Engine
|
| Type | four-stroke, two-cylinder, horizontally-opposed "Boxer" engine, air-cooled |
| Bore/stroke | 82 x 70.6 mm |
| Cubic capacity | 745 cm3 (45 in.3) |
| Max power | 50 HP / 36.8 kW at 6200 rpm |
| Max torque | 43 ft. lbs. / 60 Nm at 5000 rpm |
| Compression ratio | 9.0 : 1 |
| Valves per cylinder | 2 |
| Valve control | ohv, using push rod and rocker arm |
| Carburation system | 2 constant depression carburetors Type Bing 64/32/4-3 or 64/32/9-10 |
| Engine lubrication | wet sump |
| Power Transmission |
| Clutch | dry single plate, with diaphragm spring |
| Number of gears | 4 |
| shifting | dog-type gearbox (ratchet foot lever) |
| Gear ratios | 3.896 / 2.578 / 1.875 / 1.50 : 1 |
| Rear wheel ratio | 1 : 3.2 |
| Bevel/crown wheel | 10 / 32 teeth |
| Electrical System |
| Alternator | Bosch 12 V / 180 W |
| Ignition | battery ignition |
| Starter | Bosch 0.5 PS |
| Spark plugs | Bosch W 230 T 30 / Beru 230/14/3 A / Champion N 7 Y |
| Suspension
|
| Type of frame | double-loop tubular frame with bolt-on rear section |
| Front suspension | telescopic fork with hydraulic shock absorber |
| Rear suspension | long swinging arm with strut |
| Spring travel | 208 / 125 mm |
| Rims front | 1.85 B 19 |
| Rims rear | 1.85 B 18 or 2.15 B 18 |
| Tires front | 3.25 S 19 |
| Tires rear | 4.00 S 18 |
| Brakes front | Duplex-drum brake Ø 200 mm |
| Brakes rear | Simplex drum brake Ø 200 mm |
| Dimensions and Weights
|
| Length x width x height | 83 x 33 x 41 inches / 2100 x 850 x 1040 mm (1973 LWB: 85 x 33 x 41 inches or 2150 x 850 x 1040 mm) |
| Wheel base | 54.5 inches / 1385 mm (1973 LWB: 56.5 inches or 1435 mm) |
| Ground clearance | 6.5 inches / 165 mm ( at 165 lbs. or 75 kg load) |
| Tank capacity | 6.3 gals. / 24 liters (from 1971: 4.5 gals. or 17 liters) |
| Unladen weight, full tank | 463 lbs. / 210 kg (from 1971: 452 lbs. or 205 kg) |
| Max permissible weight | 877 lbs. / 398 kg |
| Performance
|
| Fuel consumption | 52.3 MPG (4.5 liters / 100 km) at constant 90 km/h or 56 mph |
| Acceleration | 0-100 km/h (0-62 mph) at 6.4 seconds |
| Top speed | 109 mph / 175 km/h |
BMW R 75/5
