BMW R80 Mono (1984-85)

The BMW R80 Mono is a motorcycle from 1984-85 with a four-stroke, 797.5cc engine that produces 36.4 kW/50 hp at 6500 rpm with a maximum torque of 58 Nm/5.9 kgf-m/42 ft/lb at 4000 rpm. The engine has a compression ratio of 9.2:1, and it is cooled by air with 2 valves per cylinder that are pushrod-operated. The bike has 2 Bing constant depression carburetors for air intake and a Bosch 12 V/280 W alternator. The clutch is a dry single plate with a diaphragm spring and the transmission has 5 speeds with a final drive of a shaft. The frame is a double loop tubular with bolt-on rear section, and the suspension consists of telescopic hydraulic forks in the front and a Monolever swinging arm in the rear. The front brakes have a single 285mm disc with 1 piston calipers, while the rear brakes have a 200mm drum. The front wheel is MTH 2.50 x 18 E and the rear wheel is MTH 2.50 x 18 E with front and rear tires of 90/90-17 and 120/90-18, respectively. The bike has a length of 2175mm, width of 800mm, and height of 1106mm with a wheelbase of 1447mm and a ground clearance of 140mm. The wet weight is 210kg and the fuel capacity is 22 liters. The bike has an average consumption of 5.9L/100 km or 17.0 km/l or 40 US mpg. The standing 1/4 mile is 14.5 sec with a top speed of 180 km/h or 112 mph.

---

Technical specifications:

Make Model: BMW R 80 Mono

Year: 1984-85

Engine: Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder.

Capacity: 797.5 cc / 48.7 cu in.

Bore x Stroke: 84.8 x 70.6 mm

Cooling System: Air cooled

Compression Ratio: 9.2:1

Induction: 2 x Bing constant depression carburetors

Ignition: Battery ignition

Alternator: Bosch 12 V/280 W

Spark Plug: Bosch W 7 D / Beru14-7DU / Champion N9YC

Starting: Electric

Max Power: 36.4 kW / 50 hp @ 6500 rpm

Max Torque: 58 Nm / 5.9 kgf-m / 42 ft/lb @ 4000 rpm

Clutch: Dry single plate, with diaphragm spring

Transmission: 5 Speed

Final Drive: Shaft

Gear Ratio: 1st 4.40 /2nd 2.86 /3rd 2.07 /4th 1.67 /5th 1.50:1

Rear Wheel Ratio: 1:3.20 or 1:3.36

Frame: Double loop tubular frame with bolt on rear section

Front Suspension: Telescopic hydraulic forks.

Front Wheel Travel: 175 mm / 6.8 in

Rear Suspension: Monolever swinging arm.

Rear Wheel Travel: 120 mm / 4.7 in

Front Brakes: Single 285mm disc, 1 piston calipers

Rear Brakes: 200mm Drum

Front Wheel: MTH 2.50 x 18 E

Rear Wheel: MTH 2.50 x 18 E

Front Tyre: 90/90-17

Rear Tyre: 120/90-18

Dimensions: Length 2175 mm / 85.6 in Width 800 mm / 31.2 in Height 1106 mm / 43.5 in

Wheelbase: 1447 mm / 56.9 in

Ground Clearance: 140 mm / 5.51 in

Wet Weight: 210 kg / 462 lbs

Fuel Capacity: 22 Litres / 5.8 US gal

Consumption Average: 5.9 L/100 km 17.0 km/l / 40 US mpg

Standing 1/4 Mile: 14.5 sec

Top Speed: 180 km/h / 112 mph