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Maintenance
Replacing the air filter
If the engine seems to lack power or does not run smoothly
this may be because the air filter is clogged. It is therefore
important to replace the air filter at regular intervals (see
Maintenance/Maintenance Schedule for the correct service
interval).
Replace the air filter as follows:
1 Open the engine cover.
2 Loosen the knobs holding the filter cover in place and
remove it.
3 Pull up the filter at one edge and lift it out.
4 Remove the foam rubber prefilter which is placed around
the filter cartridge and clean using a mild detergent.
Squeeze it dry in a clean cloth.
Clean the filter by knocking it with care against a hard
surface. Do not use compressed air to clean the filter.
Replace the air filter if it is still dirty. If the paper filter is still
dirty it should be replaced with a new one.
Refit the pre-filter on the paper filter.
5 Put the filter cartridge back in place. Make sure the filter
cartridge is correctly fitted in the filter housing.
6 Refit the air filter cover.
Ignition system
The engine is equipped with an electronic ignition system.
Only the spark plug requires maintenance.
For recommended spark plug, see Technical data.
Replacing the spark plug
1 Remove the ignition cable shoe and clean around the
spark plug.
2 Remove the spark plug with a 3/4” (19 mm) spark plug
socket wrench.
3 Check the spark plug. Replace the spark plug if the
electrodes are burned or if the insulation is cracked or
damaged. Clean the spark plug with a steel brush if it is to
be reused.
4 Measure the electrode gap with a gapping tool. The gap
should be 0.75 mm/0.030”. Adjust as necessary by
bending the side electrode.
5 Reinsert the spark plug, turning by hand to avoid
damaging the threads.
6 Tighten the spark plug, once it touches the seating, with
the spark plug spanner. Tighten the spark plug so that the
washer is compressed. A used spark plug should be
turned 1/8 of a turn from the seated position. A new spark
plug should be turned a 1/4 turn from the seated position.
7 Replace the ignition cable shoe.
Cleaning the engine and muffler
Keep the engine and muffler free from grass cuttings and dirt.
Grass cuttings steeped in petrol or oil on the engine can
increase the fire risk and impair cooling.
Allow the engine to cool before cleaning. If the dirt is mixed
with oil, remove it using a degreasing agent otherwise just
water and a brush.
Grass cuttings around the muffler dry quickly and constitute a
fire risk. Brush or wash them off when the muffler is cold.
!
WARNING! The exhaust system is hot. Let it
cool before starting to replace the air filter.
IMPORTANT INFORMATION
Never run the engine without the air filter fitted.
The filters must not be oiled. They must be fitted dry.
IMPORTANT INFORMATION
Fitting the wrong spark plug type can damage the engine.
IMPORTANT INFORMATION
Inadequately tightened spark plugs can cause overheating
and damage the engine. Tightening the spark plug too
much can damage the threads in the cylinder head.