BMW Motorcycle (R1100RT, R1100RS, R850/1100GS, R850/1100R). Manual - part 19

12.1

Contents

Page

12

Technical Data

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

Removing and installing coil and ignition lead 

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

Checking ignition coil resistance

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

Removing and installing alternator 

....................................................................................8

Adjusting procedure for Poly-V belt:  ....................................................................................................9

Dismantling/reassembling alternator 

..............................................................................10

Checking alternator

 ......................................................................................................................11

Checking armature for short to ground (earth)

 ................................................................11

Removing and installing starter motor 

...........................................................................12

Dismantling/reassembling starter motor 

......................................................................13

Renewing carbon brushes

 ........................................................................................................13

Checking starter motor

 ..............................................................................................................13

Checking starter relay

 .................................................................................................................13

Removing and installing magnetic gate 

........................................................................14

Timing the ignition

 ........................................................................................................................15

12 Engine electrics

12.2

12.3

12

Technical Data

R 1100 RS

Starter motor

Type

Permanent-magnet motor with planetary gear 
drivee

Gear ratio

Planetary gears 5,5 : 1

Power rating

kW

1,1

Alternator

Type

Three-phase alternating-current generator with 
integrated all-electronic voltage regulator

Drive

Poly-V belt

Gear ratios

1 : 1,5

Maximum output rating

W/V

700/14

Maximum current at engine speed 4000 min

-1

A

50

Nominal current at engine speed 1000 min

-1

A

18

Max. operating speed

min

-1

20 000

Aluminum Poly-V belt pulley

Extl. dia., measured at tips of teeth

Wear dimension

mm (in)

Spark plug

Bosch

FR 6 DDC

Electrode gap

mm (in)

0,8 (0.0315)

Wear limit

mm (in)

1,0 (0.0394)

Thread

metric

M 14 x 1,25

Ignition

Ignition system

Motronic (mapped characteristic control)

Ignition trigger

Two magnetic gates (Hall-effect transmitters) 
driven from crankshaft

Ignition timing

°KW

0° — + 43° before TDC

Static ignition timing

°KW

Adjustment at TDC

Motronic converts TDC value into 6° before TDC

Ignition coil

Twin-spark coil

Resistance: Primary,

Ω

~

0,5

between terminals 15 and 1

Secondary,

k

Ω

~

13

between terminals 4a and 4b

12.4

Technical Data

R 1100 RT

Starter motor

Type

Permanent-magnet motor with planetary gear 
drive

Gear ratio

Planetary gears 5,5 : 1

Power rating

kW

1,1

Alternator

Type

Three-phase alternating-current generator with 
integrated all-electronic voltage regulator

Drive

Poly-V belt

Gear ratios

1 : 1,5

Maximum output rating

W/V

700/14

Maximum current at engine speed 4000 min

-1

A

50

Nominal current at engine speed 1000 min

-1

A

18

Max. operating speed

min

-1

20 000

Aluminum Poly-V belt pulley

Extl. dia., measured at tips of teeth

Wear dimension

mm (in)

Spark plug

Bosch

FR 6 DDC

Electrode gap

mm (in)

0,8 (0.0315)

Wear limit

mm (in)

1,0 (0.0394)

Thread

metric

M 14 x 1,25

Ignition

Ignition system

Motronic (mapped characteristic control)

Ignition trigger

Two magnetic gates (Hall-effect transmitters) 
driven from crankshaft

Ignition timing

°KW

0° — + 43° before TDC

Static ignition timing

°KW

Adjustment at TDC

Motronic converts TDC value into 6° before TDC

Ignition coil

Twin-spark coil

Resistance: Primary,

Ω

~

0,5

between terminals 15 and 1

Secondary,

k

Ω

~

13

between terminals 4a and 4b

12.5

Technical Data

R 850 GS

R 1100 GS

Starter motor

Type

Permanent-magnet motor with planetary gear 
drive

Gear ratio

Planetary gears 5,5 : 1

Planetary gears 5,5 : 1

Power rating

kW 1,1

1,1

Alternator

Type

Three-phase alternating-current generator with 
integrated all-electronic voltage regulator

Drive

Poly-V belt

Poly-V belt

Gear ratios

1 : 1,5

1 : 1,5

Maximum output rating

W/V 700/14

700/14

Maximum current at engine speed 4000 min

-1

A 50

50

Nominal current at engine speed 1000 min

-1

A 18

18

Max. operating speed

min

-1

20 000

20 000

Aluminum Poly-V belt pulley

Extl. dia., measured at tips of teeth

Wear dimension

mm (in)

55,5 (2.185)

Spark plug

Bosch

FR 6 DDC

FR 6 DDC

Electrode gap

mm (in) 0,8 (0.0315)

0,8 (0.0315)

Wear limit

mm (in) 1,0 (0.0394)

1,0 (0.0394)

Thread

metric M 14 x 1,25

M 14 x 1,25

Ignition

Ignition system

Motronic (mapped characteristic control)

Ignition trigger

Two magnetic gates (Hall-effect transmitters) 
driven from crankshaft

Ignition timing

°KW 0° — + 43° before TDC

0° — + 43° before TDC

Static ignition timing

°KW Adjustment at TDC

Adjustment at TDC

Motronic converts TDC value to 6° before TDC

Ignition coil

Twin-spark coil

Resistance: Primary,

Ω

~

0,5

~

0,5

between terminals 15 and 1

Secondary,

k

Ω

~

13

~

13

between terminals 4a and 4b

12.6

Technical Data

R 850 R

R 1100 R

Starter motor

Type

Permanent-magnet motor with planetary gear 
drive

Gear ratio

Planetary gears 5,5 : 1

Planetary gears 5,5 : 1

Power rating

kW 1,1

1,1

Alternator

Type

Three-phase alternating-current generator with 
integrated all-electronic voltage regulator

Drive

Poly-V belt

Poly-V belt

Gear ratios

1 : 1,5

1 : 1,5

Maximum output rating

W/V 700/14

700/14

Maximum current at engine speed 4000 min

-1

A 50

50

Nominal current at engine speed 1000 min

-1

A 18

18

Max. operating speed

min

-1

20 000

20 000

Aluminum Poly-V belt pulley

Extl. dia., measured at tips of teeth

Wear dimension

mm (in) 55,5 (2.185)

55,5 (2.185)

Spark plug

Bosch

FR 6 DDC

FR 6 DDC

Electrode gap

mm (in) 0,8 (0.0315)

0,8 (0.0315)

Wear limit

mm (in) 1,0 (0.0394)

1,0 (0.0394)

Thread

metric M 14 x 1,25

M 14 x 1,25

Ignition

Ignition system

Motronic (mapped characteristic control)

Ignition trigger

Two magnetic gates (Hall-effect transmitters) 
driven from crankshaft

Ignition timing

°KW 0° — + 43° before TDC

0° — + 43° before TDC

Static ignition timing

°KW Adjustment at TDC

Adjustment at TDC

Motronic converts TDC value to 6° before TDC

Ignition coil

Twin-spark coil

Resistance: Primary,

Ω

~

0,5

~

0,5

between terminals 15 and 1

Secondary,

k

Ω

~

13

~

13

between terminals 4a and 4b

12.7

Removing and installing coil and 
ignition lead

•

Remove dualseat.

•

[RS/GS/RT] Remove side sections of fairing.

•

[RS] Remove inner fairing panel at fuel tank.

•

[R] Remove tank cover.

•

Unscrew fuel tank mount.

•

Seal, loosen and pull off fuel feed and return line 
with hose clip BMW No. 13 0 010.

•

Remove vent pipes.

•

Separate plug for fuel pump.

•

Remove fuel tank.

e

 

Caution:

Switch off ignition. Disconnect ground (earth) cable 
at battery and insulate it.

•

[GS/R] Detach Motronic control unit and pull it 
out upwards.

•

Remove ignition coil (1).

•

Separate plug connector (2).

•

Pull off ignition lead (3).

•

Remove spark plug cover (4).

•

Remove plug cap (5) with puller, 
BMW  No. 12 3 520.

•

Remove ignition lead.

•

Install in the reverse order of work.

Checking ignition coil resistance

a

See Technical Data.

12 3 520

4

5

1

2

3

3

5

RS120010

12.8

Removing and installing alternator

•

Remove dualseat.

•

[RS/GS/RT] Remove side sections of fairing.

e

  Caution:

Disconnect ground (earth) lead from battery. Insu-
late ground (earth) lead.

•

[RS] Remove inner fairing panel at fuel tank.

•

[R] Remove fuel tank cover.

•

Unscrew fuel tank mount.

•

Seal, loosen and pull off fuel feed and return line 
with hose clip, BMW No. 13 0 010.

•

Remove vent pipes.

•

Separate plug for fuel pump.

•

Remove fuel tank.

•

Remove Motronic control unit.

•

[ABS] - detach pressure modulator.

•

Remove front cover from engine.

•

Detach connecting leads (1) from alternator.

•

Loosen Poly-V belt pulley at alternator.

•

Unscrew alternator mount (2).

•

Take off Poly-V belt pulley and belt.

•

Remove strut (3) from frame at left.

•

Remove alternator.

e

  Caution:

Do not scratch other parts; disconnect if necessary.

•

Install in the reverse order of work.

2

2

2

1

3

RS120020