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 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 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 uesful 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
serious engine damage.
For use at low altitudes, have your servicing dealer return the
carburetor to original factory specifications.
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