High Altitude Operation - Honda EM25 Manuel De L'utilisateur

• High altitude operation

At high altitude, the standard carburetor air-fuel mixture will be
excessively rich. Performance will decrease, and fuel consumption will
increase.
High altitude performance can be improved by specific modifications to
the carburetor. If you always operate the generator at altitudes higher
than 1,500 meters (5,000 feet) above sea level, have your authorized
Honda dealer perform these carburetor modifications.
Even with suitable carburetor jetting, engine horsepower will decrease
approximately 3.5% for each 300 meter (1,000 foot) increase in
altitude. The affect of altitude on the 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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