BMW R850, R850R, R850GS, R1100GS, R1100R, R1100RS, R1100RT, R1100S, R1150GS Adventure, R1100R Rockster, R1150RS, R1100RT, R1200C Repair Manual 1993-2005

• BMW R850R 1996-1998 USA, 1995-2001 UK
• BMW R850C 2000-2001 UK
• BMW R850GS 2000-2001 UK
• BMW R1100GS 1995-1999 US, 1994-2000 UK
• BMW R1100R 1995-2001 US & UK
• BMW R1100RS 1993-2001 US, 1993-2002 UK
• BMW R1100RT 1996-2001 US, 1995-2001 UK
• BMW R1100S 1999-2005 US, 2000-2004 UK
• BMW R1150GS/Adventure 2000-2005 US, 1999-2004 UK
• BMW R1150R/Rockster 2002-2005 US, 2000-2004 UK
• BMW R1150RS 2002-2004 US, 2001-2003 UK
• BMW R1150RT 2002-2004 US, 2000-2004 UK
• BMW R1200C 1998-2004 US & UK

A cranking compression test is a quick way to check the internal condition of the engine (piston rings, pistons, head gasket, valves and cylinders).

It is a good idea to check compression at each tune-up, record it in the maintenance log at the end of this manual and compare it with subsequent readings.

Use the spark plug tool included in the motorcycle's tool kit and screw-in compression gauge with a flexible adapter.

Before using the gauge, check that the rubber gasket on the end of the adapter is not cracked or damaged; this gasket seals the cylinder to ensure accurate compression readings.

NOTE: Make sure the socket used to remove the spark plugs is equipped with a rubber insert that secures the spark plug.

This type of socket is included in the standard tool kit and is necessary for both removal and installation, since the spark plugs are located in the cylinder head receptacles.

It is not possible to remove or install the spark plugs by hand.

1. Make sure the battery is fully charged to ensure proper engine cranking speed.



2. Run the engine until it reaches normal operating temperature, then turn it off.

• General Information
• Quick Reference Data
• Troubleshooting
• Lubrication, Maintenance and Tune-Up
• Engine
• Servicing the Engine in Frame
• GS, R, RS and RT Engine
• R1100 Engine
• R850C and R1200C Engine
• Fuel and Exhaust Systems
• Cooling System
• Clutch
• Five-Speed Transmission and Gearshift Mechanisms
• Six-Speed Transmission and Gearshift Mechanisms
• Fuel, Emission Control and Exhaust Systems
• Electrical System
• Wheels, Hubs and Tires
• Front Suspension and Steering
• Rear Suspension and Final Drive
• Brakes
• Body and Frame
• Color-Coded Wiring Diagrams