Carburetor Modification For High Altitude Operation - Honda EU20i Owner's Manual

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• 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 (5,000 feet), 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 300-meter (1,000-foot) increase in altitude. The
effect of altitude on horsepower will be greater than this if no
carburetor modification is made.
CAUTION:
Operation of the generator at an altitude lower than the carburetor is
jetted for may result in reduced performance, overheating, and serious
engine damage caused by an excessively lean air/fuel mixture.
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