STIHL TS 460 44
6.1.2.1 Ignition Timing
6.1.2 Ignition Module
6.1.2.2 Removing and Installing
1 = High voltage output
2 = Connector tag
Ignition timing on the electronic
(breakerless) magneto ignition
system is fixed at 3.0 mm B.T.D.C.
at 8,000 r.p.m. and is not
adjustable. However, in view of the
permissible tolerances in the
electronic circuit, it may vary
between 2.8 and 3.2 mm B.T.D.C.
at 8,000 r.p.m.
Since there is no mechanical wear
in these systems, ignition timing
cannot get out of adjustment.
However, an internal fault in the
circuit can alter the switching point
in such a way that a spark test will
still show the system to be in order
although timing is outside the
permissible tolerance. This will
impair engine starting and running
behavior.
Top:
1 = Short circuit wire
1 = Wire retainer
Bottom:
Ignition module mounting screws
The ignition module accomodates
all the components required to
control ignition timing. There are
two electrical connections on the
coil body:
1. the high voltage output
2. the connector tag for the short
circuit wire
Accurate testing of the ignition
module is only possible with
sophisticated test equipment. For
this reason it is only necessary to
carry out a spark test in the
workshop. A new ignition module
must be installed if no ignition
spark is obtained (after checking
that wiring and stop switch are in
good condition).
- Remove the fan cover, see 6.1.5.
- Pull the short circuit wire off the
ignition module and out of the
retainer.
- Remove the ignition module
mounting screws.
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