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John Deere AC-G4010S User Manual

Page 16

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Preparing the Generator

16

Operator’s Manual

HIGH ALTITUDE

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

generator at altitudes above 5,000 feet (1,500 meters),

have your 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.

NOTE: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.

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