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Exaust emissions are controlled by the
design of the fundamental engine para-
meters and components (e.g. carbu-
ration, ignition, timing and valve or part
timing) without the addition of any major
hardware.
The carburetor comes with a standard
setting.
This is the optimum setting to ensure
your machine will operate reliably with
the lowest possible emission under most
operating conditions.
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If it is necessary to readjust the car-
buretor from scratch, first carry out the
standard setting.
Turn
+
high speed adjusting screw and
/
low speed adjusting screw
counterclockwise (richer)
or as far as stop.
If you don't have a tachometer, do not
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set the highspeed adjusting screw any
leaner by turning it beyond the standard
setting.
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Slight correction PD\ be necessary.
Use a WDFKRPHWHU to set the high speed
adjusting screw + to obtain the highest
possible engine speed. From that
position, turn the high speed adjusting
screw + 1/8 counterclockwise (richer)
or as far as stop. Avoid risk of engine
damage which can be caused by lack of
lubrication and overheating -
•
Check air filter and clean it if
necessary.
•
Set idle speed correctly.
•
Warm up the engine.
Turn the high speed adjusting
screw + and low speed adjusting
screw / clockwise (leaner) at
higher altitudes.
Turn the screws very slowly and
carefully - slight changes have a
noticeable effect on the engine's
running behavior.
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The high speed adjusting screw +
alters the power output and
maximum off-load engine speed.
If you turn this screw too far clock-
wise and make the setting too lean,
there is a risk of engine damage.
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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
the engine runs smoothly.
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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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