Sas Filters Inspection And Cleaning - VESPA GT 125 Workshop Manual

Vespa GT 125-200

SAS filters inspection and cleaning

the SAS for leader engines 125 cm³ - 200 cm³ Euro
2 operates in a similar manner to the SAS for 2T
engines.
The differences are the following:
instead of entering through the muffler as for 2T
engine, the secondary air enters directly in the dis-
charge pipe on the head.
The 2T reed valve has a diaphragm. The unit, in-
dicated by an arrow in the figure, has a cut-off
connected to the depression intake on the inlet
manifold that cuts the air inlet in deceleration, to
avoid explosions in the muffler.
System description:
Air is drawn through the opening "A", goes through
the first filter and is channelled through the open-
ing "B"
Air gets to the second filter "B" through the opening
indicated in the figure.
Now, the filtered air enters the diaphragm device,
and then is channelled to the head.
Maintenance
MAIN - 55