Jesus you are mixing up years, models, types, cams, heads, ignition timing, pipes, and putting it all on the responsibiltiy of a cam change between models that are not even compatable. Good Luck With That Took the words right out my mouth. I feel sorry for someone doing a search of YZ cams in a WR. Comparing a bag of potato chips to cole slaw back to an apple. Hum is this the reincarnation of guy that took the starter out of 2012 model to lighten it up a bit.