GSX250SSN Service Manual
https://drive.google.com/drive/folders/ ... XU3UU4-AVy
(Forum won't let me upload so a link to the share on our Google Drive).
This PDF is searchable to make it slightly easier to find things (though as in Japanese mainly, not that easy!). You can cut and paste the part number out for searching on the internet though.
Thanks to Damian McgGinnis for the original scanning.