Ignition Module - Stihl 064 Service Manual

STIHL 064, 066
1 = Flywheel (064)
2 = Flywheel (066)
3 = Magnet poles
4 = Magnet poles
- Inspect the flywheel and magnet
poles for any signs of cracks or
other damage. Fit a new flywheel
if you find any damage.
To install the flywheel:
- Check that Woodruff key is cor-
rectly positioned.
Important: Clean the stub of the
crankshaft and the flywheel hub
bore with a suitable standard com-
mercial, solvent-based degreasant.
Fit the flywheel in place. On model
064 the position of the Woodruff
key differs by 40° for analog and
digital ignitions. Replacement fly-
wheels have two slots to take this
into account. If an analog ignition
module is fitted (Bosch), install the
flywheel in position "B". Use posi-
tion "P" for digital ignition modules
(Prüfrex).
Markings on flywheel
B = Analog ignition
P = Digital ignition
The flywheel of 064 saws from ma-
chine number X 22 179 109 has
only one key slot. This flywheel
may only be installed in machines
with digital ignition systems. Model
066 saws have been equipped
with digital ignition modules since
start of production and their fly-
wheels have only one key slot.
- Fit mounting nut and tighten
it down to a torque of 33 Nm
(24.3 Ibf.ft).
Assembly of the remaining parts is
now a reversal of the disassembly
sequence.
5.1.6

Ignition Module

1 = Connector tag for short
circuit wire
2 = High voltage output
3 = Connector tag for LED wire
(066 only)
The ignition module accommo-
dates all the components required
to control ignition timing. There are
either two or three electrical con-
nections on the coil body, i.e.:
1. Connector tag for short circuit
wire
2. High voltage output
3. Connector tag for LED wire
In the event of a fault in one of the
integrated elements, the ignition
module will malfunction and must
be replaced as a complete unit.
When using the spark test to
check installed digital ignition
modules with the spark plug un-
screwed, make sure that the star-
ter rope is pulled at a sufficiently
high speed. If there is no spark at
the plug when the starter is pulled,
repeat the test at a higher cranking
speed. If there is still no spark, re-
place the digital ignition module.
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