Stihl MS 171 Manual page 52

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2
3
Check operation
of switch shaft:
– Short circuit wire chafed?
– Does contact spring make contact
with short circuit wire in position "#"?
– If necessary, install new
wiring harness,
b 9.6.2
Powerful
yes
spark?
no
Install new
ignition module,
b 9.1.1
Engine
yes no
runs
Machine runs trouble-free, –Look for fault in fuel system
no further action necessary or carburetor
– Check engine for leaks
– Check position of flywheel on
crankshaft,
b 8.2, b 9.5
MS 171, MS 181, MS 211 51