Honda GX630 Owner's Manual page 12

High Altitude Operation
The LPG/NATURAL GAS-fueled engine does not require any
modifications for high-altitude operation. However, performance
and horse power will decrease at high altitudes.
Fuel Regulator Information
This engine is certified to comply with U.S. EPA and CARB
(California Air Resources Board) emission regulations using the
Impco Beam regulator specified in the installation instructions (see
below).
Honda used this regulator and other specific parts and adjustments
to demonstrate compliance with the emission regulations.
Adjustable fuel system parts must have U.S. EPA and CARB
approved tamper resistant features to limit the available adjustment
after the fuel system is correctly installed.
If an equipment manufacturer did not install your engine in a
product, you will need the installation instructions for the Honda
certified system (see below).
If you choose not to use the Honda fuel system, you must use a
system that has been certified by the fuel system manufacturer to
be used on this Honda engine.
Or, if you use a fuel system that is not already certified, you must
have certification test data satisfactory to the U.S. EPA or CARB.
The test data must prove the system will meet the emission
standard both when the engine is new and at the end of its
emission durability period (hours).
To obtain a copy of the installation instructions for this engine,
contact an independent Honda engine distributor.
12
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., California Clean Air Act, and Environment Canada
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 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 the intake, fuel, or exhaust
systems.
• Altering or defeating the governor linkage or speed-adjusting
mechanism to 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 servicing dealer.
• Hard starting or stalling after starting.
• Rough idle.
• Misfiring or backfiring under load.
• Afterburning (backfiring).
• Black exhaust smoke or high fuel consumption.
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