![background image](http://html1.mh-extra.com/html/stihl/sp-81/sp-81_instruction-manual_1379380024.webp)
23
SP 81
English
Erratic idling behavior, engine stops
even though setting of LA screw is
correct, poor acceleration
Idle setting too lean:
:
Turn low speed screw
(
L
)
counterclockwise (about 1/4 turn)
until the engine runs and
accelerates smoothly.
Erratic idling behavior
Idle setting too rich:
:
Turn low speed screw (
L
) clockwise
(about 1/4 turn) until the engine runs
and accelerates smoothly.
If the engine is low on power, check the
spark arresting screen in the muffler.
:
Lift spark arresting screen and pull it
out sideways.
:
Clean spark arresting screen if
necessary.
:
If screen is damaged or coked up, fit
a new one.
:
Refit the spark arresting screen.
*
see “Guide to Using this Manual”
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".
Spark Arresting Screen* in
Muffler
392BA035 KN
Checking the Spark Plug
000BA002 KN