2007 BMW MOTORRAD G 650 XCHALLENGE wheel

adjusting screw in the+direc-
tion.
If you want softer damping, use
a screwdriver to turn the ad-
justing screw in the - direction.
Compression stage, basic
setting, front
Turn adjusting screw as far
as it will go in the "+" dir-
ection, then back it off 11
clicks in the "-" direction.Adjustment for rear
suspensionThe Air Damping System has
two settings so that it can be ad-
justed to suit the type of surface
on which you intend riding.
You can turn the adjusting screw
any distance in either direction.
Adjusting damping for
rear wheelMake sure the ground is level
and firm and place the motor-
cycle on its stand.
Turn adjusting screw1to the
horizontal position.
Strong damping characteristic,
adjusting screw engages with
an audible click.
Turn adjusting screw1to the
vertical position.
Weak damping characteristic,
adjusting screw engages with
an audible click.
TyresChecking tyre pressureMake sure the ground is level
and firm and place the motor-
cycle on its stand.
Incorrect tyre pressures im-
pair the motorcycle's hand-
ling characteristics and increase
the rate of tyre wear.
Always check that the tyre pres-
sures are correct.
At high road speeds, tyre
valves have a tendency to
open as a result of centrifugal
force.
Fit metal valve caps with rubber
seals and screw them on firmly
to prevent sudden deflation.
Check tyre pressures against
the data below.
Tyre pressure, front
1.8 bar (one-up, tyre cold)
440zOperation

If a warning light or telltale light
did not show as specified above
or if a segment or segments of
the multifunction display failed to
light up:
Some malfunctions cannot
be indicated if one of the
warning lights fails to show.
Make sure that all the warning
and telltale lights come on in the
pre-ride check.
Have the fault rectified as
quickly as possible by a
specialist workshop, preferably
an authorised BMW Motorrad
dealer.ABS self-diagnosis
OE
BMW Motorrad ABS performs
self-diagnosis to ensure its op-
erability. Self-diagnosis is per-
formed automatically when you
switch on the ignition. The mo-
torcycle has to move forward afew metres for the wheel sensors
to be tested.
Phase 1
Test of the diagnosis-compat-
ible system components with
the motorcycle at a standstill.
ABS warning light flashes.
Phase 2
Test of the wheel sensors as
the motorcycle pulls away from
rest.
ABS warning light flashes.
ABS self-diagnosis
completed
The ABS warning light goes
out.
If an indicator showing an ABS
fault appears when ABS self-dia-
gnosis completes:You can continue to ride. Bear
in mind that the ABS function
is not available.
Have the fault rectified as
quickly as possible by a
specialist workshop, preferably
an authorised BMW Motorrad
dealer.
Running inThe first 1000 kmWhile running in the motor-
cycle, vary the throttle opening
and engine-speed range fre-
quently.
Try to do most of your rid-
ing during this initial period on
twisting, fairly hilly roads, avoid-
ing high-speed main roads and
highways if possible.
Exceeding the specified en-
gine speeds while running
in will lead to increased engine
wear.
548zRiding

pads more frequently and replace
the brake pads in good time.Air pressure and damping
characteristics
The off-road settings for air
pressure in the Air Damping
System and the front and rear
shock-absorber damping char-
acteristics will impair the motor-
cycle's handling characteristics
on surfaced roads.
If you have been off-roading, re-
member to correct the air pres-
sure in the Air Damping System
and the shock-absorber damping
characteristics before you return
to surfaced roads.
Deactivatable ABS
OE
You can deactivate the BMW
Motorrad Integral ABS for off-
roading ( 33).
BrakesHow can stopping
distance be minimised?Each time the brakes are applied,
a load distribution shift takes
place with the load shifting for-
ward from the rear to the front
wheel. The sharper the motor-
cycle decelerates, the more load
is shifted to the front wheel. The
higher the wheel load, the more
braking force can be transmitted
without the wheel locking.
To optimise stopping distance,
apply the front brakes rapidly and
keep on increasing the force you
apply to the brake lever. This
makes the best possible use
of the dynamic increase in load
at the front wheel. Remember
to pull the clutch at the same
time. In the "panic braking situ-
ations" that are trained so fre-
quently braking force is applied
as rapidly as possible and withthe rider's full force applied to
the brake levers; under these cir-
cumstances the dynamic shift
in load distribution cannot keep
pace with the increase in de-
celeration and the tyres cannot
transmit the full braking force to
the surface of the road. ABS has
to intervene to keep the front
wheel from locking; this increases
stopping distance.
Descending mountain
passes
There is a danger of the
brakes fading if you use
only the rear brakes when des-
cending mountain passes. Under
extreme conditions, the brakes
could overheat and suffer severe
damage.
Use both front and rear brakes,
and make use of the engine's
braking effect as well.
550zRiding

Brake system with
BMW Motorrad ABS
OE
How does ABS work?The amount of braking force that
can be transferred to the road
depends on factors hat include
the coefficient of friction of the
road surface. Loose stones, ice
and snow or a wet road all have
much lower coefficients of fric-
tion than a clean, dry asphalt sur-
face. The lower the coefficient
of friction, the longer the braking
distance.
If the rider increases braking
pressure to the extent that brak-
ing force exceeds the maxim-
um transferrable limit, the wheels
start to lock and the motorcycle
loses its directional stability; a fall
is imminent. Before this situation
can occur, ABS intervenes and
adapts braking pressure to the
maximum transferrable braking
force, so the wheels continueto turn and directional stability
is maintained irrespective of the
condition of the road surface.
What are the effects of
surface irregularities?Humps and surface irregularit-
ies can cause the wheels to lose
contact temporarily with the road
surface; if this happens the brak-
ing force that can be transmit-
ted to the road can drop to zero.
If the brakes are applied under
these circumstances the ABS
has to reduce braking force to
ensure that directional stability
is maintained when the wheels
regain contact with the road sur-
face. At this instant the BMW
Motorrad ABS must assume an
extremely low coefficient of fric-
tion, so that the wheels will con-
tinue to rotate under all imagin-
able circumstances, because this
is the precondition for ensuring
directional stability. As soon asis registers the actual circum-
stances, the system reacts in-
stantly and adjusts braking force
accordingly to achieve optimum
braking.
Rear wheel liftEven under severe braking, a
high level of tyre grip can mean
that the front wheel does not
lock up until very late, if at all.
Consequently, ABS does not in-
tervene until very late, if at all.
Under these circumstances the
rear wheel can lift off the ground,
and the outcome can be a high-
siding situation in which the mo-
torcycle can flip over.
Severe braking can cause
the rear wheel to lift off the
ground.
When you brake, bear in mind
that ABS control cannot be relied
on in all circumstances to prevent
the rear wheel from lifting clear of
the ground.
656zEngineering details

What is the design
baseline for BMW
Motorrad ABS?Within the limits imposed by
physics, BMW Motorrad ABS en-
sures directional stability on any
surface. The system is not op-
timised for special requirements
that apply under extreme com-
petitive situations off-road or on
the track.Special situationsThe speeds of the front and rear
wheels are compared as one
means of detecting a wheel's
incipient tendency to lock. If the
system registers implausible val-
ues for a lengthy period the ABS
function is deactivated for safety
reasons and an ABS fault mes-
sage is issued. Self-diagnos-
is has to complete before fault
messages can be issued.
In addition to problems with the
BMW Motorrad ABS, exceptionalriding conditions can lead to a
fault message being issued.
Exceptional riding
conditions:
Riding for a lengthy period with
the front wheel lifted off the
ground (wheelie).
Rear wheel rotating with the
motorcycle held stationary by
applying 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.
Rear wheel locked for a lengthy
period, for example while des-
cending off-road.
If a fault message is issued on
account of exceptional riding
conditions as outlined above, you
can reactivate the ABS function
by switching the ignition off and
on again.
What significance
devolves on regular
maintenance?
Invariably, a technical sys-
tem cannot perform beyond
the abilities dictated by its level
of maintenance.
In order to ensure that the BMW
Motorrad ABS is always main-
tained in optimum condition, it
is essential for you to comply
strictly with the specified inspec-
tion intervals.
Reserves for safetyThe potentially shorter braking
distances which BMW Motorrad
ABS permits must not be used
as an excuse for careless riding.
ABS is primarily a means of en-
suring a safety margin in genuine
emergencies.
Take care when cornering. When
you apply the brakes on a corner,
the motorcycle's weight and
657zEngineering details

Maintenance
Maintenance
Notes................................ 64
Toolkit . . ............................. 64
Engine oil............................ 65
Brake system ........................ 67
Brake pads . . ........................ 68
Brake fluid........................... 69
Coolant . ............................. 71
Clutch . . ............................. 72
Tyres................................ 73
Rims................................. 73
Chain................................ 73
Wheels . ............................. 75
BMW Motorrad auxiliary stand....... 81
BMW Motorrad front-wheel
stand................................ 82Fuses . . .............................. 84
Bulbs . . .............................. 86
Air filter .............................. 92
Jump starting ........................ 95
Battery . .............................. 96
Number-plate carrier............... 100
863zMaintenance

10 Screwdriver, small
Replacing turn indicator bulbsOn-board toolkit service
kitYour authorised BMW Motor-
rad dealer can provide the on-
board toolkit service kit that you
will need if you are considering
undertaking more extensive work.
You will find information on un-
dertaking work of this nature in
the Repair Manual on the CD or
DVD also obtainable from your
authorised BMW Motorrad deal-
er.1 Extending tool holder
Adapters to accommodate all
tools
Removing and installing spark
plugs
2 1/4" bits
Star-head
Plain-tip
Adapter, 1/4" hex to 1/4"square
2x hexagon socket wrench in-
sert
Allen keys, 3 mm, 4 mm and
6mm3 Ring spanner, w/f 26
Removing and installing wheels
4 Electric torch
LED bulb
5 3x socket
Adjusting chain tension
6 Adapter
Adapter for 1/4" bits
9x12 mm and 3/8" swivel ad-
apters
Engine oilChecking engine oil level
The engine can seize if the
oil level is low, and this can
lead to accidents.
Always make sure that the oil
level is correct.
The oil level varies with the
temperature of the oil. The
higher the temperature, the high-
er the level of oil in the sump.
865zMaintenance

Checking operation of
brakesPull the handbrake lever.
The pressure point must be
clearly perceptible.
Press the footbrake lever.
The pressure point must be
clearly perceptible.
If pressure points are not clearly
perceptible:
Have the brakes checked by a
specialist workshop, preferably
an authorised BMW Motorrad
dealer.
Brake padsChecking front brake pad
thickness
Brake pads worn past
the minimum permissible
brake-pad thickness can cause
a reduction in braking efficiency
and under certain circumstances
they can cause damage to the
brake system.
In order to ensure the dependab-
ility of the brake system, do not
permit the brake pads to wear
past the minimum permissible
brake-pad thickness.Visually inspect the brake pads
to ascertain their thickness.
Viewing direction: Between
wheel and fork tube toward the
brake caliper.
Brake-pad wear limit,
front
min 1 mm (Friction pad only,
without backing plate)
The wear indicators
(grooves) must be clearly
visible.
868zMaintenance