Manual Honda Honda Engines GXV390 (page 15 of 54) (English)

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ENGLISH

Emission Control System Information

Source of Emissions

Tampering and Altering

Problems That May Affect Emissions

Replacement Parts

Maintenance

The U.S., California Clean Air Acts and Environment Canada

Oxygenated Fuels

ETHANOL

MTBE

METHANOL

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.

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 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.

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.

The emission control systems on your Honda engine were

designed, built, and certified to conform with EPA, California and

Canadian emission 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

emission control system.

A manufacturer of an aftermarket part assumes the responsibility

that the part will not adversely affect emission 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

emission regulations.

Follow the maintenance schedule on page . Remember that 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.

Some conventional gasolines are being blended with alcohol or an

ether compound. These gasolines are collectively referred to as

oxygenated fuels. To meet clean air standards, some areas of the

United States and Canada use oxygenated fuels to help reduce

emissions.

If you use oxygenated fuel, be sure it is unleaded and meets the

minimum octane rating requirements.

Before using an oxygenated fuel, try to confirm the fuel’s contents.

Some states/provinces require this information to be posted on

the pump.

The following are the EPA approved percentages of oxygenates:

(ethyl or grain alcohol) 10% by volume

You may use gasoline containing up to 10%

ethanol by volume. Gasoline containing

ethanol may be marketed under the name

Gasohol.

(methyl tertiary butyl ether) 15% by volume

You may use gasoline containing up to 15%

MTBE by volume.

(methyl or wood alcohol) 5% by volume

You may use gasoline containing up to 5%

methanol by volume as long as it also

contains cosolvents and corrosion inhibitors

to protect the fuel system. Gasoline

containing more than 5% methanol by

volume may cause starting and/or

performance problems. It may also damage

metal, rubber, and plastic parts of your fuel

system.

If you notice any undesirable operating symptoms, try another

service station or switch to another brand of gasoline.

Fuel system damage or performance problems resulting from the

use of an oxygenated fuel containing more than the percentages

of oxygenates mentioned above are not covered under the

Distributor’s Limited Warranty

05/04/12 20:12:59 32Z5N600_015

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Honda Honda Engines GXV390 Manual

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