Engine start and battery charging system of motorcycle BMW R1150GS (1999-2004)

Engine electric specification
Technical Data R1150GS 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...

Removing and installing coil and ignition lead
Remove the seat. Remove right side trim panel. Disengage fuel tank. Seal the fuel feed and return lines with hose clips, BMW No. 13 0 010, and disconnect. Disconnect breather lines. Disconnect plug for fuel pump. Remove fuel tank. Caution! Switch...

Removing and installing alternator
Remove the seat. Remove side panel. Caution! Disconnect earth (ground) lead from battery. Insulate earth (ground) lead. Disengage fuel tank. Seal the fuel feed and return lines with hose clips, BMW No. 133010, and disconnect. Disconnect breather...

Disassembling/assembling alternator
Remove the cover retaining screws (1). Unscrew nut (2) and remove sleeve (3). Remove the cover. Remove voltage regulator (4). Installation is the reverse of the removal procedure. Note: The belt pulley cannot be removed. Checking alternator Test...

Disassembling/assembling alternator (option 50 A)
Remove the cover retaining screws (1). Release clips (2) and remove the cover. Remove voltage regulator (3). Remove the Poly-V belt pulley. Installation is the reverse of the removal procedure. Tightening torque: Belt pulley to alternator — 50 Nm...

Removing and installing starter motor
Remove the seat. Caution! Disconnect earth (ground) lead from battery. Insulate earth (ground) lead. Remove cover (1) for the starter motor and disconnect cable (2) for the power socket. Disconnect lead (3). Remove securing screws (4) and remove the...

Disassembling/assembling starter motor
Disconnect leads (1). Remove securing screws (2). Remove flange (3). Remove solenoid switch (4) after taking out the retaining screws (5). Remove release lever (6) and spring (7) from solenoid switch (8). Fit a socket of correct size, tap it lightly...

Removing and installing magnetic gate
Remove the seat. Disengage fuel tank. Pull fuel tank to the rear and support it at the front with a piece of wood or similar. Caution! Avoid scratching components, for instance by inserting a piece of cloth between the fuel tank and the frame....