Honda HHT31S Owner's Manual page 58

TECHNICAL & CONSUMER INFORMATION
Emissions Control System Information
Source of Emissions
The combustion process produces carbon
monoxide, oxides of nitrogen, and hydrocarbons.
Control of hydrocarbons and oxides of nitrogen 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 it is toxic.
Honda utilizes lean carburetor settings and other
systems to reduce the emissions of carbon
monoxide, oxides of nitrogen, and hydrocarbons.
The U.S. and California Clean Air Acts
EPA and California regulations require all
manufacturers to furnish written instructions
describing the operation and maintenance of
emissions control systems.
The following instructions and procedures must
be followed in order to keep the emissions from
your Honda engine within the emissions
standards.
Tampering and Altering
Tampering with or altering the emissions control
system may increase emissions beyond the legal
limit. Among those acts that constitute tampering
are:
Removal or alteration of any part of the intake,
fuel, or exhaust systems.
Altering or defeating the speed-adjusting
mechanism to cause the engine to operate
outside its design parameters.
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Problems That May Affect Emissions
If you are aware of any of the following
symptoms, have your engine inspected and
repaired by your servicing dealer.
•
Hard starting or stalling after starting
•
Rough idle
•
Misfiring or backfiring under load
•
Afterburning (backfiring)
•
Black exhaust smoke or high fuel
consumption
Replacement Parts
The emissions control systems on your new
Honda engine were designed, built, and certified
to conform with EPA and California emissions
regulations. We recommend the use of genuine
Honda parts whenever you have maintenance
done. These original-design replacement parts
are manufactured to the same standards as the
original parts, so you can be confident of their
performance. The use of replacement parts that
are not of the original design and quality may
impair the effectiveness of your emissions control
system.
A manufacturer of an aftermarket part assumes
the responsibility that the part will not adversely
affect emissions performance. The manufacturer
or rebuilder of the part must certify that use of the
part will not result in a failure of the engine to
comply with emissions regulations.
Maintenance
Follow the MAINTENANCE SCHEDULE on
page 25. Remember this schedule is based on
the assumption that your machine will be used for
its designed purpose. Sustained high-load or
high-temperature operation, or use in unusually
wet or dusty conditions, will require more
frequent service.