With motor disassembly (Slack chain) - 150 000 km, and bike sold on 187 000 km without problem with engine.
==English Subtitles==

Timecodes:
00:00 - Introduction / Dismantling the motorcycle
00:46 - Oil pan
01:19 - Crankcase cover
02:22 - Clutch cover
03:05 - Alternator cover
03:28 - Cylinder head cover / camshafts
04:47 - Drive gear / Tube heat exchanger / Starter
05:22 - Engine
06:14 - Crankshaft / CAM chain
07:04 - Balance rod
08:12 - Cleaning from the sealant
08:55 - Preparing for assembly / Sealant
10:00 - Assembling
11:03 - Drive shaft oil seal
11:41 - Clutch cover
12:33 - Camshafts
14:13 - Starter
14:30 - Generator cover / Starter gears
14:52 - Crankcase
16:00 - Check CAM
16:53 - Valve cover
17:34 - Removal from the "slipway"/"tumbler"
17:57 - Tube heat exchanger
18:42 - Spare parts / prices / tools
19:30 - Resume / Motor installation

A short story on replacing CAM chain on the F800GS Adventure
Also applicable for other BMW's Rotax engines in 2008-2018
BMW F700GS
BMW F800GS
BMW F800R

Spare parts (RUS):
https://docs.google.com/spreadsheets/...
3D model (AutoCAD) of the "slipway"/"tumbler": https://github.com/bj-/Hardware/tree/...