10. 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
fuel mixture
may also foul the spark plugs and cause hard starting.
High altitude
performance
can be improved
by installing
a smaller diameter
main
fuel jet in the
carburetor
and readjusting
the
pilot screw.
If you
always
operate
the engine at altitudeds
higher than 6,000
feet above sea
level,
have
an authorized
Honda
tractor
dealer
perform
this carburetor
modification.
Even with carburetor
modification,
engine horsepower
will decrease
about
3.5%
for each
1,000
feet increase
in altitude.
The effect
of altitude
on
horsepower
will be greater than this if no carburetor
modification
is made.
IMPORTANT NoT'CE 1 Once
a carburetor
is jetted
for high altitude
use,
operation
at lower altitudes
without
rejetting
may result in reduced
perfor-
mance,
overheating,
and serious
engine damage.
It is especially
important
to rejet a carburetor
when
going from a higher
altitude
to a lower
one.
At
lower
altitudes,
the
air/fuel
mixture
may
become
excessively
lean.
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