I read through the sticky but didn't really see an answer to my question. All of us WR guys are putting YZ cams in to wake the bike up, but does it work in reverse? Looking at getting a YZF426 for my son, its a little too much bike right now, but he is a good rider and can easily grow into it. I have a 04 WR450 cam in the garage....will it fit the YZF 426? If so, will it mellow it down and will the auto decompression work? If not, what part do I need to do this? If I can't mellow it down for him, what do I need to get auto decompression working?