Honda Motor EG1000 Manual Del Propietário página 54

TECHNICAL INFORMATION
CARBURETOR MODIFICATION 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 generator at altitudes
above 610 meters, have your authorized Honda servicing dealer
perform this carburetor modification.
Even with carburetor modification, engine horsepower will decrease
about 3.5% for each 300 meter increase in altitude. The effect of
altitude on horsepower will be greater than this if no carburetor
modification is made.
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 610 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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