50 MS 440, MS 440 C
: On machines with carburetor
heating, push the protective
tubes back over the connections
and unplug the leads (1+2).
– Remove the interlock lever –
b 10.2
VA
176RA335
2
1
– Remove the protective tubing
over the plug connection on the
lead from the generator to the
handle heat shield.
: Unplug both lines and remove the
protective tubing.
– Pull the wire out of the grommet.
VA
176RA173
: Unplug the terminal sockets of
the short-circuit wire (1) and
ground wire (2) from the contact
springs.
: On machines with handle
heating, remove the heater
switch (3) – b 14.2
VA
176RA174
3
2
1
– Remove the wiring harness.
Reassemble in the reverse
sequence.
– After insert the wiring harness,
press the leads properly into the
retainers
– Insert the grommets correctly in
the openings in the tank housing.
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.
: Unplug the short-circuit wire
(arrow).
VA
135RA111
– Connect the ohmmeter to ground
and the short circuit wire.
– Set Master Control lever to "$"
The measured resistance must be
around 0 ohm. If the value is
distinctly higher, there is a break in
the wire somewhere and the wire or
slide control must be replaced.
– Set Master Control lever to "#"
The measured value must be
infinitely large, otherwise replace
the slide control.
The following tests must be
performed if faults cannot be found:
– Examine the flywheel for signs of
damage – b 7.3
– Check the air gap between
flywheel and ignition module –
b 7.3.2
Replace the ignition module if a fault
still cannot be located – b 7.1.2
7.5.1 Testing Wiring Harness
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