BMW Sport and Racing Motorcycles
BMW-Rennsport.com
OL Special Specs
Engine DOHC twin (Königswelle)
Capacity 494 cc
Bore x Stroke 70 x 64 mm
Compression Ratio 11.4:1
Carburation 2 x 36 mm Dell'Orto
Ignition Electronic - Krober
Output Approx. 70bhp @10,000 RPM
Gearbox 5 Speed
Frame Tubular steel
Suspension
Front Telescopic (Ceriani 35mm)
Rear Swingarm (Koni)
Brake
Front 210mm 4LS drum (Fontana Magnesium)
Rear 310mm Disc
Tires 3.50 x 19 (front and rear)
Weight 298 lbs wet
Top Speed ~140 mph
The card above was published in 1993 as part of a large collector series of motorcycles. The specifications listed are for the factory long stroke bikes. The OL Special put out 70 hp at 10,000. This was a substantial improvment over the factory long stroke motor. It was made possible through the use of a short stroke crank, higher compression pistons and dual plug ignition, amongst other things.