Stihl MS 251 - Page 57

56 MS 231, MS 231 C, MS 251, MS 251 C
Check the flywheel:
– Have pole shoes turned blue?
– Install new flywheel if necessary,
b 7.6
Air gap:
– Check ignition module/flywheel,
– reset if necessary, b 7.3
Check the ignition lead:
– Severe chafing?
– Spark plug boot: Holes/cracks?
– Resistance: spark plug boot to ground:
spec. 1.5 – 12 kΩ
– Check resistance of ignition lead (spark plug
boot and ignition module removed)
Spec.: < 10 Ω,
If necessary, install new spark plug boot and/or
ignition module,
b 7.5
Check short circuit wire:
– Wire damaged?
– Connectors firmly seated?
– Check continuity, replace wiring harness if
necessary, b 7.7.1
1
3
yes
no
2
Powerful
spark?
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