Checking The Spark Plug - Stihl BG 55 Instruction Manual

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Checking the Spark Plug

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".
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: 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.
1
On all spark plugs:
: Always press the boot (2) firmly on
to the spark plug (3).
BG 55, BG 65, BG 85, SH 55, SH 85
2
3