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

• Carburetor Modification for High Altitude Operation
At high altitude, the standard carburetor air-fuel mixture will be too
richo Performance will decrease, and fuel consumption will increase. A
very rich mixture will also foul the spark pi ug 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 authorized Honda 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 ,OOO-foot) increase in altitude. The ef-
fect 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 eng ine damage caused by an excessively lean air/fuel mixture.
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