Short Circuit Wire; Testing - Stihl MS 271 Manual

3
1
2 1
: Fit the puller (3) 5910 890 4504
on the flywheel and tighten the
screws (1) as far as stop.
– Tighten the screws uniformly.
Models with ErgoStart
Take care not to damage the pawls.
All models
: Screw home the thrust bolt (2)
clockwise until the flywheel is
released from the crankshaft.
– Remove the puller (3)
5910 890 4504 from the flywheel.
The flywheel and magnet
poles (arrows) must not be
damaged or have turned blue.
Replace flywheel if necessary.
MS 271 C, MS 291 C
Models with ErgoStart
– Check the pawls for freedom of
movement and signs of damage,
b 8.4.
All models
The flywheel and crankshaft stub
must be free from grease before
assembly.
Make sure the key (arrow) engages
the slot in the crankshaft.
– Set the air gap between the
ignition module and flywheel,
b 7.3
– Reassemble all other parts in the
reverse sequence.
7.7

Short Circuit Wire

The ground and short circuit wires
are combined in a wiring harness.
If the spark plug, ignition lead and
spark plug boot are in order, check
the short circuit wire.
7.7.1

Testing

– Remove the fan housing, b 8.2
2
1
: Pull the short circuit wire (1) out
of the guide (arrow) and take it
away.
– Connect the ohmmeter to
ground (2) and the short circuit
wire (1).
– Set the Master Control lever to
0
" ".
The resistance measured must be
about 0 Ω. If it is much higher, the
reason is a break and the wiring
harness has to be replaced, b 7.7.
– Set the Master Control lever to
"F".
The resistance measured must be
infinitely high. If not, replace the
wiring harness, b 7.7.
Perform the contact and continuity
test on the ground wire too.
If the ground wire is damaged, the
complete wiring harness has to be
replaced.
– If no fault can be found, check the
ignition system with the aid of the
troubleshooting chart, b 7.8
– Reassemble in the reverse
sequence.
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