You know, I kept seeing this posted over a few forums. My head gasket was weeping so I decided to re-gasket the top and sides while I was at it. I decided to clean the pistons and head too. I ended up breaking one of the rings. So, since I could not get a set readily, I ended up searching for the various posts I saw concerning using car rings for your bike. I got the Acura rings. Same number. First problem, the inner oil ring did not fit. No problem. Used the old inner ring. Next problem, I put the bike back together. Started right up. Accelerated and lo and behold, my bike put out better fog than a fog machine. Outside of a valve stuck wide open, which you would not only hear but feel, the only other conclusion would be the rings. I didn't mention earlier there was not even a trace of smoke prior to me changing those rings. I know how to set rings so that wasn't it. I probably should have measured them but saw so many posts concerning the use of these that I figured what the heck. And I NEVER take things for granted when working on vehicles, but I did this time and it bit me in the proverbial.
Minus the $55 for the poor advice from the guy who has gone to so many forums to post this info, my bike will live to ride smoke free again as I have ordered a set of original rings (original bore on this bike with super clean walls) online.
My advice to you. Be careful when you stray from what is made for your machine. Aftermarket parts that are designed for an engine are fine, but ones that are not specifically designed for a bike might not work. Stick with what was made to work and your bike will live a long bike. I have owned a lot of bikes, and to me, the XS650 is the King of the Road! Take care of your baby with original/OEM/aftermarket parts specifically made your machine.