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BMW R50/5 Specifications

 

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Start of Production

1969

BMW R50/5

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End of Production

1973

Numbers Produced

7,865

Price

3,696 DM

Engine

 

Motor Type

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

Bore x Stroke

67 x 70.6 mm (2.63 x 2.77 in)

Displacement

498 cc

Max Power

32 hp (23.6 KW) at 6,400 rpm

Max Torque

39 Nm at 5,000 rpm

Compression Ratio

8.6 : 1

Valves Per Cylinder

2

Valve Control

OHV, using push rod and rocker arm

Carburation System

2 slide carburettors, Bing 1/26/113 - 1/26/114

Engine Lubricating System

Wet sump

Power Transmission

 

Clutch

Dry single plate, with diaphragm spring

Number of Gears

4

Gear Selection

Dog type gearbox (ratchet foot lever)

Gearbox Ratios

3.896 / 2.578 / 1.875 / 1.50 : 1

Rear Wheel Ratio

1: 3.56

Bevel/Crownwheel

9 / 32 teeth

Electrical System

 

Ignition System

Battery ignition

Alternator

Bosch 12 V/180 W

Starter

Bosch 0.5 hp (optional at additional charge)

Spark Plugs

Bosch W 230 T 30 / Beru 230/14/3 A / Champion N7Y

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

Long swinging arm with strut

Spring Travel Front/Rear

208 / 125 mm

Wheel Rims, Front

1.85 B 19

Wheel Rims, Rear

1.85 B 18 or 2.15 B 18

Tyres, Front

3.25 S 19

Tyres, Rear

4.00 S 18

Brakes, Front

Duplex drum brake 200 mm / 7.87 in diameter

Brakes, Rear

Simplex drum brake 200 mm / 7.87 in diameter

Dimensions/Weights

 

Length x Width x Height

2100 / (from 1973: 2150) x 850 x 1040 mm (82.67/84.64 x 33.46 x 40.94 in)

Wheel Base

1385 mm / 54.52 in (from 1973: 1435 mm / 56.49 in)

Fuel Tank Capacity

24 litres /5.27 gal / 6.34 gal US (from 1971: 17 litres / 3.73 gal / 4.49 gal US)

Unladen Weight with Full Tank

205 Kg / 451 lb (from 1971: 200 Kg / 440 lb)

Max. Permissible Weight

398 Kg / 876 lb

Ground Clearance

165 mm / 6.49 in

Seat Height (Unladen)

850 mm (33.5 inches)

Fuel Consumption

4.6 litres 100 Km (at constant 90 Kph) / 61 mpg / 51 mpg US

Top Speed

157 Kph / 97 mph

Acceleration 0 - 100 Kph / 62 mph

10.2 seconds

 

 

 

 

 

 

Member of BM Riders Club, The BMW Club, BMF, BMWMOA, The Airheads and The Poverty Riders

Check out my other sites at: www.bmridersclub.com & www.boxerman.co.uk