Engine Running Behavior - Stihl MM 56 Instruction Manual

English
Checking the Spark Plug
Clean dirty spark plug.
N
Check electrode gap (A) and
N
readjust if necessary – see
"Specifications".
Rectify the problems which have
N
caused fouling of the spark plug.
Possible causes are:
Too much oil in fuel mix.
–
Dirty air filter.
–
Unfavorable running conditions.
–
WARNING
Arcing may occur if the adapter nut (1) is
loose or missing. Working in an easily
combustible or explosive atmosphere
may cause a fire or an explosion. This
can result result in serious injuries or
damage to property.
16
Use resistor type spark plugs with a
N
properly tightened adapter nut.
Installing the spark plug
Screw the spark plug into the
N
cylinder.
Press the boot firmly onto the spark
N
plug.
A
Push the cap (1) on to the spark
N
plug boot as far as stop.
1

Engine Running Behavior

If engine running behavior is
unsatisfactory even though the air filter
is clean and the carburetor is properly
adjusted, the cause may be the muffler.
Have the muffler checked for
contamination (carbonization) by your
servicing dealer.
STIHL recommends that you have
servicing and repair work carried out
1
exclusively by an authorized STIHL
servicing dealer.
MM 56 C