Back to the X5:

after 6500km I had a look at the valve clearance.
As I don't have X5 details for this subject so I took the figures from XR400 manual. It says inlet valve = 0.10 +/- 0.02 and exhaust valves = 0.12 +/- 0.02.
That have been the figures I found on my bike, except one exhaust valve had 0.15 and needed correction.
To find the right piston position do exactly the same as procedure as described for the XR400.

BTW:
I confirm once more the fuel tank capa: 16L (I had it totally empty)
But I also found that the reserve indicator leaves you only 2.5 to 3L!