Market Position:
The BMW R80 GS and R100 R series represented the pinnacle of adventure touring and rugged road motorcycles for their era, known for durability, reliability, and off-road capability (GS models).
Competitors 1993:
Yamaha Tenere, Honda Africa Twin, Kawasaki KLR650, Suzuki DR series; also competing with larger displacement road bikes for touring.
Motorcycle Key Features:
Air-cooled boxer twin engines, shaft drive, robust chassis, adjustable suspension (especially on GS models), characterful riding experience.
Manual Value Proposition:
Essential for owners seeking to maintain, diagnose, and repair their vintage BMW boxer twins, ensuring longevity and optimal performance.
Systems Covered:
Engine, Transmission, Drivetrain, Chassis, Electrical System, Fuel System, Suspension, Brakes, Bodywork, Cooling System, Lubrication System, Exhaust System, Troubleshooting
Estimated Page Count:
Approximately 300-500 pages (typical for comprehensive workshop manuals of this era, exact count not specified in product info)
Manual Type:
Service Repair Workshop Manual
Language:
English (presumed, standard for international manuals)
Engine Overhaul:
Complete disassembly, inspection, repair, and reassembly of the boxer twin engine.
Transmission And Drivetrain:
Gearbox, clutch, driveshaft, final drive inspection and service.
Electrical System:
Wiring diagrams, ignition system, charging system, lighting, starter motor, troubleshooting.
Fuel And Carburetion:
Fuel tank, lines, fuel pump, and carburetor (often Bing or equivalent) maintenance and adjustment.
Suspension And Steering:
Front forks (Monolever or Paralever depending on specific GS/R variant), rear shock absorber, steering head bearings, wheel bearings.
Braking System:
Brake levers, master cylinders, calipers, brake lines, and disc servicing.
Bodywork And Frame:
Fairing, seat, fuel tank, fenders, frame inspection and repair.
Routine Maintenance:
Oil changes, filter replacements, spark plug checks, chain adjustment, tire pressure checks, brake pad inspection.
Troubleshooting Guides:
Diagnostic steps for common performance issues, starting problems, electrical faults.
Component Rebuilding:
Detailed instructions for rebuilding carburetors, brake calipers, suspension components, and engine internals.
Torque Specifications:
Precise torque values for critical fasteners throughout the motorcycle.
Chassis And Frame Inspections:
Inspection for cracks, alignment, and integrity of the frame and swingarm.
Electrical Troubleshooting Diagrams:
Detailed wiring diagrams with color coding for simplified diagnosis of electrical faults.
Carburetor Tuning And Rebuilding:
Comprehensive guides on jetting, synchronization, and complete carburetor rebuilds.
Diagnostics:
In-depth diagnostic procedures for identifying and resolving mechanical and electrical issues.
Repair Procedures:
Step-by-step repair instructions with clear illustrations and diagrams for most components.
Overhaul Instructions:
Detailed procedures for complete engine, transmission, and suspension overhauls.
Diagnostic Charts:
Fault finding charts based on symptoms to quickly identify root causes.
Special Tool Requirements:
Identification of BMW-specific tools or common aftermarket tools required for repairs.
Engine Type:
Air-cooled, four-stroke, horizontally opposed twin-cylinder (boxer)
Bore X Stroke R80:
81 mm x 75.6 mm (typical for R80 variants)
Bore X Stroke R100:
94 mm x 70.6 mm (typical for R100 variants)
Displacement R80:
797.5 cc
Displacement R100:
979.9 cc
Horsepower R80 Approx:
50-60 HP (depending on specific tuning and market)
Horsepower R100 Approx:
60-70 HP (depending on specific tuning and market)
Torque R80 Approx:
60-65 Nm (approx)
Torque R100 Approx:
70-75 Nm (approx)
Carburetion Type:
Dual constant velocity carburetors (e.g., Bing 32/40mm depending on model variant)
Fuel Type:
Unleaded gasoline (minimum 91 octane recommended)
Valve Actuation:
Overhead valves (OHV), pushrod actuated
Cooling System:
Air cooling
Ignition System:
Electronic ignition (CDI) with dual spark plugs per cylinder
Transmission Type:
5-speed manual gearbox
Clutch Type:
Dry single-plate clutch, hydraulically operated
Drive System:
Shaft drive to rear wheel
Gear Ratios:
Specific gear ratios are detailed within the manual, critical for performance tuning and repair.
Transmission Oil Specification:
SAE 75W/90 or SAE 80W/90 GL-5 gear oil (refer to manual for specific BMW recommendation)
Wheelbase Gs Approx:
Approx. 1430 mm (R80GS/R100GS Monolever)
Wheelbase R Approx:
Approx. 1400 mm (R100R Paralever)
Dry Weight Approx:
R80GS: ~215 kg; R100R: ~195 kg (GS models tend to be heavier due to off-road components)
Fuel Tank Capacity Approx:
20-24 Liters (including reserve)
Front Wheel Size Gs:
19-inch (typical for GS models)
Front Wheel Size R:
18-inch (typical for R models)
Rear Wheel Size:
17-inch (typical for both)
Front Tire Spec Gs:
90/90-19 (typical, manual will confirm specific fitment)
Rear Tire Spec Gs:
130/80-17 (typical, manual will confirm specific fitment)
Infotainment System:
N/A (No integrated infotainment systems on 1993 models; aftermarket options may exist).
Driver Assistance Features:
N/A (Primarily mechanical systems; ABS was not standard for this year).
Connectivity Features:
N/A.
Instrument Cluster:
Analog speedometer, tachometer, fuel gauge, indicator lights.
Oil Change Interval:
Every 6,000-10,000 km or annually (refer to manual for precise intervals and conditions).
Valve Adjustment Interval:
Every 10,000-12,000 km.
Spark Plug Replacement:
Every 10,000-15,000 km.
Engine Oil Specification:
SAE 20W-50 or SAE 15W-50 API SG (or higher) motorcycle-specific oil.
Engine Oil Capacity Approx:
Approx. 2.5 Liters (with filter change).
Brake Fluid Specification:
DOT 4 brake fluid.
Final Drive Oil Specification:
SAE 80W/90 GL-5 gear oil.
Common Issues Potential:
Wear in the final drive splines, embrittlement of rubber components (hoses, seals), electrical connections corrosion, carburetor synchronization drift, worn steering head bearings.
Gs Specific Issues:
Monolever pivot bearing wear, shock absorber seal leaks on older GS models.
Bmw Motorcycle Heritage:
BMW has a long history of producing robust, reliable motorcycles, particularly known for their boxer engines and shaft drive since the 1920s.
R Series Evolution:
The R80 and R100 series evolved from earlier 'R' models, with the 'GS' designation signifying 'Gelände/Straße' (off-road/street), a concept pioneered by BMW with the R80G/S in 1980. The R100R represented a more road-focused variant. The Monolever and later Paralever rear suspension systems were key developments.
Production Era:
The R80 GS and R100 R/GS models were produced through the 1980s and into the 1990s. The 1993 model year represents the later iteration of this successful platform.
