Information kindly supplied by P.Hawksley

www.bmbikes.co.uk


Start of Production

1984

Click to View Available Literature

End of Production

1995

Numbers Produced

22,069

Price

12,690 DM

Engine

 

Motor Type

Four-stroke two cylinder horizontally opposed "Boxer" engine, air cooled

Bore x Stroke

84.8 x 70.6 mm (3.33 x 2.77 in)

Displacement

797.5 cc

Max Power

50 hp (37 KW) at 6,500 rpm. I'm informed that Swiss models were restricted to 33KW

Max Torque

58 Nm / 42 ft lb at 4,000 rpm

Compression Ratio

8.2 : 1

Valves Per Cylinder

2

Valve Control

OHV, using push rod and rocker arm

Carburation System

2 constant depression carburettors, Bing V 64/32/353 -  64/32/354

Engine Lubricating System

Wet sump



Power Transmission

 

Clutch

Dry single plate, with lever action diaphragm spring

Number of Gears

5

Gear Selection

Dog type gearbox (ratchet foot lever)

Gearbox Ratios

4.4 / 2.86 / 2.07 / 1.67 / 1.50

Rear Wheel Ratio

1 : 3.36

Bevel/Crownwheel

11 / 37 teeth


I'm informed by Didier that some Swiss models used 33/11 gearing



Electrical System

 

Ignition System

Contact free electronic ignition (Bosch)

Alternator

Bosch 280 W

Starter

Bosch 0.7 Kw

Spark Plugs

Bosch W 7 DC / Beru 14-7 DU/ Champion N9YC






Chassis

 

Type of Frame

Double loop tubular frame with bolt on rear section

Front wheel suspension

Telescopic fork with hydraulic shock absorber

Rear wheel suspension

BMW Monolever swinging arm

Spring Travel Front/Rear

175 / 121 mm (6.88 x 4.76 in)

Wheel Rims, Front

MTH 2.50 x 18 E

Wheel Rims, Rear

MTH 2.50 x 18 E

Tyres, Front

90/90 18 51 H

Tyres, Rear

120/90 18 65 H

Brakes, Front

Single or twin disc brake 285 mm  / 11.22 inch diameter. Brembo 2 piston caliper

Brakes, Rear

Simplex drum brake 200 mm / 7.87 in diameter




Dimensions/Weights

 

Length x Width x Height

2175 x 960 x 1478 mm (85.62 x 37.79 x 58.18 in)

Wheel Base

1447 mm / 56.96 in

Fuel Tank Capacity

22 litres / 4.83 gal / 5.81 gal US

Unladen Weight with Full Tank

227 Kg / 500 lb

Max. Permissible Weight

440 Kg / 969 lb

Ground Clearance

140 mm / 5.51 in

Seat Height (Unladen)

807 mm (31.8 inches)

Fuel Consumption

4.8 litres 100 Km (at constant 90 Kph) / 58 mpg / 48 mpg

Top Speed

170 Kph / 105 mph

Acceleration 0 - 100 Kph / 62 mph

6.4 seconds