VESPA LX 4T USA Workshop Manual page 37

LX 4T USA
6) Start up the engine and, before adjusting the
idle speed, ensure the oil temperature is between
70 and 80 °C.
7) Wait for a few minutes to let the temperature
stabilise.
8) Without ever activating the throttle and
through the idle screw, bring the engine speed to
1,950 ± 50 rpm.
9) Adjust the flow screw so to obtain a "CO" read-
ing of 3.2 % ± 0.5 %.
10) Slowly twist the throttle handgrip, bringing the
engine up to a speed of 4,000 rpm and then re-
lease it; check the idle speed is the same as be-
fore, otherwise repeat the operations starting from
point (3).
Specific tooling
020332Y Digital rev counter
494929Y Exhaust fumes analyser
020331Y Digital multimeter
SAS filters inspection and cleaning
Use the two screws "A" on the right side panel and
remove it. Use the three screws "B" to remove the
cover of the secondary air box. Move the cover of
the box away and remove the sponge filter "C".
Wash the sponge with water and a neutral soap,
and dry it with a clean rag and shorts blasts of
compressed air. When cleaning the filter, make
sure the reed valve "D" is in good condition then
reinsert it in its seat on the box.
Before closing the SAS box cover, check the con-
dition of the O-ring seal; replace it if it appears
damaged or deformed.
N.B.
The reed valve can be inserted in only one direction on the
SAS housing
Maintenance
MAIN - 37