Craftsman WEEDWACKER 358.799110 Operator's Manual page 16

= A ' . ............... i
Keep others away when making carburetor ad-
!
ustments.
III
A WARr G ]
Serious i_ury to the operator and others can oc-
cur if the carburetor is not properly adjusted.
D. CARBURETOR ADJUST1KENTS
This is a complicated task. Read all warnings and instructions thoroughly before starting ad-
justments. If you do not think that you completely understand all _ and instructions, let your
SEARS Service Center/Department perform these adjustments.
2. BASIC CARBURETOR SETTINGS
NOTE: In most cases, your engine can be made to
run properly with minor carburetor adjustments.
Refer to "Trouble Shooting Suggestions" in the
lef_ column for the condition you are experiencing
and follow the instructions. The basic carburetor
se_ are provided below ....
a Turn the mixture screw (Hgure 24 ) c]oc.=._vJse
..... until it stops. Do notturn t_ screw until itis
tight as damage to theneedle seat can occur.
b. Turn the mixture screw between three-quar-
ters and one fiflt turn counterclockwise.
3. ADJUSTING PROCEDURE
a. PREPARATION
• The carburetor has been carefully adjusted
at the factory. However, the operator must
tions'.
• Very small adjustments can affect engine
performance. It
is
important to turn the screw a
very small amount per adjustment and test per-
formance before making further adjustments.
Each adjustment should be no more than the
width of the slot in the adjusting screw.
• This is a complicated task and it is impor-
tant to follow instructions in sequence as
indicated.
1. TROUBLE SHOOTING SUGGESTIONS
- Engine will not continue to run at idle posi-
tion. See "Idle Speed Adjustment" and "Low
Speed Mixture Adjustment."
- Engine dies or hesitates when it should accel-
erate. See '_cceleration Check."
- Loss of cutting power wblch camuot be cor-
:rected by cleaning the air filter. See "High
Speed Mixture Adjustment."
- Engine does not return to idle from full throt_
tle within 2 seconds. See "Deceleration
Check."
- Engine w_ not rur_.See =Trouble Shooting
Chart." Then, if the carburetor requires ad-
justment, begin with "Basic Carburetor Set-
tings."
IT h e trimmer line will be spinning during this
]procedure. Wear your protective equipment and
[observe all safety instructions.
- 16-
1. Use a fresh fuel mi_ See "FuelingYour En-
. • gme? _
2. Make sure the line extends to the length a!-
lowed by the line limiter to provide correct
load on engine.
3.: Start the engine. Cut grass for 3 minutes to
warm en_ne. The engine must be at operat-
ing temperature before carburetor adjust-
- mentscan beperformed correctly.
b. IDLE SPEED ADJUSTMENT
1. Allow engine to idle.
2. Adjust idle speed screw (Figure 24 ) unti!
the engine continues to run without stall-
rag.
- Turn screw clockwise to increase engine
speed if the engine stalls or dies.
- Turn screw counterclockwise to slow en-
down.
3. Follow instructions in '_cceleration
Check" and "Deceleration Check."
4. No further adjustments are necessary if
performance is satisfactory.
e. ACCELERATION CHECK
1. Allow engine to idle.
2. Squeeze trigger fully
a If performance is satisfactor_ pro-
ceed to "d. Deceleration Check."
b. If the eng_e does not accelerate
smoothl_ turn the MixtureScrew (Fig-
lLre 24 ) counterclo_e a small
amount (no more than the width of the
slot in the adjusting screw).
3. Repeat step "2." until smooth acceleration
is obtained.
It may be necessary to repeat _Idle Speed
Adjustment" through '_cceleration Check," to
obtain correct adjustments.
4, Follow Lustructions in "Deceleration
Checl_"