BMW R 51/2
| Manufacturer | BMW |
|---|---|
| Production | 1951 |
| Class | Classic |
| Engine | air-cooled, four-stroke, boxer twin cylinder, 2 valves per cylinder |
| Bore / Stroke | 68.6mm x 68.6mm |
| Compression ratio | 6.4:1 |
| Horse Power | 24.0 HP (17.9 KW) @ 5800RPM |
| Transmission | Gear box: 4-speed, manual Final Drive: shaft |
| Suspension | Front: telescopic fork Rear: coil compression springs and rubber deflection stops |
| Brakes | Front: 200mm drum Rear: 200mm drum |
| Front Tire | 3.5x19 |
| Rear Tire | 3.5x19 |
| Wheelbase | 55.0 inches (1397 mm) |
| Dimensions | L 83.86 inches (2130 mm) W 32.01 inches (813 mm) |
| Weight | (dry), 185.0 kg (wet) |
| Manuals | Service Manual |
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The BMW R 51/2 was a air-cooled, four-stroke, boxer twin cylinder, 2 valves per cylinder Classic motorcycle produced by BMW in 1951. Claimed horsepower was 24.0 HP (17.9 KW) @ 5800 RPM.
Engine
A 68.6mm bore x 68.6mm stroke result in a displacement of just 494.0 cubic centimeters.
Drive
The bike has a 4-speed, manual transmission. Power was moderated via the dry, single plate.
Chassis
It came with a 3.5x19 front tire and a 3.5x19 rear tire. Stopping was achieved via 200mm drum in the front and a 200mm drum in the rear. The front suspension was a telescopic fork while the rear was equipped with a coil compression springs and rubber deflection stops. The wheelbase was 55.0 inches (1397 mm) long.
1951 BMW R 51/2
The 1950 BMW R 51/2 is the first machine from the House of Munich to be equipped with a boxer engine, in the post-war era. It has, at its heart, an air-cooled, four-stroke, 494cc, twin cylinder powerhouse paired to a four-speed manual transmission, and can produce a claimed 24 horsepower at 5800 rpm.
Standard fittings include a telescopic front fork, a rear suspension composed of coil compression springs and rubber deflection stops a drum braking system, a single seat, a rear luggage rack, a dual exhaust, laced wheels and full fenders.