www.afam.co.jp/E/index2.htm
the ones listed for the Suzuki GSX750 will bolt right on your 650. I was looking for one for my 750 and found that page, but I want to go with 520 chain so I guess I'll have to make my own.
The stock 1000 is a 630 sprocket (it will fit the shaft though) and unless your 650 is 81 or newer it had a 530 stock.