Original Market:
Mid-size touring and everyday rider motorcycle, known for robust engineering and reliability.
Competitors 1992:
Honda CB750, Kawasaki GPZ500S, Yamaha XJ600 Diversion.
Unique Selling Points:
Shaft drive, air-cooled boxer twin engine, BMW build quality, strong low-end torque.
Primary Coverage:
Mechanical Repair and Service
Secondary Coverage:
Maintenance, Troubleshooting, Electrical Systems, Chassis
Type:
Repair Service Manual
Format:
Print (likely comb-bound or stapled)
Engine:
Complete overhaul, cylinder head, piston, crankshaft, camshaft, valve train, oil pump, lubrication system.
Fuel System:
Carburetor(s) (Bing, likely 32mm), fuel pump, fuel lines, fuel tank servicing.
Transmission:
Gearbox assembly, clutch operation, shift mechanism, final drive (shaft drive).
Electrical System:
Ignition system (points or electronic), charging system (alternator/generator), starter motor, lighting, wiring diagrams, battery servicing.
Chassis And Suspension:
Front fork (telescopic), rear shock absorbers (twin shocks), swingarm, wheel bearings, steering head bearings.
Brakes:
Front and rear drum brakes or optional disc brakes, brake shoe/pad replacement, hydraulic system (if applicable), cable adjustments.
Bodywork And Fittings:
Body panels, seat, handlebars, controls, exhaust system.
Maintenance:
Oil changes, filter replacement, spark plug replacement, air filter cleaning, chain/shaft drive lubrication, brake adjustment, tire pressure checks.
Troubleshooting:
Diagnostic charts, common fault diagnosis for engine, electrical, and mechanical systems.
Repair:
Component disassembly, inspection, repair, and reassembly for all major systems.
Overhaul:
Engine and gearbox complete rebuild procedures.
Depth:
Comprehensive from basic rider maintenance to full engine rebuilds, including torque specifications and clearances.
Engine Type:
Four-stroke, air-cooled, boxer twin (flat-twin)
Displacement:
797.5 cc (approx. 800cc)
Bore X Stroke:
84.8 mm x 70.6 mm
Compression Ratio:
8.2:1 (typical)
Horsepower:
Approx. 50 PS (37 kW) at 6,000 rpm
Torque:
Approx. 60 Nm (44 lb-ft) at 4,000 rpm
Carburetors:
2 x Bing 32mm constant velocity carburetors
Fuel Type:
Unleaded gasoline, minimum 90 octane
Oil Type:
SAE 20W-50 motorcycle specific oil (e.g., Castrol GTX Classic SAE 20W-50 or equivalent)
Oil Capacity:
Approx. 2.5 liters (2.6 US quarts) with filter change
Gearbox Type:
5-speed constant mesh, foot-shifted
Clutch Type:
Single dry plate, diaphragm spring
Transmission Oil Type:
API GL-5, SAE 90 hypoid gear oil (check manual for specific grade)
Length:
Approx. 2,180 mm (85.8 in)
Width:
Approx. 800 mm (31.5 in) at handlebars
Height:
Approx. 1,280 mm (50.4 in) at seat
Dry Weight:
Approx. 194 kg (428 lbs)
Gross Vehicle Weight:
Approx. 375 kg (827 lbs)
Fuel Tank Capacity:
19 liters (5.0 US gallons)
Safety Features Standard:
Headlight, taillight, brake light, turn signals, mirrors, horn.
Braking System:
Dual circuit braking system (front and rear, potentially with integrated front/rear on disc models).
Frame Construction:
Steel tubular frame providing robust structural integrity.
Infotainment Features:
Basic analog instrumentation (speedometer, tachometer, fuel gauge, warning lights), no modern infotainment systems.
Safety Assist Features:
None (pre-ABS, pre-traction control era). Focus on rider skill and mechanical feedback.
Connectivity Features:
None.
Oil Change Interval:
Every 5,000 km (3,000 miles) or annually.
Valve Adjustment Interval:
Every 10,000 km (6,000 miles).
Spark Plug Replacement:
Every 10,000 km (6,000 miles).
Brake Fluid Type:
DOT 3 or DOT 4 (check manual for exact specification, especially if disc brakes are fitted).
Fork Oil Type:
SAE 10W (check manual for specific grade and quantity per fork leg).
Common Wear Items:
Clutch plates, brake pads/shoes, fork seals, swingarm bearings, steering head bearings, alternator brushes.
Potential Faults:
Carburetor synchronization issues, starter clutch wear, charging system output degradation, fuel line deterioration.
Brand History:
BMW Motorrad, established in 1923, renowned for its engineering prowess, durability, and focus on boxer twin engines.
R Series Heritage:
The R80 is part of BMW's long-standing 'R' series of boxer-engined motorcycles, evolving from models like the R75/5 and R60/7.
R80 Specifics:
Introduced in the late 1970s, the R80 series (including R80/7, R80G/S, R80ST) evolved into models like the R80RT and R80GS which continued into the 1990s with updates like the 1992 model which may feature minor refinements.
Production Period:
The R80 model range was produced from 1977 to 1995, with the 1992 variant falling within this significant production run.
