Checking The Spark Plug - Stihl HS 86 Instruction Manual

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Checking the Spark Plug

If the engine is down on power, difficult
to start or runs poorly at idle speed, first
check the spark plug.
Removing the spark plug
N
Clean dirty spark plug.
N
Check electrode gap (A) and
N
readjust if necessary – see
"Specifications".
Rectify the problems which have
N
caused fouling of the spark plug.
Possible causes are:
Too much oil in fuel mix.
–
Dirty air filter.
–
Unfavorable running conditions.
–
Fit a new spark plug after about 100
N
operating hours – or sooner if the
electrodes are badly eroded. Install
16
only suppressed spark plugs of the
type approved by STIHL – see
"Specifications".
To reduce the risk of arcing and fire
If the spark plug comes with a
detachable adapter nut:
Screw the adapter nut (1) onto the
N
thread and tighten it down firmly.
On all spark plugs
1
Always press the boot (2) firmly on
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to the spark plug (3).
2
3
HS 86 R, HS 86 T