VESPA 1962 150, Operation & Maintenance Manual

Page: 8 / 31

ENGINE
Single horizontal cylinder, two-stroke, with deflector piston and rotary valve, i. e.: fuel
mixture flow to the cylinder is controlled by the rotation of a crankweb (see Fig. 4).
The engine works on a 2% gasoline-oil mixture.
Bore 57 mm (2.24")
Stroke 57 mm (2.24")
Displacement 145.45 cc ( 8.88 cu.in )
Compression ratio 6.8 to 1 .
The engine is pivoted to the chassis of scooter through the cylindrical arm of the
crankcase half, clutch side, provided with a spindle and two bushes (see Fig. 4). Its
vibrations are damped by the rear suspension with variable rate coil spring and hydraulic
damper (see also page 13 ). The rear wheel is secured to the end of the mainshaft.
Ignition by an external H. T. coil with primary winding fed by another coil inside the
flywheel magneto (see Fig. 5).
Sparkplug: Marelli CW 230 A - T or CW 225 N - T, AC 43 F, Champion L. 86, Bosch W
225 T 1. - KLG F 70 or F 75.
Ignition timing with spark advance of 28° ± 10.
Lubrication of piston, cylinder, wrist pin, connecting rod, crankshaft, main bearings is
attended to by the oil in the fuel mixture.
Both clutch and gear box operate in oil bath.
Fuel supply by gravity with gasoline-oil mixture. The carburettor is embodied in the air
cleaner case, has a plate-shaped slide valve and immersed jets.
Fuel tank with total capacity of 7.7 liters (2.03 USA gals; 1.7 imp. gals) and emergency
reserve of about 1.4 I (0.37 USA gals; 0.3 imp. gals).
Three way tap («off» - «on» - «reserve»).
Transmission . The engine (see Fig. 4) directly drives the rear wheel through clutch, cush
drive and gear box.
Engine to wheel transmission ratios:
First : 13.35 to 1
Second : 9.32 to 1
Third : 6.64 to 1
Fourth : 4.73 to 1