Secondary Air System - VESPA GTS 125 Owner's Manual

CAUTION
IF THE VEHICLE IS USED ON DUSTY ROADS, IT IS NECESSARY TO SERVICE
THE AIR FILTER MORE OFTEN TO AVOID DAMAGING THE ENGINE.
CAUTION
03_12
IN ORDER NOT TO DAMAGE THE VEHICLE PLASTIC COVERS CONTACT AN
AUTHORISED SERVICE CENTRE TO HAVE THE AIR FILTER CLEANED.
Recommended products
AGIP FILTER OIL
Oil for air filter sponge
Mineral oil with specific additives for increased adhesiveness
03_13

Secondary air system (03_14)

In order to reduce polluting emissions, the vehicle is furnished with a catalytic con-
verter in the muffler.
To facilitate the catalytic process, a further quantity of previously filtered air is brought
in through the exhaust duct on the head by the secondary air system (SAS).
This system allows more oxygen to be added to the unburned gases before reaching
the catalytic converter, thus improving the catalytic converter reaction.
The system has a control valve that disables operation during deceleration in order to
03_14 avoid abnormal noises.
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