Carburetor Modifications For High Altitude Operation; Emission Control System Information; Source Of Emissions; The U.s. And California Clean Air Acts, And Environment And Climate Change Canada (Eccc) - Honda GX240 Manual De Propietario

Carburetor Modifications for High Altitude Operation

At high altitude, the standard carburetor air-fuel mixture will be too rich.
Performance will decrease, and fuel consumption will increase. A very
rich mixture will also foul the spark plug and cause hard starting.
Operation at an altitude that differs from that at which this engine was
certified, for extended periods of time, may increase emissions.
High altitude performance can be improved by specific modifications to
the carburetor. If you always operate your engine at altitudes above
610 meters (2,000 feet), have your servicing dealer perform this
carburetor modification. This engine, when operated at high altitude
with the carburetor modifications for high altitude use, will meet each
emission standard throughout its useful life.
Even with carburetor modification, engine horsepower will decrease
about 3.5% for each 300 meter (1,000 foot) increase in altitude. The effect
of altitude on horsepower will be greater than this if no carburetor
modification is made.
When the carburetor has been modified for high altitude operation, the air-
fuel mixture will be too lean for low altitude use. Operation at altitudes below
610 meters (2,000 feet) with a modified carburetor may cause the engine to
overheat and result in serious engine damage. For use at low altitudes, have
your servicing dealer return the carburetor to original factory specifications.

EMISSION 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 appropriate air/fuel ratios and other emissions control
systems to reduce the emissions of carbon monoxide, oxides of nitrogen,
and hydrocarbons.
Additionally, Honda fuel systems utilize components and control
technologies to reduce evaporative emissions.
The U.S. and California Clean Air Acts, and Environment and Climate
Change Canada (ECCC)
U.S. EPA, California and Canadian regulations require all manufacturers to
furnish written instructions describing the operation and maintenance of
emission control systems.
The following instructions and procedures must be followed in order to
keep the emissions from your Honda engine within the emission
standards.

Tampering and Altering

Tampering is a violation of federal and California law.
Tampering with or altering the emission control system may increase
emissions beyond the legal limit. Among those acts that constitute
tampering are:
• Removal or alteration of any part of intake, fuel, or exhaust systems.
• Alterations that would cause the engine to operate outside its design
parameters.

Problems That May Affect Emissions

If you are aware of any of the following symptoms, have your engine
inspected and repaired by your authorized Honda Power Equipment
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, California (models
certified for sale in California only), and Canadian emissions regulations.
We recommend the use of Honda Genuine 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. Honda cannot deny coverage under the
emission warranty solely for the use of non-Honda replacement parts or
service performed at a location other than an authorized Honda
dealership; you may use comparable EPA certified parts, and have service
performed at non-Honda locations. However, 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

As the power equipment engine owner, you are responsible for
completing all required maintenance listed in your owner's manual.
Honda recommends that you retain all receipts covering maintenance on
your power equipment engine, but Honda cannot deny warranty
coverage solely for the lack of receipts or for your failure to ensure that all
scheduled maintenance has been completed.
Follow the "MAINTENANCE SCHEDULE" on page 7.
Remember that this schedule is based on the assumption that your
Honda engine product will be used for its designed purpose. Sustained
high-load or high-temperature operation, or use in dusty conditions, will
require more frequent service.

Air Index

(Models certified for sale in California)
An Air Index Information label is applied to engines certified to an
emission durability time period in accordance with the requirements of
the California Air Resources Board.
The bar graph is intended to provide you, our customer, the ability to
compare the emissions performance of available engines. The lower the
Air Index, the less pollution.
The durability description is intended to provide you with information
relating to the engine's emission durability period. The descriptive term
indicates the useful life period for the engine's emission control system.
See your "EMISSION CONTROL SYSTEM WARRANTY" (see page 18) for
additional information.
Descriptive Term
Moderate
Intermediate
Extended
1,000 hours (225 cc and greater)
ENGLISH
Applicable to Emissions Durability Period
50 hours (0–80 cc, inclusive)
125 hours (greater than 80 cc)
125 hours (0–80 cc, inclusive)
250 hours (greater than 80 cc)
300 hours (0–80 cc, inclusive)
500 hours (greater than 80 cc)
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