PIAGGIO Vespa 150 1962 Operation And Maintenance Manual page 25

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Setting the machine in motion. Let the engine idle, lift the clutch and turn the gear change
twist grip (L.H.) so that the line engraved on it coincides with the figure «1» (1st gear)
engraved on handlebars (see Fig. 16). Now let in the clutch gently, while opening the throttle
gradually to set the machine in motion.
Gear change. (See the drive system on Fig. 16.) After reaching some speed in 1st gear,
quickly close the throttle, lift the clutch and turn the gear change twist grip so that the
engraved line is opposite figure « 2 » (2nd gear). Now let in the clutch and open the throttle
gently. Repeat this procedure for changing into 3rd and 4th gear and for changing down.
When you reduce the speed of your machine, change down without delay.
Do not turn the gear change twist grip while the engine is not running.
As soon as gear change troubles arise, you should have your machine adjusted by a
Retailer or an Authorized Service Station.
Slow running adjustment. Idling revs can be raised or reduced respectively by simply
tightening or slackening, either with a screwdriver or by hand, the knurled slotted screw on air
cleaner steel sheet cover. The screw controls the throttle slide valve. (See Fig. 6.)
The adjuster screw for the throttle control cable is installed on the air cleaner case
(see Fig. 6). This screw is to be re-set only if necessary and on dismantling and re-
assembling. Opposite to said screw on the air cleaner case, is a plugged hole for
access to another screw (spring-loaded) with a tapering end. This screw controls the
flow of carburated air through-the duct from the idling jet, and consequently the idling
revs. We recommend that customers keep from resetting this screw, unless
indispensable or during dismantling and assembling operations.
Stopping the engine. Push the earthing button; this will leave the cylinder full of fuel vapors,
and the successive start will be easier.
25

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