Carburetor Adjustment Mixture (cont’d)
1.
The high speed mixture screw (see Fig. 34)
controls the fuel flow requirements during
the engine’s optimum demand. With the
engine running at operating temperature, the
choke fully opened and, no load applied to
the engine, turn the high speed mixture
screw to obtain the highest
RPM.
This should
be approximately
2%
to 3% turns out from
fully closed.
Turning the screw clockwise will make the
air/fuel mixture lean (less fuel/more air).
Turning the screw counterclockwise will
make the air/fuel mixture rich (morefuel/less
air).
IMPORTANT Turning the high speed mix-
ture screw in too tightly may damage the tip.
Carburetor Adjustment Throttle Valve
CAUTION!
Be sure
to
wear
safety glasses when using
compressed air.
1.
Remove two
(2)
screws securing the air
cleaner cover to the trimmer and remove the
air cleaner as an assembly.
2.
Squeeze the throttle trigger and note the
travel of throttle valve in the carburetor open-
ing. The throttle valve should travel to the top
of
the carburetor opening when the trigger is
in full throttle position.
18
3. To adjust, loosen the jam nut on the throttle
cable and rotate the turnbuckle to increase or
decrease the travel of the throttle valve. See
Fig. 35.
TURNBUCKLE
JAM
NUT
Figure 35
4. Once adjusted, tighten the jam nut and
recheck the adjustment.
5.
Reinstall the air cleaner cover assembly and
secure using the two screws with flat washers
and lock washers.
6.
Check the idlle
speed
and adjust
if
necessary.
Refer to
Carburetor Adjustment Idle Speed,
page
17.
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