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TECHNICAL
&
CONSUMER 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 plugs 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 engine at altitudes above
5,000
feet (1,500 meters), have your 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.
I
NOTICE
I
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.
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