Hello, I have been a member of the forum for a few weeks now and find a lot of thei information here very interesting. I bought a xs400 around the beginning of March and of course it is a project. I wanted to buy something I could work on and possibly learn how to fix and the xs400 fit the bill it is a 1981 xs400sh ID number 4r4-005502 and when I got her it didn't start but finally got her started and idling roughly. I still have to address a bunch of issues with the bike but thought I should introduce myself and say thanks for all the great information that is on this site.