Spark Arresting Screen In Muffler; Spark Plug - Stihl MS 650 Instruction Manual

English
Spark Arresting Screen in
Muffler
In some countries, the muffler is fitted
with a spark arresting screen.
If engine performance deteriorates,
N
check the spark arresting screen in
the muffler
Let the muffler cool down
N
Version A
1
Remove four screws
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Remove exhaust casing (1) of the
N
muffler
3
2
Bend back the retaining lugs (2)
N
Pull out spark arresting screen (3)
N
34
Clean the dirty spark arresting
N
screen, replace if damaged or
heavily carbonized
Refit the spark arresting screen in
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reverse order of steps
Version B
In this version, the muffler is equipped
with two spark arresting screens.
Remove screw (1)
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Lift and pull out the spark arresting
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screen (2)
Clean the dirty spark arresting
N
screen, replace if damaged or
heavily carbonized
Refit the spark arresting screen in
N
reverse order of steps
Check second spark arresting
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screen – as with Version A

Spark Plug

If the engine is down on power,
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difficult to start or runs poorly at idle
speed, first check the spark plug.
Fit a new spark plug after about 100
N
operating hours – or sooner if the
electrodes are badly eroded. Install
only suppressed spark plugs of the
type approved by STIHL – see
"Specifications".
Remove the spark plug
1
Move the Master Control lever to the
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2
stop position 0
Turn the knob above the rear handle
N
in the direction of the arrow and
remove the carburetor box cover
MS 650, MS 660