Your carburetor is preset at the factory.
This is the optimum setting under the
barometric pressure and climatic
conditions at the factory and is suitable
for most operating sites.
It ensures that your machine will run
smoothly, be fuel efficient, operate
reliably and produce low emissions.
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Slight readjustment of the carburetor
may be necessary:
•
Check the air filter
and clean it if necessary.
•
Check spark arresting screen (if
fitted) and clean it if necessary.
•
Mount the cutting head and trim
lines to correct length:
Lines must extend as far as
line limiting blade on the deflector.
•
Start the engine and adjust idling
speed correctly with the idle speed
adjusting screw
/$
-
the cutting tool must not rotate.
•
Warm up the engine.
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Turn the high speed adjusting
screw
+
and low speed adjusting
screw
/
clockwise (leaner) or as
far as stop.
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Turn the high speed adjusting
screw
+
and low speed adjusting
screw
/
counterclockwise (richer)
or as far as stop.
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It is usually necessary to change
the setting of the idle speed
adjusting screw
/$
after every
correction to the low speed
adjusting screw
/
.
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Turn the idle speed
adjusting screw
/$
clockwise until engine runs
smoothly - cutting
tool must not rotate.
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Turn the idle speed adjusting
screw
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counterclockwise until
cutting tool stops rotating -
then back off screw about
another one half turn from that
position.
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Idle setting is too lean.
Turn the low speed adjusting
screw
/
counterclockwise until
engine runs and accelerates
smoothly.
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Exhaust emissions are controlled by the
design of the fundamental engine
parameters and components
(e.g. carburetion, ignition, timing and
valve or port timing) without the addition
of any major hardware.
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