Stihl TS 420 - 7.2.3 Pressure test

TS 410, TS 420
English
33
Checking the Spark Plug
N Clean dirty spark plug.
N Check electrode gap(A) and
readjust if necessary – see
"Specifications".
N Rectify the problems which have
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.
N Use resistor type spark plugs with a
properly tightened adapter nut.
Installing the spark plug
N Fit the spark plug by hand and
screw it in
N Tighten spark plug with combination
wrench
N Press the spark plug boot firmly
onto the spark plug
N Position the cap for the spark plug
boot and screw it down
N Undo the nuts(1)
N Turn the tensioning nut(2)
counterclockwise with the
combination wrench –
approx.1/4turn, as far as it will
go=0
N Pull the water hose out of the guide
in the V
-
belt guard
N Remove screw(3)
N Raise the V
-
belt guard(4) slightly
and pull it off to the front
N Remove the V
-
belt from the front
pulley
000BA039 KN
A
1
000BA045 KN
Replacing the V
-
belt
1
1
1
2
370BA037 KN
0
4
3
370BA061 KN