03_11
03_12
03_13
Secondary air system (03_11, 03_12, 03_13)
In order to reduce polluting emissions, the vehicle is equipped with a catalytic con-
verter.
The catalysis is aided by the admission of fresh air, depurated through the Secondary
Air System (SAS), inside the exhaust duct directly on the cylinder head.
Such system provides an addition of oxygen to the unburnt gases before entering the
catalytic converter, thus allowing for improved process effectiveness.
Irregular noises are prevented, by the presence of a control valve which by-passes
the SAS while the vehicle is decelerating.
In order to preserve the SAS, so to ensure its efficiency, the following maintenance
procedures should be carried out by and Authorised Piaggio Service Station:
125cc Engine - For this engine, the system consists of an internal, «A» and an ex-
ternal filter, «B». These should be cleaned every two years.
250cc Engine - This system features a single filter, «A» positioned inside the plastic
box, externally mounted onto the transmission cover. Cleaning is scheduled for every
12,000 Km.
The sponge filters should be cleaned with water and soap, and then dried with a clean
cloth and light jets of compressed air.
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