McCulloch MAC BP290 Trouble Shooting the Engine, Storage, Carburetor Adjustment, Spark Plug

GB

GB

•FUEL CAP / FUEL FILTER

• SPARK ARRESTOR SCREEN / COLLAR

ASSEMBLY

TROUBLE SHOOTING THE ENGINE

CAUTION: Remove fuel from unit and store in approved container before starting this procedure. Open fuel cap slowly to release any pressure which may have formed in fuel tank.

NOTE: Keep vent (A) on fuel cap clean of debris (Fig. 22).

Fuel Filter:

1.Completely remove fuel cap from fuel tank (B) to be able to remove fuel filter (C) from tank. Use a piece of wire (C) with a hook formed at the end to pull filter out of tank. (Fig. 23)

2.Pull off fuel filter (D) with a twisting motion.(Fig. 24).

3.Replace fuel filter.(Fig. 24).

NOTE: Never operate the blower without the fuel filter. Internal engine damage could result!

A

C

B

Fig. 22 Fig. 23

1.To replace spark arrestor screen/collar assembly (A)

(Fig. 26), use a needle nose pliers and pinch an edge of the collar. Pull out the whole spark arrestor screen assembly.

2.Use the needle nose pliers to push in a new spark arrestor screen assembly by opening the pliers slightly to press the inner surface of the assembly securely into place

•STORAGE

WARNING: Failure to follow these steps may cause varnish to form in the carburetor and difficult starting or permanent damage follow- ing storage.

1.	Perform all the general maintenance recommended
	in the Maintenance Section of your User Manual.
2.	Clean outside surface of unit.
3.	Drain fuel from the fuel tank.
4.	After fuel is drained, start engine.
5.	Run engine at idle until unit stops. This will purge
	the carburetor of fuel.
6.	Allow engine to cool (approx. 5 minutes).
7.	Using a spark plug wrench, remove the spark plug.
8.	Pour 1 teaspoon of clean 2 stroke engine oil into the
	combustion chamber. Pull starter rope slowly
	several times to coat internal components. Replace

PROBLEM

Unit won’t start or starts but will not run.

Unit starts, but engine has low power.

Engine hesitates.

No power under load.

PROBABLE CAUSE

Incorrect starting procedures.

Incorrect carburetor mixture adjustment setting.

Fouled spark plug.

Empty fuel tank.

Primer bulb was not pressed enough.

Fuel filter is plugged.

Incorrect lever position.

Dirty spark arrestor screen.

Dirty air filter.

Incorrect carburetor mixture adjustment setting service dealer.

Incorrect carburetor mixture adjustment setting.

Air filter is plugged.

Old or improperly mixed fuel.

Incorrect carburetor mixture adjustment setting.

Old or improperly mixed fuel.

Air filter is plugged.

CORRECTIVE ACTION

Follow instructions in the User Manual.

Have carburetor adjusted by an Authorized Service Center.

Clean/gap or replace plug.

Fill fuel tank with properly mixed fuel.

Press primer bulb fully and slowly 10 times.

Replace the fuel filter.

Move to RUN position.

Replace spark arrestor screen.

Remove, clean and reinstall filter.

Have carburetor adjusted by an Authorized Service Center.

Have carburetor adjusted by an Authorized Service Center.

Replace or clean the air filter.

Drain fuel tank/add fresh fuel mixture.

Have carburetor adjusted by an Authorized Service Center.

Drain fuel tank (see storage)/add fresh fuel mixture.

•CARBURETOR ADJUSTMENT

The carburetor was pre-set at the factory for optimum performance. If further adjustments are necessary take your blower to a qualified service dealer.

•SPARK PLUG

C

Fig. 24

spark plug.

9. Store unit in a cool, dry place away from any source

of ignition such as an oil burner, water heater, etc.

•REMOVING A UNIT FROM STORAGE

1.	Remove spark plug.
2.	Pull starter rope briskly to clear excess oil from
	combustion chamber.
3.	Clean spark plug or install a new spark plug with
	proper gap.(Fig. 25)
4.	Prepare unit for operation.

Runs erratically.

Smokes excessively.

Fouled spark plug.

Incorrectly gapped spark plug.

Plugged spark arrestor.

Dirty air filter.

Incorrect carburetor mixture adjustment setting.

Incorrect fuel mixture.

Replace or clean the air filter.

Replace or clean the spark plug.

Clean/gap or replace plug.

Clean or replace spark arrestor.

Clean or replace air filter.

Have carburetor adjusted by an Authorized Service Center.

Use properly mixed fuel(40:1 mixture).

1.To remove spark plug (B) (Fig. 26) for cleaning or replacement: make sure engine is off, spark plug is cool, then grasp spark plug boot firmly and remove from spark plug. Remove spark plug with correct spark plug tool. Inspect, clean or replace as needed.

2.Spark plug gap = .025 in. (.635mm) (Fig. 25).

3.Torque to 105 to 130 inch pounds (12 to 15 N•m). Connect spark plug boot.

4.If need replace spark plug with Champion RZ7C or equivalent.

5. Fill fuel tank with proper fuel / oil mixture. See Fuel

and Lubrication Section.

.025” (.635mm)

Spark

Plug

Fig. 25

B

A

Fig. 26

7

8