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 generator
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 ef-
fect of altitude on horsepower will be greater than this if no carburetor
modification is made.
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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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