Stihl FC 56 C User Manual

FC 56 C
English
23
Cutting blade rotates when engine is
idling
N Turn the idle speed screw (LA)
counterclockwise until the blade
stops moving and then turn the
screw another full turn in the same
direction.
Erratic idling behavior, engine stops
even though setting of LA screw has
been corrected, poor acceleration
Idle setting is too lean
N Turn the low speed screw (L)
counterclockwise, no further than
stop, until the engine runs and
accelerates smoothly.
Erratic idling behavior, engine speed
drops when swinging the machine
Idle setting is too rich
N Turn the low speed screw (L)
clockwise (1/8 of a turn or 45° at a
time) until the engine runs smoothly
and accelerates well.
It is usually necessary to change the
setting of the idle speed screw (LA) after
corrections to the low speed screw (L).
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
N Shut off the engine
The spark plug boot (2) sits inside the
cap (1).
N Pull off the spark plug boot (2)
together with the cap (1).
N Unscrew the spark plug (3).
If the cap becomes detached while
pulling off the spark plug boot, see
"Installing the Spark Plug".
Checking the Spark Plug
N Clean dirty spark plug.
N Check electrode gap (A) and
readjust if necessary – see
"Specifications".
N Use only resistor type spark plugs of
the approved range.
Rectify problems which have caused
fouling of spark plug:
– Too much oil in fuel mix.
– Dirty air filter.
– Unfavorable running conditions,
e.g. operating at part load.
If the cutting blade continues to
rotate when the engine is idling,
have your machine checked and
repaired by your servicing dealer.
Spark Plug
The cap (1) protects the spark
plug boot from damage. Do not
operate the machine without a
cap – replace a damaged cap.
547BA028 KN
1
000BA039 KN
A

Stihl FC 56 C Specifications

General

Brand	Stihl
Model	FC 56 C
Category	Lawn Mower
Language	English