McCulloch 966625301 Helpful Tip, Fuel System, Engine, Other, Troubleshooting Table, Cause, Remedy

Models: 115377027 MC4218AV 966625301

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FUEL SYSTEM

FUEL SYSTEM

Under FUELING ENGINE in the OPERA- TION section of this manual, see message labeled IMPORTANT regarding the use of gasohol in your chain saw. Fuel stabilizer is an acceptable alternative in minimizing the formation of fuel gum deposits during stor- age. Add stabilizer to the gasoline in the fuel tank or fuel storage container. Follow the mix instructions found on stabilizer containers. Run engine at least 5 minutes after adding stabilizer.

HELPFUL TIP

During storage of your gas/ oil mixture, the oil will sepa- rate from the gas.

We recommend that you shake the gas can weekly to insure proper blending of the gas and oil.

ENGINE

SRemove spark plug and pour 1 teaspoon of 40:1, 2-cycle engine oil (air cooled) through the spark plug opening. Slowly pull the starter rope 8 to 10 times to distrib- ute oil.

SReplace spark plug with new one of rec- ommended type and heat range.

SClean air filter.

SCheck entire unit for loose screws, nuts, and bolts. Replace any damaged, broken,

or worn parts.

SAt the beginning of the next season, use only fresh fuel having the proper gasoline to oil ratio.

OTHER

SDo not store gasoline from one season to

another.

S Replace your gasoline can if it starts to rust.

TROUBLESHOOTING TABLE

WARNING: Always stop unit and disconnect spark plug before performing all of the recommended remedies below except remedies that require operation of the unit.

TROUBLE

CAUSE

REMEDY

 

 

 

 

 

Engine will not

1. Ignition switch off.

1.

Move ignition switch to ON.

start or will run

2. Engine flooded.

2.

See “Difficult Starting” in

only a few

 

 

 

Operation Section.

seconds after

3. Fuel tank empty.

3.

Fill tank with correct fuel mixture.

starting.

4. Spark plug not firing.

4.

Install new spark plug.

 

5. Fuel not reaching

5.

Check for dirty fuel filter; replace.

 

 

carburetor.

 

Check for kinked or split fuel line;

 

 

 

 

repair or replace.

 

 

 

 

 

Engine will

1.

Idle speed requires

1. See “Carburetor Adjustment” in the

not idle

 

adjustment.

 

Service and Adjustments Section.

properly.

2.

Carburetor requires

2. Contact an authorized service dealer.

 

 

adjustment.

 

 

 

Engine will not

1.

Air filter dirty.

1. Clean or replace air filter.

accelerate,

2.

Spark plug fouled.

2. Clean or replace plug and regap.

lacks power,

3.

Chain brake engaged.

3. Disengage chain brake.

or dies under

4.

Carburetor requires

4. Contact an authorized service dealer.

a load.

 

adjustment.

 

 

 

Engine

1.

Too much oil mixed with

1.

Empty fuel tank and refill with

 

smokes

 

gasoline.

 

correct fuel mixture.

excessively.

 

 

 

 

 

Chain moves

1. Idle speed requires

1. See “Carburetor Adjustment” in the

at idle speed.

 

adjustment.

 

Service and Adjustments Section.

 

2. Clutch requires repair.

2.

Contact an authorized service dealer.

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McCulloch 966625301, MC4218AV, 115377027 Helpful Tip, Fuel System, Engine, Other, Troubleshooting Table, Cause, Remedy