Yamaha SR 400 30th Anniversary Limited Edition (2008) vs BMW R 37 (1925-27)
Comparison technical specifications
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| Make: | Yamaha | BMW |
| Model: | SR 400 30th Anniversary Limited Edition | R 37 |
| Years: | 2008 | 1925-27 |
| Engine: | Four stroke, single cylinder, SOHC, 2 valves per cylinder. | Four stroke, two cylinder horizontally opposed Boxer, pushrod operated, OHV |
| Capacity: | 399 cc / 24.3 cu-in | 494 cc / 30.1 cu in. |
| Bore x Stroke: | 87 х 67.2 mm | 68 x 68 mm |
| Compression Ratio: | 8.5:1 | 6.2:1 |
| Cooling System: | Air cooled | Air cooled |
| Induction: | BSR33 carburetor | 1 x BMW Spezial three valve ∅26 mm |
| Ignition: | CDI | Bosch magneto ignition |
| Starting: | Kick | Kick |
| Max Power: | 27 hp / 17.1 KW @ 7000 rpm | 11.9 kW / 16 hp @ 4000 rpm |
| Clutch: | Wet, Multiple Disc | Single plate saucer spring, dry |
| Frame: | Steel Double Cradle | Twin loop tubular frame |
| Front Suspension: | Telescopic fork | Twin cantilever spring |
| Rear Suspension: | Dual shocks | Rigid, spring loaded saddle |
| Front Brakes: | Single disc | ∅150mm Drum |
| Rear Brakes: | Drum | Block brake |
| Front Tyre: | 3.50-19 | 26 x 3.00" |
| Rear Tyre: | 4.00-16 | 26 x 3.00" |
| Wet Weight: | 174 kg / 384 lbs | 134 kg / 295 lbs |
| Fuel Capacity: | 12 Litres / 3.2 gal | 14 liters / 3.6 USgal |