Spark Plug; Storage; Removing A Unit From Storage - McCulloch MB2500BP User Manual

8-5. SPARK PLUG

1. To remove spark plug (A) (Fig. 8-5A) 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" (.635mm) (Fig. 8-5B).
3. Torque to 120 inch pounds (12 to 15 N•m). Connect
spark plug boot.
4. If needed, replace spark plug with Champion RZ7C or
equivalent.
A
.025" (.635mm)
Spark
Plug
13
8 - MAINTENANCE INSTRUCTIONS
8-5A
8-5B

8-6. STORAGE

Failure to follow these steps may cause varnish to form in
the carburetor which can cause difficult starting or perma-
nent damage following storage.
1. Perform all the general maintenance recommended in
the Maintenance Section of your User Manual.
2. Clean exterior of engine and blower tubes.
3. Drain fuel from the fuel tank by running the unit dry or
by removing the fuel cap and tipping the motor hous-
ing/fuel tank over and draining oil/fuel mixture into a
container with the same 2-cycle fuel mixture.
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-cycle 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.

8-7. REMOVING A UNIT FROM STORAGE

1. Remove spark plug.
2. Pull starter rope briskly to clear excess oil from com-
bustion chamber.
3. Clean and gap spark plug or install a new spark plug
with proper gap. (Fig. 8-5B)
4. Prepare unit for operation.
5. Fill fuel tank with proper fuel / oil mixture. See Fuel and
Lubrication Section.