Engine - PIAGGIO Vespa 150 1962 Operation And Maintenance Manual

Single horizontal cylinder, two-stroke, with deflector piston and rotary valve, i.e., the 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. Lubrication of piston, cylinder, wrist pin,
connecting rod, crankshaft, main bearings is attended to by the oil in the fuel mixture.
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.
Fig. 4 - Section of engine
1. Air cleaner and carburetor
6. Gear shifter 7. Flywheel magneto

ENGINE

2. Piston 3. Crank shaft
8. Kick-starter
4. Clutch 5. Main shaft with gear pinions
9. Crankcase arm, pivoted to the frame.
7