Engine Management; Adjusting The Carburetor; Spark Plug - Stihl FS 94 R Instruction Manual

English

Engine Management

Exhaust emissions are controlled by the
design of the engine and components
(e.g. carburation, ignition, timing and
valve or port timing).
26

Adjusting the Carburetor

The carburetor of the machine has been
adjusted for optimum performance and
fuel efficiency in all operating states at
the factory.
Setting the idle speed
Engine stops when idling
Turn the idle speed screw (LA)
N
slowly clockwise until the engine
runs smoothly.
Cutting attachment turns when idling
Turn the idle speed adjusting
N
screw (LA) slowly counterclockwise
until the cutting attachment stops
turning
WARNING
If the cutting attachment continues to
keep rotating in idle even after
adjustment, have the unit checked by a
servicing dealer.

Spark Plug

If the engine is down on power,
N
difficult to start or runs poorly at idle
speed, first check the spark plug.
Fit a new spark plug after about 100
N
operating hours – or sooner if the
electrodes are badly eroded. Install
only suppressed spark plugs of the
type approved by STIHL – see
"Specifications".
Removing the spark plug
2
1
Turn screw (1) in cap (2) until cap
N
can be removed
Lay down cap
N
3
Pull off the spark plug boot (3)
N
Unscrew spark plug,
N
FS 94 R