K -TECHNICAL INFORMATION

This section contains important information about serial number

locations, high altitude operation, and emission control systems.

Serial Number Locations

ENGINE

SERIAL

NUMBER

FRAME

SERIAL

NUMBER

There are two serial numbers, one for the trimmer and one for the

engine. Record these numbers in the space provided. You will need to

have these numbers available when ordering parts or making

technical or warranty inquiries

Engine serial number: _____________________________

Frame serial number: ______________________________

Date of purchase: _________________________________

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 trimmer at altitudes

above 5,000 feet (1,500 meters), 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 1,000-foot (300-meter) increase in altitude. The

effect of altitude on horsepower will be greater than this if no

carburetor modification is made.

NOTICE

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 5,000 feet (1,500 meters) 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.

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.

Esco utilizes appropriate air/fuel ratios and other emission control

systems to reduce the emissions of carbon monoxide, oxides of

nitrogen, and hydrocarbons. Additionally, Esco 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 Esco 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 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

Replacement Parts

The emission control systems on your new Esco engine were

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

Canadian emission regulations. We recommend the use of Esco

Genuine 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 emissions 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.

Maintenance

Follow the MAINTENANCE SCHEDULE. Remember 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

Air Index

An Air Index Information hang tag/label is applied to engines certified

to an emission durability time period in accordance with the

requirements of the California Air Resources Board.

The bar graph is intended to provide you, our customer, the ability to

compare the emissions performance of available engines. The lower

the Air Index, the less pollution.

The durability description is intended to provide you with information

relating the engine’s emission durability period. The descriptive term

indicates the useful life period for the engine’s emission control

system. See your EMISSION CONTROL SYSTEM WARRANTY

for additional information.

SPECIFICATIONS