Just crossed Africa on 85 and 89 Tenere with the following toolkit. The toolkit excludes the big sized sockets needed to take the engine apart (crankshaft nut etc).
I did have anything I needed.
phillips small and medium
'normal' small and medium
Small adjustable spanner (must fit to rear axle bolt)
10, 12, 13 mm open ended / ring
sockets 10, 12, 14, 17, 19, 22
check what you need
two irons 40 cm (can be shorter)
1/2 hacksaw blade for roughing up
1 small digital multimeter
1 spoke key - check required size(s)
Small hacksaw with blades
Small hammer 200 grams (also useful for tentpegs)
feeler gauges 0.1, 0.15 (valve clearances), 0.9 (spark plug)
spark plug spanner
We did not carry a chain breaker as we had spare chains and sprockets.