Stihl MS 661 Manual page 41

Models without M-Tronic
(ignition module)
2
2 4
: Pull the short circuit wire (1) out
of the guide and disconnect the
terminal.
: Take out the screws (2), pull the
ignition lead (3) out of the guide
and remove the ignition
module (4).
Models with M-Tronic
(control unit)
3 4 1
: Lift locking tab (arrow) and pull
off the flag terminal (1).
: Take out the screws (3), pull the
ignition lead (2) out of the guide
and remove the control unit (4).
All versions
A new ignition module / control unit
is supplied with cover, grommet,
ignition lead and spark plug boot.
40
– Check the spark plug boot and
ignition lead, and replace if
necessary, b 7.6
3
Installing
– Install the ignition lead if
1
necessary, b 7.6
2 1
: Fit the ignition module / control
unit (1) and insert the screws (2)
– do not tighten down yet.
2
3
1
: Push the ignition module / control
unit back and slide the setting
gauge (1) 1111 890 6400
between the arms of the ignition
module and the flywheel magnet.
The setting gauge is not shown in
2
the illustration.
: Push the ignition module / control
unit (1) back and hold it there.
– The flywheel must turn freely.
: Rotate the flywheel until the N / S
magnet poles (arrows) are next to
the ignition module / control unit
(1).
– Setting gauge remains in place
during this process.
: Press the ignition module /
control unit (1) against the setting
gauge and hold it there.
: Tighten down the screws (1)
firmly and remove the setting
gauge.
– Check operation
– Rotate the flywheel and make
sure it does not touch the ignition
module / control unit.
1
1
1
MS 661, MS 661 C-M