Stihl MS 661 C-M

41MS 661, MS 661 C-M
Models without M-Tronic
(ignition module)
: Connect terminal of short circuit
wire (1) with its crimped side
facing outwards.
: Push the short circuit wire (1)
fully into the guide (arrow).
Models with M-Tronic (control
unit)
: Push flag terminal (1) home until
locking tab (2) engages.
: Push the red and black wires into
the guide (arrow) – the red wire
must be under the black wire.
1166RA107 TG
1
1166RA108 TG
2
1
: Push the ignition lead (1) fully
into the guide (arrows).
– Reassemble all other parts in the
reverse sequence.
7.4 Testing the Ignition
Module
Install a new spark plug before
starting the test.
The engine may start and
accelerate during the test.
– To test the ignition module, use
either the ZAT 4 ignition system
tester 5910 850 4503 or
the ZAT 3 ignition system tester
5910 850 4520.
If a spark is visible, the ignition
system is in order.
– If no spark is visible in the
window, check the ignition
system with the aid of the
troubleshooting chart, b 7.13
The test refers only to a spark test,
not to ignition timing.
1166RA109 TG
1
7.4.1 Testing Ignition Module
with MDG 1 Engine
Analyzer
The ignition module can be tested
simply, reliably and quickly with the
STIHL MDG 1.
The following points are checked
during the test:
– Ignition voltage
– Ignition spark
– Short circuit
– Remove the filter cover
– Before starting the test, check the
spark plug and replace it if
necessary – use only spark plugs
recommended by STIHL.