Shiftcam - BMW R 1250 GS Adventure Rider's Manual

176 ENGINEERING DETAILS
If the motorcycle is stopped
by the application of high
brake pressure, high holding
pressure is built up. In this
case, the brakes take longer
to release when driving off.
More torque is required for
driving off which also requires
the rider to turn the throttle
grip again.
Behaviour when the
motorcycle rolls or slips
If the vehicle starts to roll
while Hill Start Control is act-
ive, holding pressure is in-
creased.
If the rear wheel slips, the
brake is released again after
approx. 1 m. This prevents
the vehicle slipping with a
locked rear wheel, for ex-
ample.
Releasing the brake when
stopping the engine
Hill Start Control is deactivated
if the rider stops the engine
by hitting the emergency-off
switch (kill switch) or when the
side stand is extended.
In addition to the indicator and
warning lights, the rider should
be made aware that Hill Start
Control has been deactivated
by the following behaviour:
Brake warning jolt
The brake is released briefly
and reactivated immediately.
This creates a jolt which the
rider feels.
The brake is released slowly.
The motorcycle is not braked.
The rider must brake the mo-
torcycle manually.
The holding pressure
is released immediately
without a brake warning jolt as
soon as the ignition is switched
off.

SHIFTCAM

Functional principle of
ShiftCam
The vehicle features BMW
ShiftCam technology for
varying valve timing and valve
lift on the intake side. The
heart of this technology is
a one-piece shifting intake
camshaft that has two lobes
for each valve: a partial-load
cam and a full-load cam. The
partial-load cam is fine-tuned
for consumption optimisation
and engine smoothness. As
well as adapting valve timing,
the partial-load cam also
reduces intake-valve lift. With
the partial-load cams activated,
moreover, the lobes for the
cylinder's left and right intake