Manual Honda Honda Engines GX25 (page 17 of 60) (English)

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ENGLISH

Carburetor Modifications for High Altitude Operation

Tampering and Altering

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

Emission Control System Information

Source of Emissions

Problems That May Affect Emissions

Replacement Parts

METHANOL

MTBE

ETHANOL

Oxygenated Fuels

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.

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.

Tampering with or altering the emission control system may

increase emissions beyond the legal limit. Among those acts that

constitute tampering are:

The following instructions and procedures must be followed in

order to keep the emissions from your Honda engine within the

emission standards.

EPA, California and Canadian regulations require all

manufacturers to furnish written instructions describing the

operation and maintenance of emission control systems.

Honda utilizes lean carburetor settings and other systems to

reduce the emissions of carbon monoxide, oxides of nitrogen, and

hydrocarbons.

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

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.

Altering or defeating the governor linkage or speed-adjusting

mechanism to cause the engine to operate outside its design

parameters.

Removal or alteration of any part of the intake, fuel, or exhaust

systems.

If you are aware of any of the following symptoms, have your

engine inspected and repaired by your servicing dealer.

Black exhaust smoke or high fuel consumption.

Afterburning (backfiring).

Misfiring or backfiring under load.

Rough idle.

Hard starting or stalling after starting.

(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.

(methyl tertiary butyl ether) 15% by volume

You may use gasoline containing up to 15%

MTBE by volume.

(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.

The following are the EPA approved percentages of oxygenates:

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

Some states/provinces require this information to be posted on

the pump.

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

minimum octane rating requirements.

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.

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.

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.

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.

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.

05/12/16 15:03:11 32Z6J600_017

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Honda Honda Engines GX25 Manual

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