Spark Plug - Stihl KM 56 R Manual De Instrucciones

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
Shut off the engine
N
The spark plug boot (2) sits inside the
cap (1).
The cap (1) protects the spark plug boot
from damage. Do not operate the
machine without a cap – replace a
damaged cap.
Pull off the spark plug boot (2)
N
together with the cap (1).
Unscrew the spark plug (3).
N
KM 56 R, KM 56 RC
If the cap becomes detached while
pulling off the spark plug boot, see
"Installing the Spark Plug".
Checking the Spark Plug
Clean dirty spark plug.
N
Check electrode gap (A) and
N
readjust if necessary – see
"Specifications".
Use only resistor type spark plugs of
N
the approved range.
Rectify problems which have caused
1
fouling of spark plug:
Too much oil in fuel mix.
–
Dirty air filter.
–
Unfavorable running conditions,
–
e.g. operating at part load.
A
Warning!
To reduce the risk of fire and burn injury,
use only spark plugs authorized by
STIHL. Always press spark plug boot (1)
snugly onto spark plug terminal (2) of
the proper size. (Note: If terminal has
detachable SAE adapter nut, it must be
attached.) A loose connection between
spark plug boot and ignition wire con-
nector in the boot may create arcing that
could ignite combustible fumes and
cause a fire.
Installing the Spark Plug
Screw the spark plug into the
N
cylinder.
Press the spark plug boot with cap
N
firmly on to the spark plug.
If the cap has become detached from
the spark plug boot:
English
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