PIAGGIO Vespa 150 1962 Operation And Maintenance Manual page 28

Setting the head lamp. The correct orientation of the main beam can be obtained both
horizontally and vertically as follows (see Fig. 19):
- Check that both front and rear tires are inflated to 1.0 and 2.2 Kg/cm2 (14 and 31psi)
respectively;
- Place the scooter on a lever floor in front of a white wall as illustrated;
- Start the engine and hold the throttle control twist grip at about 1/3;
- Set the main switch on « main beam »;
- With two persons on the Vespa, slacken the two screws securing the head lamp, then
move the latter as required so that the beam axis coincides with point « 0 » on the wall; and
- Tighten the screws firmly.
This operation can be carried out also with the driver only sitting on the saddle. In this case,
of course, the beam alignment should be altered whenever the scooter is being ridden by
both driver and passenger.
Fig. 19 - Adjustment of headlamp
Dimension « 0 » to be set with driver and passenger on the machine.
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