Carburetor Modification For High Altitude Operation - Honda ER2500CX Owner's Manual

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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
1,500 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 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 authorized Honda servicing dealer return the
carburetor to original factory specifications.
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