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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 carbur
etor. If you always operate your generator at altitudes above
5,000 feet (1,500 meters), 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 1,000-foot (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 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.
31Z238010.book 65 ページ 2014年1月27日 月曜日 午後12時20分
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