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OPERATION
High Altitude Use
Carburetor Modification
When carburetor has been modified for high altitude operation, the air-
fuel mixture will be too lean for low altitude use and may cause engine
damage.
At high altitude, the standard carburetor air-fuel mixture will be
excessively 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 different than that which this
engine was certified, for extended periods of time, may increase
emissions.
High altitude operation can be improved by specific modifications to the
carburetor. If always operating the generator at altitudes above 5000 feet
(1500 meters), have an authorized POLARIS servicing supplier perform
the carburetor modification. The engine will meet each emission
standard throughout its life when operated at high altitude with the
carburetor modifications for high altitude operation.
With the carburetor modification, engine horsepower will decrease by
about 3.5% for every 1000 feet (300 meters) increase in altitude. The
effect of altitude on horsepower will be greater if no carburetor
modification is made.
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. Be sure
to have any modification reversed at lower altitudes.