Since I had a need for these, I made several. This harness will allow you to run a Suzuki GN250 TCI on your 1980 through 1983 XS650. The GN250 box will directly replace the Yamaha XS650 TCI. The TCI box IS NOT INCLUDED. You can buy one here:
CDI Ignitor Box Digital Ignition Fit for Suzuki GN250 Motorcycle
The harness is about ten inches long and the wire colors match the XS650 wiring diagram. The TCI side is a Yazaki locking connector. The motorcycle side is a Sumitomo locking connector. What's pictured above was tested on my motorcycles.
I will need to know whether your XS650 has a six pin or eight pin connector. The 80/81 bikes are six pin. The 82/83 Heritage Specials are eight pin. I have a limited number of each and I'll pin to order.
I will ship to you for $30.00 if it can get to you in a USPS Flat Rate Box. All others, $20 plus shipping or $20 at my door.
The TCI box is not included. The pictures are to clarify what this harness fits.