20
English
BG 55, BG 65, BG 85, SH 55, SH 85
If engine is down on power, difficult to
start or runs poorly at idle speed, first
check the spark plug.
: Remove the spark plug –
see "Starting / Stopping the Engine".
: Clean dirty spark plug.
: Check electrode gap (A) and
readjust if necessary – see
"Specifications".
: Rectify the problems which have
caused fouling of spark plug:
– To much oil in fuel mix.
– Dirty air filter.
– Unfavorable running conditions.
: Fit a new spark plug after
about 100 operating hours – or
sooner if the electrodes are badly
eroded.
Install 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 (1), screw it
on firmly.
On all spark plugs:
: Always press the boot (2) firmly on
to the spark plug (3).
Checking the Spark Plug
000BA002 KN
1
000BA045 KN
3
000BA050 KN
2
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