Only hope you got is going to the Honda importers and asking them to ask Honda,
I can do it here in UK for a cost of £35 (last time i did it) if i have the full frame number, Honda have no record of engine numbers, type or colours used on any particular frame.
According to the US ID guide All 650 79-83 have engine numbers starting RC03E-2******
And frame numbers RC03-79-80 with 81/82 starting JH2rc***-*M*****