Spark Arresting Screen In Muffler; Checking The Spark Plug - Stihl SP 81 Instruction Manual

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.
SP 81
Spark Arresting Screen* in
Muffler
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"

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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