Craftsman 358.798141-28.0cc Operator's Manual download pdf (Page 16)

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€. CARBURETOR ADJUSTMENTS

AWARNING

Make carburetor adjustments with the drive shaft hous-

ingsupportedtopreventthetrimmer line from contact-

ing any object. Hold the tool with your hand. Do not use

the optional shoulder strap for support.

AW_G

Keep others away when making carburetor

adjustments.

Aw asm

Serious injury to the operator and others can occur if the

carburetor is not properly adjusted.

• The carburetor has been carefully adjusted at the

• factory. However, the operator must be sure that

adjustments are made when any of the following

conditions occur:

NOTE: Be sure to properly prepare the• toolas

deseribedin "1. Preparation" before making any adjust-

• ments.

-- Engine will not continue to run at idle position.

See "2. idle Speed Adjustment" and "5. Lmv

Speed Mixture Adjustment."

-- Trimmer Head continpes to spin when the engine

idles. See "2. Idle Speed Adjustment" and "4.

Deceleration Check"

-- Engine dies or hesitates when it should accelerate.

See "3. Acceleration Check"

-- Loss of cutting power which cannot be corrected by

cleaning the air filter. See "tt I_gh Speed Mixture

Adjustment"

-- Engine does not return to idle from full throttle

• within 2 s_onds. See'_4. Deceleration Check"

--Engine will not run. See "Troubling Shooting

Chart" Then, if the carburetor requires adjust-

ment, begin with "7. Basic Carburetor Settings"

• This is a complicated task and it is important to

follow instructions in sequence as indicated.

• Very Small adjustments can affect engine perfor-

mance. It is important to turn the screw a very small

amount per adjustment and test performance before

making further adjustments. Each adjustment should

be no more than the width of the slot in the adjusting

screw.

_k WAdtt_G

The trimmer line will be spinning during most of this

procedm_ Wear your protective equipment ando_e

all safety instructions.

1. PREPARA'I_ON

a. Use a fresh fuel mix. See "Fueling Your Engine"

b. Make sure the line extends to the length allowed by

the line limiter to provide correct load on engine.

C-

Start the engine. Cut grass for 3 minutes to warm

en(me. 7he engine must be at operan'ng temperature

before carburetor adjustments can be performed

correcll_

Stopengineand removeairfilterby pulling itoutwith

your fingers. Refer to "Specifications" for location.

2. IDLE SPEED ADJUSTMENT

Allow engine to idle.

Adjust Idle SpeedScrew (Figure 25) until the engine

continues to run without stalling and without the

trimmer headmoving.

-- Turn screw clockwise _ to increase engine

speed if the engine stalls or dies.

-- Turn screw counterclockwise &-_ to slow

engine down andiorto keep the trbnmer linefrom

turning.

c. Follow instructions in "3. Acceleration Check" and

'_,. Deceleration Check."

d. No further adjustments are necessary ifthetrim-

mer head does not turn at idle speed and if per-

formance is satisfactory.

_WARNING

Recheck idle speed after each adjustment. The trimmer

head must not turn at idle speed to avoid serious injury

to the operator and others.

3.ACCELERATION CHECK

a. Allow engine to idle.

b. Squeeze Trigger fuliy.

1.) Ifperformance is satisfactory, proceed to '4.

Deceleration Check"

2.) If the engine does not accelerate smoothly, turn

the Low Speed Mixture Screw (Figure 25)

counterclockwise _,_ a small amount (no

more than the width of the slot in the adjusting

screw).

c. P-_eat step "'b." until smooth acceleration is

obtained.

NOTE: It may be necessary to repeat "2. Idle Speed

Adjustment" through "3. Acceleration Check" to

• obtain correct adjustments.

d. Follow instructions in "4. Deceleration Check"

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Craftsman 358.798141-28.0cc Operator's Manual Page 16

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