Spark Plug - Stihl GS 461 Instruction Manual

English
15.3 Adjusting Idle Speed
Before starting, open the shut-off cock fully so
that water flows to the diamond abrasive chain –
never allow chain to run dry.
► Carry out the standard setting.
► Start and warm up the engine.
15.3.1 Engine stops while idling or chain runs
while engine is idling
► Turn the idle speed screw (LA) clockwise as
far as stop or until the chain begins to run –
then turn the screw back 1 1/2 turns.
WARNING
If the chain continues moving when the engine is
idling, have your machine checked and repaired
by your servicing dealer.
15.3.2 Erratic idling behavior, poor accelera‐
tion (even though low speed screw is
open 1/4 turn)
Idle setting is too lean
► Turn the low speed screw (L) counterclock‐
wise until the engine runs and accelerates
smoothly.
It is usually necessary to change the setting of
the idle speed screw (LA) after every correction
to the low speed screw (L).
20
15.4 Fine Tuning for Operation at
High Altitude
A slight correction of the setting may be neces‐
sary if engine does not run satisfactorily:
► Carry out the standard setting.
► Warm up the engine.
► Turn high speed screw (H) slightly clockwise
(leaner) – no further than stop.
NOTICE
After returning from high altitude, reset the car‐
buretor to the standard setting.
If the setting is too lean there is a risk of engine
damage due to insufficient lubrication and over‐
heating.

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► If the engine is down on power, difficult to start
or runs poorly at idle speed, first check the
spark plug.
► 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 "Specifica‐
tions".
16.1 Remove the spark plug
► Remove coarse dirt from the machine
► Turn screw plug above the rear handle in the
direction of the arrow and remove filter cover –
screw plug is secured in the filter cover
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0458-761-0121-B