57Series 4180 Powerhead
Check # / STOP-O function 
on slide control or separate stop 
switch 
no
Install new
ignition module
yes
no
Look for fault in fuel system 
or carburetor, 
check engine for leaks, 
check position of flywheel on 
crankshaft
yes
Check operation of slide control 
or separate stop switch 
 Short circuit wire chafed?
 Contact gap (contact springs) 
If necessary, install new ignition lead 
and/or contact springs, microswitch 
Re-connect short circuit wire
2
3
 
 
 
Ignition
spark?
Engine
runs