Beta RR 400 Operating Instructions Manual page 106

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DEVICES FOR E3 VERSION
The latest models are E3 type-approved
and they differ from prior approvals in that
three devices have been introduced:
AIS valve
It is called AIS 1 and it is an air intake
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system which allows to complete the
combustion of some unburned fuels
remaining from the thermodynamic cycle.
The catalytic converter
The catalytic converter is located at the
end of the exhaust pipe and is part of the
muffler, fixed to the exhaust pipe by spot
welding in two places.
Its function is to reduce the harmful
substances present in the exhaust fumes,
specifically CO (carbon monoxide), the
HC (unburned fuel) and the Nox (nitrogen
oxide).
Soundproof shell
This last device 2 located above the air
filter, has the function of reducing the
emission of polluting gases and sound thus
minimising noise pollution.
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