I have a new in shrink wrap, case hardened steel sprocket, 514-18, from WWW.sprocketspecialists.com that fits an 800 Drifter & Vulcan, KZ750 & 650, ZX750 Ninja, ZX-7, ZX-9, ZZR600ZX600. It may fit other bikes but check the web site to be sure. $25 shipped to lower 48. Email if interested:
Clem@ptmc.net

I bought the sprocked when I had an 800 Drifter in order to get lower RPM at cruising speed. Just never got around to installing it and later sold the Drifter.