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GENERAL SPECIFICATION

Engine (see fig. 5) : Single horizontal cylinder two stroke rotary distribution: i. e.,

carburated mixture is regulated by the crankshaft rotation. Performance and

specifications concerning Vespa 150 cc. and 125 cc. at pages 42 - 43. The engine is

pivoted to the vehicle's chassis through the crankcase swinging arm, clutch side (fig.

20). The rear wheel is fitted on the outer side of the drive shaft.

Lubrication of engine components (piston, cylinder, crankshaft, main bearing) is

effected by the oil in the fuel mixture. The clutch and gear box function in oil bath.

Fuel supply (see fig. 9): gravity feed with mixture of oil and petrol. 3 way tap :

<closed>, <open>, <reserve>. Carburettor located in the air filter housing, provided

with a throttle slide.

Ignition by means of a H. T. flywheel magneto external coil.

Clutch (see fig. 5) : multiplate on the layshaft. The unit is operated by a lever

located on L. H. handlebars and adjustable cable.

Gear box (see fig. 7): four speed drive with mesh gears. Operated by the twist grip on L.

H. handlebar which functions in conjunction with the clutch control lever.

Transmission ratio engine to driving wheels see at pages 38-39.

Starting (see fig. 6) : by means of a kickstarter on the R. H. side of the vehicle.

Cooling: by means of a centrifugal fan. Air intake: located inside the frame.

Muffler: expansion and absorption type.

Integral chassis (fig. 1) : pressed sheet steel, streamlined monocoque type structure.

Handlebars: Light alloy casting comprising speedometer. All transmission cables and

various controls are concealed therein.

Steering column, suspension : On the lower end of the steering column is pivoted

the front wheel swinging hub. Front and rear suspensions with helical spring and

double acting hydraulic damper.

Wheels: Interchangeable and made up of pressed steel flanges; 3,50 - 8" tires.

Saddle: single saddle or dual saddle (optionally instead of single and luggage rack).

Brakes: cable operated expanding type. Front brake is operated by hand - lever (R. H.

handlebars) ; the rear brake is pedal operated on R. H. footboard.

Parking stand: a two legged stand with a central return spring.

Steering lock: with a sliding bar acting on the steering column.

PIAGGIO Vespa 125 Super User Manual

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