BMW G 650 Xchallenge Rider's Manual page 37

pression of a trapped volume of
air.
The Air Damping System is ad-
justed to the driver and load in
accordance with the suspension
preload by changing its air pres-
sure. The air pressure can be
reduced with the valve on the Air
Damping System or increased
using the air pump.
Level indicator
A level indicator similar in func-
tion and appearance to the bub-
ble on a level is mounted on
the motorcycle. The suitable air
pressure is achieved when the
level indicator is horizontal with
the rider and the desired load.
The air pressure should always
be checked before driving off.
Adjusting air pressure
The air pressure in the Air
Damping System must be
adjusted to the loading of the
motorcycle. Increase the air
pressure when the motorcycle is
heavily loaded and reduce the air
pressure accordingly when the
motorcycle is lightly loaded.
To read the level indicator, the
rider sits on the motorcycle so
that he/she balances out the mo-
torcycle with his/her feet, how-
ever his/her weight rests on the
motorcycle as much as possible.
BMW Motorrad recommends
selecting the air pressure in the
Air Damping System somewhat
higher than required by the
weight of the rider and load to be
expected. Then the air pressure
can be reduced while sitting on
the motorcycle.
Air pressure and
temperature
When the Air Damping System is
heavily loaded, the air enclosed in
it heats up. This leads to a vol-
ume increase, and with it to an
increase in the motorcycle height
- an effect which is very practical
for offroad riding. To ensure cor-
rect air pressure, the air pressure
may only be checked and adjust-
ed with the Air Damping System
cold, i.e. not directly following
offroad use.
In case of very great heating up
due to extreme loading of the
system, the increase in the mo-
torcycle height can result in to
uncomfortable handling. In these
special cases, the motorcycle
height should be balanced out
again by bleeding air and using
the level gauge ( 35). The mo-
torcycle must then be balanced
out again after the system has
cooled down.
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