I bought a 07 crf 450x and have been lookin for a site to help work on my new ride. Already did the bafflectamy, did the smog pump block off, and will be doing the air box mods here soon. Just sayin thanx to those who helped me with the know how of my bike. I went from a 05 trx 450r to the crf 450x. How similar is the motor????