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TECHNICAL & CONSUMER INFORMATION
CarburetorModification for High Altitude Operation
At high altitude, the standard carburetor air-fuel mixturewill be too
rich. Performancewill decrease, and fuel consumption will increase. A
very rich mixture willalso f oulthe 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 pumpat altitudes a bove
5,000 feet (1,500 meters) have yourservicing dealer perform this
carburetor modification.This engine, when operated at high altitude
with the caruburetor modifications for high altitude use, will meet
each emission standard throughoutits usef ul 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 seriousengine damage.
For use at low altitudes, have your servicing dealer return the
carburetor to original factory specifications.
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