You might be better off waiting for the manual. There are a lot of little diagrams & instructions. One thing when you get your manual, there is a print error in some copies that directly pertains to power valve assembly. See CDave's website for the correction: http://justkdx.dirtrider.net/correction.html
Do a search at the top of the page for "power valves." You will find a post from Canadia Dave tellting how to line up the valves. I believe its when you pull the main exhaust valve all the way forward, then the two side valves will be in the open position. Double check me on that though. While you're in there read all the posts as there is some good information. I just got my 220 back together after cleaning the power valves and replacing the piston with a Wiseco. To every one thinking about replacing the piston .... go ahead. You'll be glad you did. Man this thing runs great again. The main thing to look out for is the left handed threads on the rod thingy which connects to the powervalve. Good luck and Happy Trails.