Basic kit includes:-
3 Spanners that cover 10, 11, 12, 13, 14, 17mm Â
21 X 22 Box Spanner  (axle nuts and spark plugs)
4, 5, 6, 8 mm Allen Keys
Plain and philips screw drivers
Feeler gauge set Metric or Imperial according to how your brain was programmed as youth (mine is imperial)
The factory kit also includes pliers but they would be rarely needed
There is an odd sized nut that clamps the choke cable which you will need to remove carbs. Â I think it's 7 mm
I'm sure others will add to the list
Here's a link to the more comprehensive tool kits supplied with the earlier mainstream airheads Â
http://w6rec.com/duane/bmw/toolkit/index.htm