Ignition System; Spark Plug Boot - Stihl 4180 Series Manual

8.

Ignition System

Exercise extreme caution while
carrying out maintenance and repair
work on the ignition system.
The high voltages which occur can
cause serious or fatal accidents.
Troubleshooting on the ignition
system should always begin at the
spark plug, b 4.3.
1
2
The electronic (breakerless) ignition
system basically consists of an
ignition module (1) and flywheel (2).
Series 4180 Powerhead
8.1

Spark Plug Boot

– Remove the shroud, b 5.7
The ignition lead is molded to the
ignition module.
: Use suitable pliers to pull the leg
spring out of the spark plug boot.
– Unhook the leg spring from the
ignition lead.
– Push the spark plug boot back a
little in the direction of the ignition
module.
– Cut about 10 mm off the end of
the ignition lead.
– Coat end of ignition lead with oil.
: Pinch the hook of the leg spring
into the center of the lead, i.e.
about 15 mm from the end of the
lead.
: Pull the lead back into the boot so
that the leg spring locates
properly inside it.
Reassemble in the reverse
sequence.
: Check if spark plug has a
detachable adapter nut (arrow). If
so, make sure it is properly fitted
and firmly tightened.
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