Technical & Consumer Information; Serial Number Location; Remote Control Linkage; Carburetor Modifications For High Altitude Operation - Honda GX25 Owner's Manual

TECHNICAL & CONSUMER INFORMATION
TECHNICAL INFORMATION

Serial Number Location

See Figure 19, page A-4.
Record the engine serial number [1], type [2] and purchase date
in the spaces below. You will need this information when
ordering parts and when making technical or warranty inquiries.
Engine serial number: __ __ __ __ — __ __ __ __ __ __ __
Engine type: ___ ___ ___ ___
Date Purchased: ______ / ______ / ______

Remote Control Linkage

See Figure 20, page A-4.
The throttle control lever is provided with a fitting for cable
attachment [1].
Remove the air cleaner cover (see page 5) for access to the
throttle lever and cable fitting.
Attach the throttle cable as shown in the illustration.
To adjust the throttle cable, follow the equipment
manufacturer's instructions.

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 1,500 meters (5,000 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 feet) 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 1,500 meters (5,000 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.
10

Emission Control System Information

Emission Control System Warranty
Your new Honda complies with both the U.S. EPA and State of
California emission regulations. American Honda provides the
same emission warranty coverage for Honda Power Equipment
engines sold in all 50 states. In all areas of the United States,
your Honda Power Equipment engine is designed, built, and
equipped to meet the U.S. EPA and California Air Resources
Board emission standard for spark ignited engines.
Warranty Coverage
Honda Power Equipment engines certified to CARB and EPA
regulations are covered by this warranty to be free from defects
in materials and workmanship that may keep it from meeting
the applicable EPA and CARB emissions requirements for a
minimum of 2 years or the length of the
Equipment Distributor's Limited Warranty
from the original date of delivery to the retail purchaser. This
warranty is transferable to each subsequent purchaser for the
duration of the warranty period.
Warranty repairs will be made without charge for diagnosis,
parts, and labor. Information about how to make a warranty
claim, as well as a description of how a claim can be made and/
or how service can be provided, can be obtained by contacting
an authorized Honda Power Equipment dealer or by contacting
American Honda at the following:
Email: powerequipmentemissions@ahm.honda.com
Telephone: (888) 888-3139
The covered components include all components whose failure
would increase an engine's emissions of any regulated pollutant
or evaporative emissions. A list of specific components can be
found in the separately included emissions warranty statement.
Specific warranty terms, coverage, limitations and manner of
seeking warranty service are also set forth in the separately
included emissions warranty statement. In addition, the
emissions warranty statement can also be found on the Honda
Power equipment website or at the following link:
http://powerequipment.honda.com/support/warranty
Source of Emissions
The combustion process produces carbon monoxide, oxides of
nitrogen, and hydrocarbons. Control of hydrocarbons and
oxides of nitrogen are 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 Honda engine emissions within the emission
standards.
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