xsleo i'm going to quote you on that (The XS650 NEVER used a CDI, it uses a TCI)!! to my left is my avatar it's the (ignition unit)CDI box it reads type tid12-01b 4m4 10 from my 81 xs650sh-h chopper i bought it on ebay its exactly like the one on my chopper. a new one goes for over $300 i check...