BMW R 51 (1938-40) technical specifications
BMW R 51 is produced in 1938-40. Engine is Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder., displacement 494 cc / 30.1 cu in. , produces power 18 kW / 24 hp @ 5800 rpm. BMW R 51 wet weight is 182 kg / 400 lbs. BMW R 51 has 2 photos.
Technical specifications
+ Add to 'Compare list'| Model: | R 51 |
| Years: | 1938-40 |
| Engine: | Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder. |
| Capacity: | 494 cc / 30.1 cu in. |
| Bore x Stroke: | 68 x 68 mm |
| Compression Ratio: | 6.7:1 |
| Cooling System: | Air cooled |
| Induction: | 2 x Amal 5/423 carburetors |
| Ignition: | Battery ignition |
| Starting: | Kick |
| Clutch: | Single plate, dry |
| Max Power: | 18 kW / 24 hp @ 5800 rpm |
| Transmission: | 4 Speed |
| Final Drive: | Shaft |
| Gear Ratio: | 1st 3.60 / 2nd 2.28 / 3rd 1.70 / 4th 1.30:1 |
| Frame: | Closed double loop steel tubular frame |
| Front Suspension: | Telescopic fork |
| Rear Suspension: | Long swing arm with suspension units and oil pressure shock absorbers |
| Front Brakes: | ∅200mm Drum, duplex full hub |
| Rear Brakes: | ∅200mm Drum, simplex full hub |
| Front Tyre: | 3.50 -19" |
| Rear Tyre: | 3.50 -19" |
| Wet-Weight: | 182 kg / 400 lbs |
| Fuel Capacity: | 14 liters / 3.60 US gal |
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