Where are you located, I own a locksmith shop and maybe able to help.

Try removing the sub tank lock off the bracket and see if there is a code on the back of it, I'll check and see what I can find, unless someone else chimes in.

Cheers,

David

Some of my bikes, past and present.
1981 Honda CT110 
1980 Suzuki GS1000ST Blue & White, X2

2012 Suzuki DL650 Vstrom Foxy Orange, Daily Ride
2007 Suzuki GS500F - Silver (wife's bike)
2002 BMW 1150 GS Blue & White - Sold
1975 BMW R90/6 Black - Sold 1984 Suzuki GS1150EF Sold
1982 BMW R100 Africa trip, Stolen - Recovered- Sold
1977-1980 Suzuki GS550, GS750's GS1000, GS1000E, GS 1000S GSX750, GSX1100, etc, Racing Years
Hondas ST90, CR125 CB175 , CB350 CB750, NSU Quickly, Yamaha RD's 350/400,