BMW R1200GS Rider's Manual page 108

Even ASC is constrained by
6
the laws of physics. Invari-
ably, the rider bears responsibil-
106
ity for assessing road and traffic
conditions and adopting his or
her style of riding accordingly.
Do not take risks that would neg-
ate the additional safety offered
by this system.
Special situations
In accordance with the laws of
physics, the ability to accelerate
is restricted more and more as
the angle of heel increases. Con-
sequently, there can be a per-
ceptible lag in acceleration out of
z
very tight bends.
The speeds of the front and
rear wheels are compared as
one means of detecting the rear
wheel's incipient tendency to
spin or slip sideways. If the sys-
tem registers implausible values
for a lengthy period, the ASC
function is deactivated for safety
reasons and an ASC fault mes-
sage is issued. Self-diagnosis
has to complete before fault
messages can be issued.
The following exceptional
riding conditions can lead to
an automatic shutdown of the
BMW Motorrad ASC:
Riding for a lengthy period with
the rear wheel lifted off the
ground (wheelie) with ASC de-
activated
Rear wheel rotating with the
vehicle held stationary by ap-
plying the front brake (burn-
out)
Heating up with the motorcycle
on the centre stand or an auxil-
iary stand, engine idling or with
a gear engaged
Accelerating the motorcycle to
a speed in excess of 10 km/h
after switching the ignition off
and then on again reactivates the
ASC.
Slip can be increased by
very-heavy-duty massive-bar
tyres, with the result that ASC
intervention occurs before
optimum forward acceleration
is achieved. Under these
circumstances, BMW Motorrad
ASC should be deactivated.
If the front wheel lifts clear of the
ground under severe accelera-
tion, ASC reduces engine torque
until the front wheel regains con-
tact with the ground.
Under these circumstances,
BMW Motorrad recommends
rolling the throttle slightly closed
so as to restore stability with the
least possible delay.