Stihl MS 650

54 MS 650, MS 660
Installing
: Fit the connector (1).
: Position the contact spring below
the pin (2).
VA
178RA069
1
2
: Clip the contact spring to the pin.
VA
178RA129
: Pull the front end of the contact
upwards onto the cam.
178RA070
VA
If the spark plug and ignition lead
with spark plug boot are in order,
check the resistance of the short
circuit wire, ground wire and contact
spring.
– Remove the fan housing with
rewind starter – b 8.2
1
178RA071
VA
: Disconnect short circuit wire (1).
– Connect the ohmmeter to ground
and the short circuit wire.
– Set Master Control lever to “$“
The resistance measured must be
about 0 Ω. If it is much higher, the
reason is a break in the wire. The
wire or contact spring has to be
replaced.
– Set Master Control lever to “#“
The resistance measured must be
infinitely high. If not, fit a new short
circuit wire.
If no fault can be found, carry out
further checks:
– Inspect the flywheel for damage –
b 7.3
– Check air gap between flywheel
and ignition module – b 7.2.1
It neither of these checks reveals a
fault, install a new ignition module –
b 7.2.1
Reassemble in the reverse
sequence.
7.5 Testing Wiring Harness