Thanks to all, for the valuable info on sohc motorcycles for newbies like me. I had purchased a 1976 honda cb 550 about a month ago and did not know a thing about it. I was lucky enough to find the sohc site and appreciate all the info and the awesome pictures that members have posted. I learned so much and finally developed enough guts to tear apart and put things back together with some confidence. Still trying to bring the bike back to life and just ride soon I hope. This site is awesome. Thanks, sincerely Sung Kwak!