arm.

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