Mineral oil with specific additives for increased adhesiveness
03_13
03_14
Secondary air system (03_13, 03_14)
In order to reduce polluting emissions, the vehicle is furnished with a catalytic con-
verter in the muffler.
To favour the catalytic process, an extra amount of oxygen is added to the exhaust
through a secondary air system (SAS).
This system allows more oxygen to be added to the unburned gas before it reaches
the converter, thus improving the action of the catalytic converter.
The air enters the head through an exhaust tube and is purified by 2 filters, one internal
"A" and one external "B".
The system is provided with a control valve that prevents its functioning while decel-
erating, to avoid unwanted noise.
To ensure the best functioning of the SAS system, every two years the scooter should
be taken to an authorised Piaggio service centre to have the filters cleaned (Sched-
uled maintenance section).
The filter sponge should be cleaned with water and mild soap, then it should be dried
with a cloth and slight blows of compressed air.
03_15
Cooling fluid level (03_15, 03_16)
The engine cooling takes place through a forced fluid circulation system. The cooling
circuit contains around 1.8 l of cooling fluid consisting of a mixture of 50% de-ionised
water and ethylene glycol and corrosion inhibitors based antifreeze solution.
The system has a coolant temperature indicator.
Under normal running conditions, the digital instrument indicator must light up to its
7th/ 8th segment.
When the 10th segment lights up, the icon and the bars start flashing; if this is the
case, stop the engine and let it cool off; then check the fluid level. If the fluid level is
42
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