Catalytic Muffler; Exhaust Muffler - APRILIA SR 50 Use And Maintenance Book

APRum_SR50ie##ED04_##US.book Page 47 Friday, February 18, 2005 5:32 PM
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If the tires are new, they may still be
covered with a slippery film: drive
carefully for the first few miles. Do not
oil the tires with unsuitable fluids.
MINIMUM TREAD DEPTH LIMIT (3)
front:.................................... 0.12 in (3 mm)
rear: .................................... 0.12 in (3 mm)
However, the minimum tread depth must
not be less than prescribed by regulations
in force in the country where the vehicle is
used.

CATALYTIC MUFFLER

WARNING
Do not park the vehicle (catalytic version)
close to dried brushwood or in places
where children are likely to come in
contact with it, because the catalytic
muffler heats to very high operating
temperature. Be very careful and avoid
any contact until it has cooled down.
The catalytic version of this vehicle mounts a
muffler with a "platinum-rhodium" two-way
metal catalytic converter.
This device provides for the oxidation of the
CO (carbon monoxide) and of the HC
(unburned hydrocarbons) contained in the
exhaust gases, changing them into carbon
dioxide and steam, respectively.
The high temperature of the exhaust gas due
to the catalytic reaction also burns oil particles,
keeping the muffler clean and eliminating
smoke.
To ensure long trouble-free operation of the
catalytic converter and to reduce problems
relating the fouling of the thermal unit and of
the exhaust, avoid covering long distances
with the engine running constantly at a low
rpm.
It is sufficient to alternate these periods with
periods in which the engine runs at relatively
high rpm, even if only for a few seconds, but
rather frequently.
The recommendations above are especially
important when cold starting the engine. In
this case, the rpm suitable for "triggering" the
catalytic reaction are easily reached, but it is
important to ensure that the cylinder
temperature is at least 122 °F (50 °C); this
takes place a few seconds after starting.
CAUTION
Use unleaded fuel only. Lead will damage
the catalytic converter.

EXHAUST MUFFLER

WARNING
Tampering with the noise control
system is prohibited.
Owners are warned that the law may prohibit:
– The removal or disconnection of any device or
element of design incorporated into any new
vehicle to limit the noise emissions before its
sale or delivery to the final purchaser or while it
is in use except if carried out for maintenance,
repair or replacement purposes;
– the use of the vehicle after such device or
element of design has been removed or
rendered inoperative by any person.
Check the exhaust muffler and the muffler
pipes, to make sure that they show no traces
of rust or holes and that the exhaust system is
operating properly.
If the exhaust system noise increases, contact
an aprilia Authorized Dealer immediately.
use and maintenance SR 50 47