Tap paper filter (2) to dislodge dirt.
NOTICE
■ Using compressed air for cleaning can dam‐
age the paper filter.
► Do not use compressed air to clean the
paper filter.
NOTICE
■ Dust and dirt behind the paper filter may
result in damage to the engine.
► Clean the paper filter so no dust and dirt
are left behind it.
►
Assemble the air filter, 7.3.
7.5 Checking the Spark Plugs
► Place the STIHL machine on a level surface.
► Stop the engine and allow it to cool down.
NOTICE
■ The engine has two spark plugs. Both spark
plugs must be checked.
► Detach spark plug socket (1).
► If the area around spark plug (2) is dirty: clean
the area around spark plug (2) with a cloth.
► Unscrew spark plug (2).
► Clean spark plug (2) with a cloth.
► Measure electrode gap (A) using a feeler
gauge. Adjust if necessary: A = 0.8 mm.
►
Replace the spark plug, 9.2:
–
If spark plug (2) is corroded.
–
If the insulator exhibits cracks or damage.
► Screw in spark plug (2) firmly by hand.
► Tighten spark plug (2) using a spark plug
wrench.
–
Used spark plug: 1/8 to 1/4 turn.
–
New spark plug: 1/2 turn.
► Press on spark plug socket (1) firmly.
► Check the second spark plug in the same way.
7.6 Changing the Engine Oil using
the Oil Drain Tube
Warm engine oil drains quickly and completely.
► Allow the engine to warm up.
► Run the tank empty.
► Stop the engine.
► Place the STIHL machine on a level surface.
CAUTION
■ Danger of burns
► Do not touch hot engine parts.
►
Unscrew oil dipstick (1), 7.2.
► Unscrew screw plug (3) from oil drain tube (2)
using two spanners (A/F 19 and A/F 15).
► Remove screw plug (3) and seal ring (4).
► Discard seal ring (4).
► Allow all the engine oil to drain into a suitable
container.
► Fit new seal ring (4) onto screw plug (3).
► Install screw plug (3) in oil drain tube (2) and
tighten to 14 Nm.
►
Add fresh engine oil, 5.2.
►
Screw in oil dipstick (1), 7.2.
8 Specifications
8.1 Exhaust Emissions
The CO
2
value measured in the EU type appro‐
val procedure is specified at www.stihl.com/co2
in the product-specific technical data.
The measured CO
2
value was determined on a
representative engine in accordance with a
standardised test procedure under laboratory
conditions and does not represent either an
explicit or implied guarantee of the performance
of a specific engine.
8 Specifications English
0478-983-9915-B 13
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