56 Series 4180 Powerhead
Check the flywheel: 
Have pole shoes turned blue?
Install new flywheel
Check air gap
and reset if necessary
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 
Spec.: < 10 Ω,  
If necessary, install new spark plug boot and/or 
ignition lead,
if ignition lead is molded to ignition module:
– Install new ignition module
Disconnect short circuit wire 
from ignition module
1
3
yes
no
 
2
Ignition
spark?