Market Position:
The BMW R80 series represented BMW's enduring flat-twin boxer engine heritage in a more accessible package than the larger R100 models. This manual targets owners and enthusiasts who value the motorcycle's classic design, touring capability, and mechanical simplicity.
Competitors Class:
Competed with other European and Japanese motorcycles of similar displacement in the late 70s and 80s, but offered a distinct character and engineering.
Key Features Vehicle:
Robust air-cooled flat-twin engine, shaft drive, classic styling, comfortable ride, touring prowess.
Key Features Manual:
Enables comprehensive DIY maintenance and repair, ensuring longevity and optimal performance of the vintage BMW motorcycle.
Coverage:
Full Service, Repair, Maintenance, Rebuilding, Refurbishment, Restoration, Diagnostics
Page Count:
N/A (specific page count not provided in product description)
Manual Type:
Service and Repair Manual
Language:
English (implied by product description)
Format:
Likely digital (PDF) or printed book, depending on sale
Engine System:
Detailed overhaul, tuning, carburetor adjustment (Bing), ignition system, lubrication, cooling (air-cooled), exhaust system.
Transmission System:
Gearbox disassembly, assembly, lubrication, clutch operation and adjustment, final drive maintenance.
Chassis System:
Frame inspection and repair, front fork (suspension, steering head bearings), rear suspension (shock absorbers, swingarm bearings), wheel bearings, spokes, braking system (drum, disc if applicable), electrical system (wiring diagrams, lighting, charging system, battery).
Bodywork And Trim:
Body panel removal/installation, seat, fenders, fuel tank, controls, instrument cluster.
Routine Maintenance:
Oil changes, filter replacement, spark plug checks/replacement, chain adjustment, brake adjustments, tire pressure checks, battery maintenance, valve clearance adjustment.
Troubleshooting:
Diagnostic procedures for common starting issues, running problems, electrical faults, braking performance concerns.
Major Repairs:
Engine rebuilds, transmission overhauls, suspension component replacement, brake caliper rebuilding, electrical component diagnosis and repair.
Depth:
Comprehensive, covering full rebuilds and advanced diagnostics. Expect detailed torque specifications, clearances, and procedural steps for complex tasks.
File Format:
Potentially PDF for digital; Printed manual for physical product. Quality of PDF (searchable, image resolution) would be a key factor.
Print Quality:
N/A (for digital); High quality, durable paper and binding expected for printed manuals covering extensive procedures.
Binding Type:
N/A (for digital); Spiral-bound or saddle-stitched often preferred for workshop manuals for lay-flat usability.
Paper Type:
N/A (for digital); Durable, possibly coated paper to withstand workshop conditions for printed manuals.
Engine Type:
Air-cooled, four-stroke, horizontally opposed twin-cylinder (flat-twin boxer).
Displacement:
797.5 cc (approx. 800cc)
Bore X Stroke:
82.5 mm x 74.5 mm (typical for R80)
Compression Ratio:
8.2:1 (typical for R80)
Horsepower:
Approx. 50-55 hp at 6,500 rpm (depending on specific R80 variant)
Torque:
Approx. 57 Nm (42 lb-ft) at 5,000 rpm (depending on specific R80 variant)
Carburetors:
Dual 32mm Bing constant-velocity carburetors (e.g., Bing 32/32/303-304)
Fuel Type:
Unleaded gasoline, minimum 90 octane recommended.
Ignition Type:
Mechanical contact breaker points and coil ignition, or early electronic ignition systems (e.g., Bosch).
Length:
Approx. 2,180 mm (218 cm)
Width:
Approx. 830 mm (83 cm) at handlebars
Height:
Approx. 1,200 mm (120 cm) at seat
Dry Weight:
Approx. 195 kg (430 lbs)
Gross Weight:
Approx. 385 kg (850 lbs)
Fuel Tank Capacity:
20 Liters (5.3 US Gallons), including a 3-liter reserve.
Safety Ratings:
N/A (Motorcycles of this era did not have standardized crash test ratings like cars.)
Braking System:
Front: Single Disc Brake with dual-piston caliper; Rear: Drum Brake. Some later R80 models (like R80ST) might have had drum front, or variations. Manual would specify exact configuration.
Suspension:
Front: Telescopic forks with approx. 170mm travel. Rear: Monolever or twin shock swingarm with adjustable preload.
Lighting:
Halogen headlamp, tail lamp, brake lamp, turn signals.
Infotainment System:
N/A (This era of motorcycle focused on mechanical function, not electronic infotainment.)
Driver Assistance Systems:
N/A (No electronic driver assistance features)
Connectivity Features:
N/A (No electronic connectivity features)
Oil Change Interval:
Every 5,000 - 7,500 km (3,000 - 5,000 miles) or annually. Manual will detail specific interval for engine oil and final drive.
Valve Adjustment Interval:
Every 10,000 - 15,000 km (6,000 - 9,000 miles). Crucial for boxer engines.
Spark Plug Replacement:
Every 10,000 - 15,000 km (6,000 - 9,000 miles), or as needed based on condition.
Engine Oil Type:
API SG or higher, SAE 20W-50 or 10W-40 recommended for general use. Manual will specify precise BMW recommendation.
Transmission Oil Type:
SAE 80W/90 Hypoid Gear Oil (API GL-5).
Final Drive Oil Type:
SAE 80W/90 Hypoid Gear Oil (API GL-5).
Brake Fluid Type:
DOT 3 or DOT 4 for disc brake systems.
Common Issues:
Carburetor synchronization and jetting issues, starter motor wear, clutch pushrod seal leaks, ignition points wear, final drive spline wear, valve seat wear (less common with unleaded fuel but possible), swingarm bearing wear.
Bmw Motorrad Heritage:
BMW Motorrad has a long history dating back to the early 20th century, renowned for its engineering, reliability, and innovative boxer-twin engine designs which form the core of its identity.
R80 Series Evolution:
The R80 series, introduced in the late 1970s, served as a bridge between the larger capacity R-series bikes and smaller models. The R80/7 model was a popular iteration, offering a balance of performance and manageability. The 1985 model would likely fall within the /7 or the later Monolever (R80 RT, R80 G/S) generations, but the R80 designation generally implies the classic dual-shock setup unless specified otherwise.
Production Period:
The R80 series was produced from 1977 through the late 1980s, with various sub-models like R80/7, R80RT, R80G/S, R80ST.
