Craftsman 358.795020 Operator's Manual download pdf (Page 16)

CARBURETORADJUSTMENT

WARNING: The trimmer head or

blade will be spinning during most of this

procedure. Wear protective equipment

and observe all safety precautions. After

making mixture adjustments, recheck

idle speed.

Carburetor adjustment is critical and if

done improperly can permanently

damage the engine as well as the car-

buretor. If you require further assis-

tance or are unsure about performing

this procedure, call our customer as-

sistance help line at 1-800-235-5878.

Old fuel, a dirty air filter, a dirty fuel fil-

ter, or flooding may give the impres-

sion of an improperly adjusted carbu-

retor. Check these conditions before

adjusting the carburetor.

The carburetor has been carefully set

at the factory. Adjustments may be

necessary if you notice any of the fol-

lowing conditions:

• Engine will not idle. See "Idle Speed"

under adjusting procedure.

• Engine dies or hesitates instead of

accelerating. See "Acceleration

Check" under adjusting procedure.

• Loss of cutting power. See "Mixture

Adjustment" under adjusting

procedure.

There are three adjustment screws on

the carburetor. The low speed adjust-

ment screw is marked with the letter L,

and the high speed adjustment screw

is marked with the letter H. The third

screw is the idle adjustment screw.

L Screw

Idle Adjustment

CARBURETOR PRESETS

When making carburetor preset adjust-

ments, do not force plastic limiter caps

beyond stops or damage will occur.

If carburetor presets are not needed,

proceed to "Adjusting Procedure, Idle

Speed."

To adjust presets:

• Turn both mixture screws counter-

clockwise to the midpoint between

the limiter cap stops.

• Turn the idle speed screw clockwise

until it stops. Now turn counterclock-

wise 4-1/2 turns.

• Start motor, cut grass for 3 minutes,

and proceed to the adjustment sec-

tion. If engine does not start,

refer to troubleshooting chart or call

1-800-235-5878.

• If engine performance is acceptable

at the preset positions, no further ad-

justment is necessary.

ADJUSTING PROCEDURE

Idle Speed Adjustment

Allow engine to idle. Adjust speed until

engine runs without stalling.

• Allow engine to idle. Be sure trimmer

line is extended to the maximum

length allowed by the line limiter.

• Adjust idle speed screw until engine

continues to run without stalling.

• Turn the screw clockwise to in-

crease engine speed if the engine

stalls or dies.

• Turn screw counterclockwise to

slow engine down.

• Follow instructions in "Acceleration

Check."

• No further adjustments are necessary

if performance is satisfactory and trim-

mer head does not turn at idle speed.

Low Speed Adjustment "L"

When making carburetor adjustments,

do not force plastic limiter caps beyond

stops or damage will occur.

• Allow the engine to idle.

• Turn screw "L" slowly clockwise until

the speed begins to drop. Note the

position of the screw. Do not attempt

to adjust beyond the stops as dam-

age can occur.

• Slowly turn the screw counterclock-

wise until the speed increases and

then begins to drop.

• Adjust the screw to the midpoint be-

tween the two positions.

• Check the acceleration by following

the steps outlined under ACCELERA-

TION CHECK. The trimmer head must

not turn at idle speed.

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