Automatic Stability Control; Trol - BMW C650GT Rider's Manual

the motorcycle's weight and
7
momentum take over and even
BMW Motorrad ABS is unable to
80
counteract their effects.
Automatic Stability
Control
How does ASC work?
BMW Motorrad ASC compares
the wheel speeds of the front
and rear wheels. Differences in
the relative rotation speeds al-
low the system to determine the
slip rate, and thus the stability re-
serves at the rear wheel. The en-
gine management system adapts
the engine torque when the slip
z
limit is exceeded.
Special situations
As lean angles increase, accel-
eration potential is also progres-
sively restricted by the laws of
physics. This can result in de-
layed acceleration when coming
out of very tight curves.
The system compares the rota-
tion speeds of the front and rear
wheels to detect any tendency
for the rear wheel to spin or lose
traction. If the system registers
implausible data for an extended
period of time it will deactivate
the ASC functionality as safety
precaution and a display will alert
you to an ASC error. A self-diag-
nosis routine must be completed
before the error will be displayed.
Driving on the rear wheel (per-
forming Wheelies) for an ex-
tended period may cause the
ASC of the BMW Motorrad to
switch off automatically.
If the front wheel loses contact
to the ground during extreme
acceleration, the ASC reduces
the engine torque until the front
wheel touches the ground again.
BMW Motorrad recommends
that you respond to this condi-
tion by twisting back the throttle
grip somewhat to return to stable
dynamic operating conditions as
quickly as possible.
On smooth surfaces never com-
pletely twist the throttle grip back
in an abrupt manner. The en-
gine's braking torque could cause
the rear wheel to lock, resulting
in unstable motorcycle condi-
tions. This case cannot be con-
trolled by BMW Motorrad ASC.
Slippery roads
On very loose surfaces (e.g. sand
or snow) the control interven-
tions of the ASC can reduce the
driving power at the rear wheel
to such a degree that the rear
wheel no longer turns sufficiently.
In this case, BMW Motorrad rec-
ommends switching off the ASC
temporarily.