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

Engine Management

Exhaust emissions are controlled by the
design of the fundamental engine
parameters and components (e.g.
carburation, ignition, timing and valve or
port timing) without the addition of any
major hardware.
KM 94 R

Adjusting the Carburetor

The carburetor has been set at the
factory to provide an optimum fuel-air
mixture under most operating
conditions.
Adjusting idle speed
Engine stops while idling
Turn the idle speed screw (LA)
N
slowly clockwise until the engine
runs smoothly – the attachment
must not run.
Attachment runs when engine is idling
Turn the idle speed screw (LA)
N
slowly counterclockwise until the
attachment stops running.
WARNING
If the attachment continues to run when
the engine is idling, have your machine
checked and repaired by your servicing
dealer.

Spark Plug

If engine is down on power, difficult to
start or runs poorly at idling speed, first
check the spark plug.
Fit a new spark plug after approx. 100
operating hours or earlier if the
electrodes are badly eroded.
Wrong fuel mix (too much engine oil in
the gasoline), a dirty air filter and
unfavorable running conditions (mostly
at part throttle etc.) affect the condition
of the spark plug. These factors cause
deposits to form on the insulator nose
which may result in trouble in operation.
Removing the spark plug
2
1
Turn screw (1) in cap (2) until cap
N
can be removed
Lay down cap
N
English
17