Carburetor Adjustment - Little Wonder 2230S Manuel D'instructions

SERvICE

Carburetor Adjustment

GENERAL
NOTE: The diaphragm carburetor has three external
adjustments. Each adjustment affects the others.
The idle speed adjustment screw controls the throttle
opening at idle position.
The low (LO) speed adjustment screw controls the
volume of fuel mixture at low engine speed. It also con-
trols the supplementary fuel required to obtain smooth
progression from idling to high speed.
The high (HI) speed adjustment screw controls the
volume of fuel mixture at full throttle.
CARBURETOR AdjUSTMENT
Every unit is run at the factory and the car bu re tor is set
in compliance with EPA Phase I / California Emis sion
Reg u la tions. In addition, the carburetor is equipped with
HI and LO needle adjustment limiters that prevent settings
outside acceptable limits. Limiter caps must remain or
be replaced on both the Hi and Lo carburetor adjusting
screws. There is no limiter cap on the idle screw.
NOTE: The needle screws have a sharp point. To avoid
damage to the carburetor, do not use excessive force.
a. Before adjusting carburetor clean or replace air filter
and muffler, "Spark Arrestor Screen".
b. Make sure the cutting attachment such as hedge
clipper blades are properly adjusted.
HI
LOW
IDLE SCREW
c. Start engine and run several minutes to bring to oper-
ating temperature. Flash choke twice during warm-up
to clear any air from the fuel system.
NOTE: The Idle speed screws may have to be re-adjusted
to keep engine from stalling. The Engine must be at
normal operating temperature to adjust properly.
14
d. Stop engine. Turn HI speed needle counter-clockwise
to stop. Turn LO speed needle midway between full
clockwise stop and counter-clockwise stop.
e. Idle Speed Adjustment Units with Cutting Attach-
ments. Turn "idle" speed adjustment screw CW
(clockwise) until cutting at tach ment begins to turn,
then turn screw out CCW (counter clockwise) until
at tach ment stops turning. Turn screw out, CCW, an
additional 1/4 turn.
f. Start unit and accelerate to full throttle for 2-3 seconds
to clear any excess fuel in the engine, then return to idle.
Accelerate engine to full throttle to check for smooth
transition from idle to high speed. If engine hesitates
turn LO needle CCW 1/8 turn and repeat acceleration.
Con tin ue ad just ment until smooth ac cel er a tion results.
g. Check idle speed and reset if necessary as described in
"item e" above. If a tachometer is available idle speed
should be set as specified in the Owner's Manual.
Important: Do not run the engine at full throttle or with no
load for more than 5-6 seconds to avoid engine damage.
Note: This hedge trimmer is equipped with a speed
limiting carburetor (the high speed circuit has a by-pass
system). With this feature the engine will continue to
run even with the high speed adjusting screw turned all
the way in. Although the engine will continue to run, it
will only produce full power with the HI adjusting screw
opened to about 3/8 to 1/2 turn.
Keep hands away from the blades while
servicing the hedge trimmer. Be sure the trimmer
is secured and blades are guarded while making
adjustments.
Notes
LITTLE
WONDER
TRImmER