schematic for YM 144v834h401

spudgun

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Sep 11, 2018
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Got a 94 yardman rider, B&S twin motor. Lost spark on both cyl.

Question is, the yellow wire from the ign system is this a shut off or turn function.

I disconnected it and still no spark, wonder if I short it to ground will this give me spark?
 

bertsmobile1

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Nov 29, 2014
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If the coil has only 1 thin wire it is a ground wire.
Grounded = off
Open = on

If both coils don't work suspect a short putting battery voltage down that wire.
The briefest contact with power, even some cheap multi meters can destroy the control chip in the coil.
Testing is to remove this wire and check for a spark.
If both have gone west at the same time suspect a short to power in this circuit.
 
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