HIGH ALTITUDE
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 on gasoline engines 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 unit at altitudes above 5,000 feet
(1,500 meters), have your 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 alti-
tude on horsepower will be greater than this if no carburetor modification is
made.
NOTE: When the carburetor has been modified for high altitude opera-
tion, the air/fuel mixture will be too lean for low altitude use. Opera-
tion 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.
Operator's Manual
INSTALLATION
19