Weird noise after top end

So i rebuilt my 09 yz250f (piston new valves) and i put it together and now it has this weird noise that makes me very uncomfortable when riding. Almost sounds like piston slap, here is a video of it im just lookin to get this thing fixed fast, been off bike 4 weeks and getting verrrry moody lately with no riding. th_F30CFC1C-6773-48BF-A9FC-22F840AF5600-

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