1999–2004 BMW R 850 C / R 1200 C Factory Repair Manual (P/N 01 51 7 654 051)

This BMW AG Motorcycle Division repair manual covers the 1999–2004 BMW R 850 C and R 1200 C in standard condition or with Original BMW accessories, with maintenance, diagnostic, and mechanical repair procedures organized by construction group.

• Engine repair: Engine removal, crankcase dismantling, cylinder-head and valve-gear service, piston and bearing inspection, auxiliary-shaft work, and oil-pump disassembly.

• Fuel and ignition: Motronic MA 2.4 component replacement, throttle-potentiometer adjustment, synchronization checks, fuel-pressure testing, and Hall-effect ignition timing.

• Clutch and drivetrain: Dry-clutch replacement, slave-cylinder and hydraulic-line service, gearbox overhaul and shimming, plus crown-wheel and bevel-pinion setup.

• Telelever and wheels: Fork and leading-link repair, suspension-bearing checks, wheel-bearing replacement, wheel balancing, rim-runout measurement, and spoke service.

• Brakes and ABS: Caliper rebuilding, brake-line replacement, circuit bleeding, pressure-modulator removal, ABS relay service, and sensor-gap adjustment.

• Electrical equipment: Starter and alternator repair, Poly-V belt replacement and tensioning, instrument-cluster work, relay and fuse locations, and harness-routing views.

Written for workshop personnel, this manual supplements the practical and theoretical knowledge gained in BMW service training.

Engine Repair and Maintenance

The maintenance group connects BMW inspection routines with MoDiTeC fault-memory readout, filter and lubricant changes, valve checks, and final roadworthiness inspections. Rear-drive oil service includes cleaning the inductive signal transmitter.

Planning engine removal: The auxiliary shaft, timing chains, tensioner and guide rails, and crankshaft require engine removal. That distinction helps you determine whether a repair needs an engine-out setup before dismantling begins.

Cylinder-head coverage extends to valve-seat machining, guide replacement, and valve-stem seals. Crankshaft work includes radial and axial bearing measurements, bearing-shell identification, and assembly specifications.

The cam-chain section warns that incorrect reassembly order can let a tensioner piston fall into the left timing-chain cavity. Sectioned engine drawings and separate lubricating-oil and cooling-oil circuit illustrations support the mechanical procedures.

Motronic, Fuel Delivery, and Charging

Fuel-pump pressure testing uses gauge BMW No. 16 1 500. The accompanying fault checks direct attention to the pump, filter, pressure regulator, and lines when delivery pressure is low.

Throttle-positioner and throttle-potentiometer coverage addresses removal, replacement, and adjustment rather than internal overhaul. The potentiometer adjustment uses BMW MoDiTeC.

MoDiTeC also supports ignition-coil, alternator, starter, and relay checks, along with Hall-effect ignition timing. These operations rely on the specified tester and its guidance.

Gearbox, Clutch, and Final Drive

Gearbox coverage includes input-, output-, and intermediate-shaft disassembly, selector mechanisms, endplay checks, and shimming. Measuring fixtures and adjustment methods are documented, including measuring stand BMW No. 23 4 761.

The output-shaft seal instructions warn that sharp tools can damage the plastic washer on the bearing behind the seal. Clutch procedures cover housing alignment, dry-plate installation, slave-cylinder replacement, and hydraulic bleeding.

Rear-drive repair includes crown-wheel and bevel-pinion bearing replacement, backlash measurement, tooth-contact-pattern checks, and housing-cover shimming. Exploded shaft views and contact-pattern illustrations support component identification and adjustment.

Telelever, Brakes, and Electrical Layout

The front-fork chapter covers ball-joint and bearing work, fork-seal replacement, and assembly checks for movement without trapped stresses. Wheel procedures include balancing and runout checks; spoke replacement is limited to a single spoke.

Brake sections distinguish standard circuits from the additional ABS pressure-modulator bleeding procedures. ABS-unit work is reserved for an authorized BMW workshop. Observe the manual’s fuel-handling, brake-fluid, and electrical-isolation precautions.

Electrical references include relay positions in the central equipment box and left- and right-side wiring-harness views with enlarged detail pages. These show component locations and cable routing rather than electrical circuit schematics.

A Preview of Valve Clearances and Assembly Data

These examples represent a small selection of the manual’s service and assembly specifications. For both models, valve clearances with the engine cold, at no more than 35 °C (95 °F), are 0.15 mm intake and 0.30 mm exhaust.

Cylinder-head assembly data specifies crosswise tightening of the oiled nuts to 20 Nm plus two 90-degree angle stages. Gearbox oil capacity is 1.0 l; the oil-change procedure distinguishes the filler-hole level from the final top-up.

Searchable Text, Bookmarks, and PDF Contents

Text search and navigation: Body text is searchable, and 343 embedded PDF bookmarks provide chapter and procedure navigation. The examined relay-location and harness-detail illustrations are legible, with small routing details easier to inspect when enlarged.

Supplied as one printable, English-language 286-page PDF: 280 chapter pages, one cover, one introduction, two general contents pages, and two service forms. The maintenance schedule and pre-delivery checklist carry Order No. 01 71 0 008 872, dated 06.99; all these pages are already included in the total.