Hello all, I just want to say up front how much I love this forum/site. You all have helped me immensely already. I have two things I am trying to accomplish on my newly acquired bike, a 99 WR400f. I have plenty on experience with 2 strokes, but I need to check out my valves and clean them. Are there any forums on here describing this procedure? Is this something that and inexperience stroker should do for himself the first time? Should I just take it to the dealer and have them clean/spec it? I really would like to learn so I can do all of the maintaining of the bike myself. Also, what is good yz exhaust for this? thanks.