BMW AG Motorcycle (R 850 C, R 1200 C). Manual - part 13

12.9

Dismantling/reassembling starter 
motor

•

Detach lead (1).

•

Remove retaining screws (2).

•

Remove flange (3).

•

Remove solenoid switch (4) after taking out the 
retaining screws (5).

•

Remove release lever (6) and spring (7) from so-
lenoid switch (8).

•

Remove retaining ring (9) and take starter motor 
gear assembly (10) off shaft.

•

Install by following the above work instructions in 
the reverse order.

•

Coat the helical thread and pull-in ring with 
grease.

Lubricant:......................... Bosch PZ 2 V 3 silicone 

 grease 

or 

equivalent

Renewing carbon brushes

•

Detach lead (1).

•

Remove cover (11).

•

Remove holder (12) for carbon brushes.

•

Lift up retaining springs (13) and remove carbon 
brushes (14).

•

Install carbon brushes with retaining plate.

•

Slide short lead (15) on to threaded pin.

•

Install cover (11).

•

Attach lead (1).

Checking starter motor

•

Test with MoDiTeC.

Checking starter relay

•

Test with MoDiTeC.

RS120080

9

15

13

11

10

2

5

8

7

4

14

6

1

3

12

12.10

Removing and installing magnetic 
gate

•

Remove seat.

•

Unscrew fuel tank mount.

•

Pull fuel tank to the rear and support it at the front 
with a piece of wood or similar.

e

 Caution:

Avoid scratching any components, for instance by 
inserting a piece of cloth between the fuel tank and 
the frame.

•

Remove the horn with its holder.

•

Remove front cover from engine.

•

Unscrew alternator mount (1).

•

Remove rotary breather tube (2).

•

Remove Poly-V belt (3).

e

 Caution:

Disconnect ground (earth) lead from battery.
Insulate the ground (earth) lead!

•

Remove the starter motor.

•

Lock clutch housing with special tool 
BMW No. 11 5 640.

•

Remove Poly-V belt pulley (4) with rotor gate at 
crankshaft.

•

Separate the plug connection for the magnetic 
trigger in the central electrical equipment box.

L

 Note:

If necessary, mark position of magnetic trigger for 
later installation.

•

Remove magnetic trigger (5).

•

Install in reverse order of work.

•

Attach rotor (6) of Hall-effect gate with 
adhesive to the Poly-V belt pulley (4).

Adhesive: ..... Loctite instant adhesive or equivalent

e

 Caution:

Install retainer for Hall-effect rotor at groove/crank-
shaft (7).
Carefully dismantle magnetic trigger lead. Tension 
Poly-V belt according to installation procedure.

X 

Tightening torque:

Pre-tension of Poly–V belt .............................. 8 Nm
Alternator to alternator mount cover............. 20 Nm
Belt pulley to crankshaft ............................... 50 Nm

RS120090

3

2

4

6

5

7

1

12.11

Timing the ignition

•

Screw dial gauge holder, BMW No. 00 2 650, 
and dial gauge, BMW No. 00 2 510, into right or 
left spark plug hole.

•

Turn the engine over until the piston is at TDC.

•

Set the dial gauge pointer to zero.

•

Check the dial gauge reading.

•

Turn the engine over until the piston is at TDC.

•

The dial gauge pointer must be at zero.

•

Connect BMW MoDiTeC with adapter lead to 
the Hall-effect gate plate.

•

Adjust as stated in the tester guide.

00 2 650

C120040

13.1

Contents

Page

13

Technical data 

................................................................................................................................3

Removing and installing air cleaner 

...................................................................................5

Removing and installing throttle stub pipe 

....................................................................5

Removing and installing throttle potentiometer 

.........................................................5

Removing and installing throttle positioner 

..................................................................6

Removing and installing throttle potentiometer 

.........................................................6

Removing and installing injectors 

.......................................................................................6

Removing and installing Motronic control unit 

...........................................................7

13 Fuel preparation and control

13.3

13

Technical data

R 850 C

R 1200 C

Fuel grade

Super (premium), unleaded, 95 octane (RON)

Mixture preparation

Motronic MA 2.4

Throttle stub pipe intl. dia.

mm (in) 35 (1.38)

Throttle angle in rest position

depending on throttle positioner

Air cleaner

Flat-pattern paper element

13.5

Removing and installing air cleaner

a

See Group 46 (Removing/installing rear frame)

Removing and installing throttle 
stub pipe

•

Remove throttle stub pipe (1).

Removing and installing throttle 
potentiometer

•

Remove throttle potentiometer (2).

•

Adjusting throttle potentiometer with 
BMW MoDiTeC after installing

•

Mark screws with a paint spot.

C130010

2

3

1

13.6

Removing and installing throttle 
positioner

•

Remove the throttle positioner (3).

e

 Caution:

The throttle positioner operates at the control unit 
voltage of 5 V. It must not be connected directly to 
the motorcycle’s electrical system.

X 

Tightening torque:

Throttle positioner retaining screw
(clean thread + Loctite 2701)

Removing and installing throttle 
potentiometer

•

When a new throttle potentiometer is installed, it 
must be adjusted in accordance with the 
BMW MoDiTeC reading.

•

Mark the retaining screws (arrows) with a paint 
spot.

Removing and installing injectors

•

Press in the spring catch at the injector plug (1) 
and pull off the plug.

•

Unfasten retainer (2) for fuel pipe and pull off the 
pipe.

•

Remove injector.

•

Install by following the above work instructions in 
the reverse order.

e

 Caution:

The keeper (2) must be inserted from the inside out-
wards. It then prevents the injector from turning.
Make sure that the keeper (2) engages correctly.
Make sure that O-rings at the injector are in good 
condition.

KR130160

C130020

2

1

13.7

Removing and installing Motronic 
control unit

•

Remove fuel tank.

e

 Caution:

Switch off ignition; disconnect earth (ground) lead at 
battery and insulate it.

•

Remove Motronic control unit.

•

Remove connector strip.

•

Install by following the above work instructions in 
the reverse order.

C130030