Ducati MONSTER Owner's Manual page 82

Noise and exhaust emission control system
information
Source of Emissions
The combustion process produces carbon monoxide and
hydrocarbons. Control of hydrocarbons is very important
because under certain conditions, they react to form
photochemical smog when subjected to sunlight. Carbon
monoxide does not react in the same way, but is toxic.
E Ducati utilizes lean carburetor settings and other systems
to reduce carbon monoxide and hydrocarbons.
Exhaust Emission Control System
The Exhaust Emission Control System is composed of
lean carburetor settings, and no adjustments should be
made except idle speed adjustments with the throttle
stop screw. The Exhaust Emission Control System is
separate from the crankcase emission control system.
Crankcase Emission Control System
The engine is equipped with a closed crankcase system
to prevent discharging crankcase emissions into the
atmosphere. Blow-by gas is returned to the combustion
chamber through the air cleaner and the throttle body.
Evaporative Emission Control System
California motorcycles are equipped with an evaporative
emission control system which consists of a charcoal
canister and associated piping. This system prevents the
escape of fuel vapors from the throttle body and fuel
tank.
82
Tampering warning
Tampering with Noise Control System Prohibited. Federal
Law prohibits the following acts or causing thereof:
(1) the removal or rendering inoperative by any person,
other than for purposes of maintenance, repair, or
replacement, of any device or element of design
incorporated into any new vehicle for the purpose of
noise control prior to its sale or delivery to the ultimate
purchaser or while it is in use; or
(2) the use of the vehicle after such device or element of
design has been removed or rendered inoperative by any
person.
Among those acts presumed to constitute tampering
are the acts listed below:
(1) Removal of, or puncturing the muffler, baffles, header
pipes or any other component which conducts exhaust
gases.
(2) Removal or puncturing of any part of the intake
system.
(3) Lack of proper maintenance.
(4) Replacing any moving part of the vehicle, or parts of
the exhaust or intake system, with parts other than those
specified by the manufacturer.
This product should be checked for repair or replacement
if the motorcycle noise has increased significantly
through use. Otherwise, the owner may become subject
to penalties under state and local ordinances.