BMW F 800 GS Rider's Manual page 129

If the measured value is outside
the approved tolerance:
Adjusting chain sag (
Adjusting chain sag
Make sure ground is level and
firm and park motorcycle.
Loosen quick-release axle
nut 1.
Loosen lock nuts 2 on left and
right.
Adjust chain sag with adjusting
screws 3 on left and right.
Check chain sag (
Ensure that the figures 4 indi-
cating the adjustment settings
are identical on left and right.
127).
Tighten locknuts 2 on left and
right with appropriate torque.
Locknut of drive-chain
tensioning screw
14 lb/ft (19 Nm)
Tighten quick-release axle
nut 1 to specified torque.
Rear-wheel quick-release
axle in swinging arm
74 lb/ft (100 Nm)
Check chain wear
Make sure ground is level and
firm and park motorcycle.
Engage 1st gear.
Rotate rear wheel toward front
of vehicle until the chain is ten-
sioned.
126).
Determine chain length below
the rear wheel swinging arm
with 9 rivets.
Permissible chain length
max 5.7 in (max 144.30 mm)
(Measured over the center of
10 rivets, chain tensioned)
If the chain has reached the max-
imum approved length:
Contact an authorized service
facility, preferably an authorized
BMW Motorrad dealer.
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