MAINTENANCE
Engine
Clean the cylinder fins with compressed air or a brush
periodically (Fig. 75). Dangerous overheating of engine may occur
due to impurities on the cylinder.
WARNING: Never run the machine without all the
parts, including the starting housing, securely in
place.
Because parts can fracture and pose a danger of
thrown objects, leave repairs to the flywheel and
clutch to trained Servicing Dealers.
Spark Plug
This engine uses a NGK BPMR7A with .02” (0.5 mm) electrode gap
(Fig. 76). Use an exact replacement and replace every six
months or more frequently, if necessary.
WARNING: Never test the ignition system with
ignition wire connector removed from spark plug or
with unseated spark plug, since uncontained
sparking may cause a fire. A loose connection
between spark plug terminal and ignition wire
connector in the boot may create arcing that could
ignite combustible fumes and cause a fire.
Use only resistor type spark plugs of the approved range.
Factors such as:
- too much oil in fuel mix;
- dirty air filter;
- unfavourable running conditions, e.g. operating at part load;
may result in rapid deterioration of the spark plug.
Spark Arresting Muffler
The brush cutter is provided with a Spark Arrester System p.n.
61110123 (Fig. 77) complying with the requirements of SAE J335
standard; you can check the p.n. of the Spark Arrester System on
the muffler itself.
WARNING: A faulty or altered spark arrester system
screen can create a fire hazard.
Through normal use the screen can become dirty and should be
inspected weekly and cleaned as required.
To clean:
• Allow the muffler to cool.
• Remove the two (2) deflector screws (A).
• Remove the deflector (B, Fig. 78) and spark arrester (C).
• Clean and inspect the spark arrester screen. If the spark
arrester screen is damaged, faulty or deteriorated, replace the
screen.
• Reassemble components in reversed order of removal and
torque the screw to 45 in/lbs (4.9 Nm).
WARNING: If the spark arrester screen is damaged,
faulty or deteriorated, replace the screen or entire
muffler assembly.
75
76
77
29
en
78
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