In the early 1950s new regulations in Italy allowed access to motorways for motorcycles with a minimum capacity of 150cc, so Gilera upgraded its 125 to 150. The 150 presented in 1952 became Gilera's best-selling motorcycle ever, with 96,000 units produced (not including those built in Argentina).
The engine was revised by Antonio Parolo, Franco Passoni and Luigi Piazza under the supervision of the new director of the Gilera Experiment Service, Sandro Colombo, increasing the bore to 60 mm being the most notable change. The gearbox remained a 3-speed, with the Sport gaining a 4th gear in 1953. These models appeared in the catalogue until 1960.
Specifications
Engine: Single cylinder four-stroke OHV
Bore & stroke: 60 x 54 mm
Compression ratio: 6.1:1
Engine Capacity: 152.7cc
Maximum power: 7.5 h.p. @ 5800 rpm
Valves per cylinder: 2
Carburettor: Dell'Orto MA 18 B
Cooling system: Air cooled
Lubrication: Wet sump forced circulation with mechanical gear pump
Oil capacity: 1.35 litres
Transmission: Gear primary, chain final
Clutch: Cable operated with single wet disc in oil bath
Gearbox: 4 speed foot-change
Gearshift: Pedal Control, RHS
Starter: Kick-starter
Throttle: Cable operated
Frame type: Tubular and pressed steel
Front Suspension: Telescopic fork and shock absorbers
Rear Suspension: Swingarm with hydraulic shock absorbers
Front Brake: Drum
Rear Brake: Drum
Wheelbase: 1,300 mm
Seat: sprung solo saddle
Fuel tank capacity: 13 litres
Fuel consumption: 2.5 litres per 100 km
Weight: 100 kg
Source: Hessink's NL
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