Check http://pure2strokespirit.net/ for manuals, part lists and other resources
https://m.ebay.com/itm/Yamaha-TZR250-Throttle-Pump-Cable-Assy-NOS-1KT-26260-00-TZR-250-2MA-1KT/253439289528?epid=1311871299&hash=item3b0228a8b8:g:h2kAAOSwBLlVdAsOHere's one