McCulloch MAC BP290 - Manual (Page 4)

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• FUEL CAP / FUEL FILTER
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!
• 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
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.
• SPARK ARRESTOR SCREEN / COLLAR
ASSEMBLY
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
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
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.
5. Fill fuel tank with proper fuel / oil mixture. See Fuel
and Lubrication Section.
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.
WARNING: Failure to follow these steps may
cause varnish to form in the carburetor and
difficult starting or permanent damage follow-
ing storage.
PROBLEM
Unit won’t start or starts but will not run.
Unit starts, but engine has low power.
Engine hesitates.
No power under load.
Runs erratically.
Smokes excessively.
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.
Fouled spark plug.
Incorrectly gapped spark plug.
Plugged spark arrestor.
Dirty air filter.
Incorrect carburetor mixture adjustment
setting.
Incorrect fuel mixture.
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.
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).
TROUBLE SHOOTING THE ENGINE
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Fig. 25 Fig. 26
B
.025” (.635mm)
A
Spark
Plug
Fig. 22 Fig. 23
A
B
C
Fig. 24
C
GB GB