BMW R80 Mono

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BMW R 80 Mono
Production 1985
Class Standard
air-cooled, four-stroke, boxer twin cylinder, 2 valves per cylidner
Bore / Stroke 83.8mm x 83.8mm
Compression ratio 9.2:1
Top Speed 180 km/h / 112 mph
Horsepower 50.02 HP (37.3 KW) @ 6500RPM
Torque 42.78 ft/lbs (58.0 Nm) @ 4000RPM
Transmission Gear box: 5-speed, manual

Final Drive: shaft

Clutch: dry, single plate, diaphragm spring
Suspension Front: telescopic fork
Rear: Monolever
Brakes Front: single 285mm disc, 1-piston caliper
Rear: 200mm drum
Front Tire 90/90x17
Rear Tire 120/90x18
Wheelbase 57.01 inches (1448 mm)
Length 85.59 inches (2174 mm)
Width 31.5 inches (800 mm)
Weight 210.0 kg (wet)
Manuals Service Manual

The BMW R 80 Mono was a air-cooled, four-stroke, boxer twin cylinder, 2 valves per cylidner Naked motorcycle produced by BMW in 1985. Max torque was 42.78 ft/lbs (58.0 Nm) @ 4000 RPM. Claimed horsepower was 50.02 HP (37.3 KW) @ 6500 RPM.


A 83.8mm bore x 83.8mm stroke result in a displacement of just 797.0 cubic centimeters.


The bike has a 5-speed, manual transmission. Power was moderated via the dry, single plate, diaphragm spring.


It came with a 90/90x17 front tire and a 120/90x18 rear tire. Stopping was achieved via single 285mm disc, 1-piston caliper in the front and a 200mm drum in the rear. The front suspension was a telescopic fork while the rear was equipped with a Monolever. The wheelbase was 57.01 inches (1448 mm) long.

1985 BMW R 80 Mono[edit]

The 1985 MY BMW R 80 Mono has, at its heart, an air-cooled, four-stroke, 797cc, boxer twin cylinder powerplant paired to a five-speed manual transmission, and can reach a maximum power output of 50 horsepower and 58 Nm of torque.

In addition, it is one of the first machines from the House of Munich to be equipped with the Monolever rear suspension system, which improves comfort and overall performance significantly. Other features include a telescopic front fork, laced wheels, a single front disc brake coupled to a rear drum, a dual seat, pillion grab rails, die-cast aluminum wheels, an analogue instrument cluster and a steel, black frame.


BMW R80 Mono BMW R80 Mono


Make Model BMW R 80 Mono
Year 1984-85
Engine Type Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder.
Displacement 797.5 cc / 48.7 cu in.
Bore X Stroke 84.8 x 70.6 mm
Cooling System Air cooled
Compression 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 Tire 90/90-17
Rear Tire 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 Liters / 5.8 US gal
Consumption Average 5.9 L/100 km 17.0 km/l / 40 US mpg
Standing ¼ Mile 14.5 sec
Top Speed 180 km/h / 112 mph