I actually have had the bike for about 8 months now, but in between building the kz550 and me and the wife welcoming our first child into the family I just recently had the time to start checking into the xs.
Yesterday I removed the carbs and soaked the all that needed cleaning in cleaning solution. Before starting I checked the timing chain, which needed adjustments and soaked the cylinders for a day with a little trans fluid in each cylinder. Put the carbs back on, made a temporary tank and installed new plugs. To my surprise it started on the fifth kick, and sounded pretty good. I wanted to make sure the engine did not need anything major. Next I will service the brakes so I can take a short ride to check the transmission.