Specifications |
|
| Engine | R 80 G/S |
| Type | Air-cooled flat twin, transversely mounted, with overhead valves in hemispherical combustion chambers |
| Max. power output (kW) | 37 |
| - at engine speed (min-1) | 6590 |
| Max. torque (Nm) | 56.7 |
| - at engine speed (min-1) | 5000 |
| Max. permissible engine speed (min-1) | 7400 |
| Max. continuous engine speed (min-1) | 7290 |
| Bore/stroke (mm) | 84.8 / 79.6 |
| Displacement, effective (cm3) | 797.5 |
| - for taxation purposes (cm3) | 785 |
| Compression ratio | 8.2 to 1 |
| Direction of rotation | Clockwise, looking at alternator |
| Fuel consumption by DIN standard test method (liters/100 km) | 5.0 |
| (lmp. US mile/gal) | 56.5/47.0 |
| Carburetors | R80 G/S |
| Type | Two inclined Bing constant-depression carburetors with needle jet, vacuum slide throttle butterfly and central lever float. |
| Ref. No., left | V 64/32/305 |
| Right | V 64/32/306 |
| Throat diameter (mm) | 32 |
| Main jet | 145 |
| Needle jet | 2.64 |
| Jet needle No. | 46-241 |
| Needle position | 4 |
| Idle jet | 45 |
| Idle air jet diameter | 1 |
 |
|
| Transmission | R 80 G/S |
| Clutch | Single dry plate with increased leverage diaphragm spring |
| Gearbox | 5-speed, with dog-clutch engagement, forming a single unit with the engine block; drive torque damping in all gears, hook-action gear selection |
| Gear ratios | 1st 4.4 to 1 |
| 2nd 2.86 to 1 | |
| 3rd 2.07 to 1 | |
| 4th 1.67 to1 | |
| 5th 1.50 to 1 | |
| Rear wheel drive | Enclosed universal-joint shaft in swinging arm tube, with universal joint at gearbox end and curved-spline coupling at final drive end; with torsional vibration damper |
| Final drive | Crownwheel and spiral bevel pinion, Palloid tooth pattern |
| Final drive ratio | 3.36 to 1 |
| Number of teeth | 11/37 |
| Speedometer drive ratio (km) | 0.773 |
| (miles) | 1.244 |
| Frame | R80 G/S |
| Frame pattern | Twin loop steel-tube frame with bolted-on rear subframe; sidecar attachment not permitted |
| Location of manufacturer's plate and frame number | On right gusset plate between steering head and frame |
| Front suspension | Telescopic forks with large volume double-acting hydraulic dampers; travel 290 mm (7.9 in) |
| Rear suspension | Lightweight swinging arm with three position spring strut ('Monoshock') with double acting hydraulic damper; travel 179 mm (6.7 in) |
| Max steering lock at forks | 47o |
| Front wheel castor | 114mm (4.49in) |
| Front brake | Hydraulic single disc with fixed caliper |
| Disc diameter (mm) | 260 (10.2 in.) |
| Effective lining area (cm2) | 37 (5.74 in.2) |
| Rear brake | Light alloy drum in full-width hub; leading and trailing shoes |
| Drum diameter (mm) | 200 (7.9 in.) |
| Effective lining area (cm2) | 89 (13.8 in2 ) |
| Frame | R80 G/S |
| Wheels | Spoked, with hardened aluminum rims of WM profile |
| Rim sizes - front | 1.85 B x 21 |
| -rear | 2.15 B x 18 |
| Tires | Special pattern, with inner tube (see also page 33, 'Important note') |
| Sizes - front | 3.00 - 21 48 R |
| -rear | 4.00 - 18 64 R |
| Tire pressures in bar (Ib/in2) with tires cold | |
| Solo | |
| Front | Rear |
| 1.9(27) | 1.8(26) |
| Two up | |
| Front | Rear |
| 2.1(30) | 2.2(31) |
| Note: comply with minimum legal tread depth requirements, | |
| BMW minimum tread depth recommendations: | |
| up to 130km/h (81 mile/h) | 2 mm (0.08 in) |
| above 130km/h (81 mile/h) | 3 mm (0.12 in) |
| Fuels and lubricants | R 80 G/S |
| Fuel | Regular grade petrol (gasoline) to German Industrial Standard DIN 51609 or equivalent, minimum octane number 91 (RM) or 82 (MM) |
| Tank capacity | 19,5 liters (4.3 lmp./5.2 US gal) |
| including reserve of | app. 2 liters (0.44 lmp./0.53 US gal) |
| Engine oil | Brand-name HD oil for spark-ignition engines, API Class SE |
| Viscosity/outside temperatures |
| Fuel and lubricants | R 80 G/S |
| Engine oil content if filter element is not changed | 2 liters (3.5 Imp. Pints, 2.1 US quarts) |
| if filter element is changed | 2.25 liters (4.0 Imp. Pints, 2.4 US quarts) |
| Gearbox oil content | 0.8 liter (1.4 Imp. Pints, 0.85 US quart) |
| Rear swinging arm oil content | 0.15 liter (0.26 Imp. Pint, 0,16 US quart) |
| Final drive oil content | 0.35 liter (0.62 Imp. Pint, 0.37 US quart) |
| Brand-name hypoid gear oil | |
| above 50C (410F) | SAE 90 |
| below 50C (410F) | SAE 80 |
| Telescopic forks - oil grades | Shell 4001, Shell Aero Fluid 4, Castro DB Hydraulic Fluid, Castrol 1-318 Shock Absorber Oil, Aral P3441 Shock Absorber Oil, Mobil Aero HFA, Mobil DTE 1, Esso Universal J13 |
| Content per fork leg | 0.22+0.01 liter (0.39 +0.02 Imp. pint, 0.23 + 0.01 US quart) |
| Wheel bearings and all other greasing points | Brand-name multipurpose grease, drip point 1800C (3500F) |
| Battery terminals | Acid-free grease, 'Vaseline' |
| Brake fluid | |
| Grade | DOT 4; ATE 'SL' brake fluid |
| Quantity required to fill and bleed empty system | app 0 3 liter (106 fl. oz) |
| Electrical system | |
| Battery | Varta 12 V, 9 Amp/h (optional extra 12 V, 16 Amp/h battery in conjunction with electric starter) |
| Starter (optional extra) | Bosch 0.7 kW |
| Alternator | Bosch 280 W |
| Voltage regulator | Wehrle E 1051 B/14 V |
| Coil | Bosch 12 V twin-spark |
| Ignition trigger | Contactless ignition pulse generator (Hall effect) with integral centrifugal advance4 Mfr Bosch |
| Advance movement begins at 1500 rnin-1 Advance movement ends at 3500 rnin-1 |
|
| Ignition timing | 6o before TDC at 800 - 1100 rnin-1 |
| Maximum advance | 32 o before TDC at min. 3000 rnin-1 |
| Spark plugs | Bosch W7D Beru 14-70 Champion N 10 Y |
| Electrode gap | 0.6 + 0.1 mm (0.024 + 0.004 in) |
| Flasher unit | Bosch 0 335 200 043 |
| High and low (dipped) headlight beams | H 4 halogen bulb, 60/55 Watt dual filament |
| Parking light | 12 V, 4 Watt |
| Telltale and warning lamps: | |
| High beam (blue) | 12V, 3Watt |
| Neutral (green) | 12V, 3Watt |
| Turn indicator (green) | 12V, 3Watt |
| Charge(red) | 12V, 3Watt |
| Oil pressure(red) | 12V, 3Watt |
| Speedometer Lighting | 12V, 3Watt |
| Fuses (2) | 8 Arnp |
| Flashing turn indicators, (2 front, 2 rear) | 12V, 21 Watt |
| Rear/brake light | 12V, 21/5 Watt |
| Dimensions | R80 G/S |
| Overall width (engine) (mm) | 746 (29.4 in.) |
| Overall width (handlebars, excl. mirrors) (mm) | 820 (32.3 in.) |
| Overall height excl. mirrors (unladen) (mm) | 1150 (45.3 in.) |
| Dualseat height (unladen) (mm) | 860 (33.9 in.) |
| Overall length (mm) | 2230 (87.8 in.) |
| Wheelbase (mm) | 1465 (57.7 in.) |
| Ground clearance (with rider weighing 75kg ,165 lb.)) (mm) | 175 (6.9 in.) |
| Ground clearance at unladen weight (mm) | 218 (8.6 in.) |
| Weights | |
| Dry weight (DIN standard unladen weight) (kg) | 167 (368 lb.) |
| Weight with tank full, ready for road, incl. Tools (kg) | 186 (410 lb.) |
| Gross weight limit unladen weight + rider and pillion and/or luggage (kg) | 398 (877 lb.) |
| Power/weight ratio, ready for road, incl. rider (75 kg (165 lb.) (kg/bhp) | 7.05(15.5 lb/bhp) |
| Permissible wheel loads | |
| - front, tire pressure 2.1 bars (30 lb/in2) (kg) | 178 (392 lb.) |
| - rear tire pressure 2.2 bars (31 lb/in2 ) (kg) | 270 (595 lb.) |
| Max number of persons to be carried | 2 (1 rider, 1 pillion passenger) |
| Performance | R80G/S |
| Acceleration from 0 to 100km/h (0 - 62 mile/h) | 5.6 s |
| - from 0-140km/h (0 - 87 mile/h) | 10.6 s |
| -from 0 to 400m(1312ft) | 13.8 s |
| - from 0 to 1000m (3251 ft) | 26.5 s |
| Speeds in gears, with upward shifts at 7000 /min | |
| 1st (km/h) | 57(35 mile/h) |
| 2nd (km/h) | 88 (55 mile/h) |
| 3rd (km/h) | 122 (76 mile/h) |
| 4th (km/h) | 152 (94 mile/h) |
| Top speed, rider seated (km/h) | app. 165 (103 mile/h) |
| rider crouched (km/h) | app. 168 (104 mile/h) |
| The maximum speed the motorcycle can actually achieve depends to a great extent on aerodynamic drag caused by the size of the rider, his position and his clothing, the road surface and weather conditions | |
