TECHNICAL & CONSUMER INFORMATION
68
EMISSION CONTROL SYSTEM

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., 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 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.
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