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 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.
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
(7,500
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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