Target Audience:
Owners and mechanics of BMW R80GS, R100GS, and R100R motorcycles, particularly those who perform their own maintenance and repairs.
Value Proposition:
Provides essential, specific information for the maintenance and repair of these classic BMW Boxer motorcycles, empowering owners to save costs and prolong vehicle life.
Ease Of Repair Emphasis:
Highlights the inherent reliability and simplicity of the BMW Boxer design, making home maintenance and repair accessible and straightforward.
Engine Systems:
Detailed coverage of the Boxer twin-cylinder engines, including maintenance, troubleshooting, and overhaul procedures for R80GS, R100GS, and R100R.
Transmission Clutch Systems:
Complete information on the gearbox, clutch operation, maintenance, and repair, including clutch friction plate replacement and gearbox component inspection.
Brake System:
Comprehensive guide to the hydraulic brake systems, including caliper service, brake fluid replacement, and troubleshooting.
Suspension Steering:
Detailed instructions for inspecting and maintaining the front forks (including WP or Marzocchi depending on specific model/year), rear monoshock (Paralever system on GS models), steering head bearings, and related components.
Electrical System:
Coverage of ignition system, lighting, battery, charging system, starter motor, and basic troubleshooting of electrical faults, including wiring diagrams.
Fuel System:
Maintenance and servicing of the fuel system, including carburetor adjustment (likely Bing carburetors), fuel filters, and fuel pump systems.
Exhaust System:
Information on exhaust system components, maintenance, and replacement.
Frame Attachments:
Guidance on frame maintenance, inspection of attachment points, and related components such as seats and bodywork.
Routine Maintenance:
Detailed procedures for oil changes, spark plug replacement, filter changes (oil, fuel, air), drive shaft lubrication (if applicable), and general inspection checklists.
Scheduled Maintenance:
Guidance on recommended service intervals for various components and systems, ensuring optimal performance and longevity.
Troubleshooting:
Diagnostic procedures and solutions for common issues encountered with these models, covering engine performance, electrical faults, and mechanical problems.
Repair Overhaul:
Step-by-step instructions for major repairs and component overhauls, including engine rebuilds, gearbox repairs, and suspension component replacement.
Depth:
Comprehensive, suitable for home mechanics through to professional technicians. Covers from basic checks to in-depth engine and transmission rebuilds.
Engine Type:
Air-cooled, four-stroke, Boxer twin-cylinder engine
Displacement R80Gs:
797.5 cc (48.7 cu in)
Displacement R100Gs R100R:
979.7 cc (59.8 cu in)
Bore X Stroke R80Gs:
84.8 mm x 70.6 mm (3.34 in x 2.78 in)
Bore X Stroke R100Gs R100R:
94 mm x 70.6 mm (3.70 in x 2.78 in)
Horsepower R80Gs:
Approx. 50 hp (37 kW) at 6,500 rpm
Horsepower R100Gs R100R:
Approx. 60-65 hp (45-48 kW) at 6,500-7,000 rpm
Torque R80Gs:
Approx. 54 Nm (40 lb-ft) at 5,000 rpm
Torque R100Gs R100R:
Approx. 70-75 Nm (52-55 lb-ft) at 5,000-6,000 rpm
Carburetors:
Typically dual Bing 32mm or 40mm constant-velocity carburetors (specifics vary by model and year).
Fuel Type:
Unleaded gasoline
Oil Capacity With Filter:
Approx. 2.5 - 3.0 liters (depends on model and filter change)
Infotainment Features:
N/A (These models predate modern infotainment systems. Focus is on mechanical and electrical function.)
Driver Assistance Features:
N/A (Focus is on core motorcycle mechanics, not electronic rider aids.)
Connectivity Features:
N/A (Analog instrumentation and mechanical controls are standard.)
Oil Change Interval:
Typically every 5,000-10,000 km (3,000-6,000 miles) or annually, depending on usage. Check manual for specific recommendations.
Valve Adjustment Interval:
Every 10,000 km (6,000 miles) or as per manual recommendations.
Engine Oil Grade:
Typically SAE 20W-50 or 10W-40 (API SG or higher) for air-cooled engines. Specific grade may vary with climate and model year. Consult manual.
Gearbox Oil Grade:
Hypoid gear oil, SAE 90 or 80W-90.
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid.
Clutch Lever Pivot Wear:
Wear at the clutch lever pivot point can lead to a sloppy feel. Lubrication or replacement of the pivot pin is recommended.
Paralever Spline Lubrication:
Proper lubrication of the Paralever drive shaft splines is crucial to prevent wear and ensure smooth operation. Neglect can lead to spline damage.
Carburetor Synchronization:
Regular synchronization of the dual carburetors is essential for smooth engine performance and idle.
Electrical Connector Corrosion:
Older electrical connectors can be prone to corrosion, leading to intermittent electrical issues. Cleaning and dielectric grease are often beneficial.
Bmw Motorrad Legacy:
BMW Motorrad's long-standing reputation for robust engineering, durability, and innovative design in motorcycle manufacturing.
Gs Series Development:
The R80GS and R100GS are iconic models in the 'Gelande/Strasse' (off-road/street) lineage, blending touring comfort with off-road capability, featuring the revolutionary Paralever rear suspension system starting in 1987.
R100R Positioning:
The R100R, introduced later, offered a more road-biased interpretation of the Boxer twin, often with more refined styling and alloy wheels.
Production Period Gs Models:
R80GS: 1987-1990; R100GS: 1987-1996
Production Period R100R:
1991-1996
