Moto BM Motorcycles

Today in Motorcycle History

B.M. Bonvicini Bolonga 83 Sorano 1961

Engine: Single cylinder four-stroke OHV

Starter: Kick-starter

Bore & stroke: 49 x 52 mm

Compression ratio: 9.0:1

Engine Capacity: 83cc

Maximum power: 6.6 h.p. @ 7,000 rpm

Carburettor: Dell'Orto

Cooling system: Air cooled

Valves per cylinder: 2

Lubrication: Wet sump forced circulation with mechanical gear pump

Transmission: Gear primary, chain final

Clutch: Cable operated with multiple wet disc in oil bath

Gearbox: 4-Speed foot-change

Throttle: Cable operated

Frame type: Tubular and pressed-metal

Front Suspension: Telescopic

Rear Suspension: Mono shock

Front Brake: Drum

Rear Brake: Drum

Front Tyre: 2.75 x 19 in.

Rear Tyre: 2.75 x 19 in.

Seat: Dual seat

Fuel tank capacity: 13 litres (3.7 gal)

Top speed: 90 km/h (56 mph)

Weight: 75 kg (165 lbs)

Source: Hessink's NL

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