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SETTING
CAUTION:
The carburetor is extremely sensitive to
G
foreign matter (dirt, sand, water, etc.).
During installation, do not allow foreign
matter to get into the carburetor.
Always handle the carburetor and its
G
components
scratches, bends or damage to carbure-
tor parts may prevent the carburetor from
functioning correctly. Carefully perform
all servicing with the appropriate tools
and without applying excessive force.
When the engine is stopped or when
G
riding at no load, do not open and close
the throttle unnecessarily. Otherwise, too
much fuel may be discharged, starting
may become difficult or the engine may
not run well.
After installing the carburetor, check that
G
the throttle operates correctly and opens
and closes smoothly.
Atmospheric conditions and carburetor
settings
Air temp.
Humidity
High
High
Low
Low
The air density (i.e., concentration of oxygen
in the air) determines the richness or lean-
ness of the air/fuel mixture. Therefore, refer
to the above table for mixture settings.
That is:
Higher temperature expands the air with its
G
resultant reduced density.
Higher humidity reduces the amount of oxy-
G
gen in the air by so much of the water vapor
in the same air.
Lower atmospheric pressure (at a high alti-
G
tude) reduces the density of the air.
7 - 2
T U N
carefully.
Even
Air
pressure
Mixture
Setting
(altitude)
Low (high)
Richer
Leaner
High (low)
Leaner
Richer
slight
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