BMW R 25/3 |
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Dates: 1953 — 1956 Number sold 47,700
German Price: DM 2,060.- |
Engine | |
| Internal Designation | 224/4 |
| Motor Type | four-stroke single-cylinder vertical |
| Stroke | 68 x 68 mm |
| Displacement | 247 ccm |
| Max Power | 13 hp at 5800 rpm |
| Compression Ratio | 7.0:1 |
| Valves | ohv |
| Carburetion System | 1 x Bing type 1/24/41 or SAWE type K 24 F |
| Engine Lubricating System | forced-feed lubrication |
| Oil Pump | gear pump |
| Power Transmission |
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| Clutch | single-plate, dry |
| Number of Gears | 4 |
| Shifting | foot switching (+ auxiliary manual switch on gearing block) |
| Gearbox Ratios | 6.1/3.0/2.04/1.54 |
| Rear Wheel Ratio | 4.16:1 (with sidecar 4.8:1) |
| Bevel/Crownwheel | 6/25 teeth (with sidecar 5:24) |
| Electrical System |
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| Ignition System | battery ignition |
| Generator | Noris ZLZ 60/6/1600 L |
| Spark Plugs | Bosch W 240 T1 |
| Chassis |
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| Designation | 225/3 |
| Frame | closed steel twin-loop frame, welded |
| Front Wheel Suspension | telescopic fork |
| Rear Wheel Suspension | telescopic suspension |
| Wheel Rims | 3 x 18 deep-bed |
| Tyres front | 3.25 x 18 |
| Tyres rear | 3.25 x 18 |
| Brakes front | drum brake ø 160 mm, full width |
| Brakes rear | drum brake ø 160 mm, full width |
| Dimensions and Weights | |
| Length x Width x Height | 2065 x 760 x 730 mm (Saddle) |
| Wheel Base | 53.7 inches (1365 mm) |
| Fuel Tank Capacity | 3.17 gallons (12 liters) |
| Unladen Weight, Full Tank | 330 pounds (150 kg) |
| PermittedWeight Limit | 705 lbs. (320 kg — with original sidecar 450 kg ) |
| Clearance | 3.6 inches (92 mm) |
Performance |
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| Idle/Riding Noise | 82/84 phon |
| Fuel Consumption | 81 MPG (2.9 liters/100 km) |
| Oil Consumption | 2.4 pints/1000 mi. (0.7 liters/1000 km) |
| Top Speed | 74 MPH (119 kph — with original sidecar 88 kph) |
