Manual McCulloch M4218 (page 14 of 17) (English, German, French, Portuguese, Spanish)

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Replace guide bar w hen the groove is worn,

the guide bar is bent or cracked, or when

excess heatingorburring of the rails occurs.

If replacement is necessary, use on ly theguide

bar specified for your s aw in the repair parts list

or on the decal located on the chain saw .

SPARK PLUG

The spark plug should be replaced each

year to ensure the engine starts easier and

runs better. Ignition timing is fixed and non-

adjustable.

1. Loosen 3 screws on cylinder cover.

2. Remove the cylinder cover.

3. Pull of f the spark plug boot.

4. Remove spark plug from cylinder and

discard.

5. Replace with Champion RCJ--7Y spark

plug and tighten securely with a 19 mm

socket wrench. Spark plug gap should be

0,5 mm.

6. Reinstall t he spark plug boot .

7. Reinstall the cylinder cover and 3

screws. Tighten securely.

Cylinder

Cover

Cylinder Co

Scre ws

Spark

Plug

Spark Plug Boot

CHAIN SHARPENING

Chain sharpening is a complicated task that

requires special tools. We recommend that

you refer chain sharpening to a professional

chain sharpener.

CARBURETOR ADJUSTMENTS

WARNING: The chain will be moving

during most of this procedure. W ear your pro-

tective equipment and observe all safety pre-

cautions. The chain must not move at idle

speed.

The carburetor has been carefully set at the

factory. Adjustments may be necessary if

you notice any of the following conditions:

S Chain moves at idle. S ee IDLE SPEED--T

adjusting procedure.

S Saw will not idle. See IDLE SPEED--T ad-

justing procedure.

Idle Speed---T

Allow engine to idle. If the chain moves, idle

is toofast. If theenginestalls, idleis tooslow.

Adjust speed until engine runs without chain

movement (idle too f ast) or stalling (idle too

slow). The idle speedscrew islocated in the

area above the primer bulb and is labeled T.

S T urn idle speed screw (T) c lockwise to in-

crease engine speed.

S T urn idle speed screw (T) counterclock-

wise to decrease engine speed.

STORAGE

WARNING:Stop engine and allow to

cool, and secure the unit before storing or

transporting in a vehicle. Store unit and fuel

in an area where fuel vapors cannot reach

sparks or open flames from water heaters,

electric motors or switches, furnaces, etc.

Store unitwithall guards inplace.Positionso

that any sharp object cannot accidentally

cause injury to passersby. Store the unit out

of reach of children.

S Before storing, drain all fuel from the unit.

Start engine and allow to run until it stops.

S Clean the unit befor e storing. Pay particu-

lar attention to the airintake area, keeping

it free of debris. Use a mild detergent and

sponge to clean the plastic surfaces.

S Donotstoretheunit or fuelina closed area

where fuel vapors can rea ch sparks or an

openflamefrom hotwater heaters,electric

motors or switches, furnaces, etc.

S Store in a dry area out of the reach of chil-

dren.

S Ensure the machine i s cleaned and that a

complete service is carried out before

long--term storage.

S The guide bar and chain must always be

covered with a scabbard when t he machine

is being transported or in storage in order to

prevent accident contact with t he sharp

chain. Even a non--moving c hain can cause

serious cuts to yourself or persons you

bump into with an exposed chain.

CAUTION: It is important to prevent

gum deposits from forming in essential fuel

system par ts such as the carburetor , fuel fil-

ter, fuel hose, or fuel tank during storage. Al-

cohol blended fuels (called gasohol orusing

ethanol or methanol) can attract moisture

which leads to fuel mixture separation and

formation of acids during storage. Acidic gas

can damage the engine.

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McCulloch M4218 Manual

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