Spark Plug; Storing The Machine - Stihl MS 720 Instruction Manual

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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
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operating hours – or sooner if the
electrodes are badly eroded. Install
only suppressed spark plugs of the
type approved by STIHL – see
"Specifications".
Checking the Spark Plug
Clean dirty spark plug.
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Check electrode gap (A) and
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readjust if necessary – see
"Specifications".
Rectify the problems which have
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caused fouling of the spark plug.
Possible causes are:
Too much oil in fuel mix.
–
Dirty air filter.
–
Unfavorable running conditions.
–
30
WARNING
Arcing may occur if the adapter nut (1) is
loose or missing. Working in an easily
combustible or explosive atmosphere
may cause a fire or an explosion. This
can result result in serious injuries or
damage to property.
Use resistor type spark plugs with a
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properly tightened adapter nut.
A

Storing the Machine

1
For periods of 3 months or longer
Drain and clean the fuel tank in a
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well ventilated area.
Dispose of fuel properly in
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accordance with local
environmental requirements.
Run the engine until the carburetor
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is dry – this helps prevent the
carburetor diaphragms sticking
together.
Remove the saw chain and guide
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bar, clean them and spray with
corrosion inhibiting oil.
Thoroughly clean the machine – pay
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special attention to the cylinder fins
and air filter.
If you use a biological chain and bar
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lubricant, e.g. STIHL BioPlus,
completely fill the chain oil tank.
Store the machine in a dry, high or
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locked location, out of the reach of
children and other unauthorized
persons.
MS 720