BMW R 42
| Production Year: | 1926, 1927, 1928 |  |
| Type: | air-cooled, four-stroke, boxer twin cylinder, SV |
| engine specs | |
| Type | air-cooled, four-stroke, boxer twin cylinder, SV |
| Displacement | 494 cm3 |
| Bore X Stroke | 2.7x2.7 in OR 69 mm |
| Compression Ratio | 4.9:1 |
| Horsepower | 12/3400 KW(hp)/RPM |
| Fuel System | 1x22mm BMW Spezial carburetor |
| transmission specs | |
| Gearbox | 3 speed, manual |
| Clutch | dry, single plate |
| Final Drive | shaft |
| chassis specs | |
| Frame | steel |
| Front Suspension | plate spring, 5 laminae |
| Rear Suspension | hard-tail, sprung seat |
| Front Brake | 150mm drum |
| Rear Brake | external shoe brake at gearing (on cardan shaft) |
| dimension specs | |
| Overall Length | 82.67 in OR 2100 mm |
| Overall Width | 31.49 in OR 800 mm |
| Weight | 277 lbs OR 126 kg |
| Fuel Capacity | 3.69 gallons OR 14.0 L |
| Wheelbase | 55.51 in OR 1410 mm |
| tyres specs | |
| Front | 27 x 3.5 |
| Rear | 27 x 3.5 |
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