No Spark with Plug, But Spark from Lead.

[DazzaJay]

Mower won't start - No Spark.

We changed the Spark Plug, Still no Spark.

We changed the Magneto - We have Spark! (For a day)

Now, we have Spark from the Spark Lead when we ground it, BUT no spark with Any new Spark Plug.

Plugs check out fine with a Multimeter. It's almost as if there isn't enough power to make them spark though.

Could the Magnet in the Flywheel not be working as it should?

 

[EngineMan]

What about the air gap, is there any rust on the flywheel. make sure coil has good ground to engine block.

 

[DazzaJay]

Spark Gap is set correctly to the measurements listed in the Service Manual.

No major rust on the flywheel.

All the grounding points for the coil are shiny and clean.

 

[EngineMan]

What about air gap on the coil.

 

[bertsmobile1]

Do you have the kill wire connected ?
If so remove it and try again.
Spark returns = short in the kill wire of switch.

 

[DazzaJay]

What about air gap on the coil.

I think I'm just unfamiliar with this term. Is that the space between the Coil and the Flywheel Magnets? - If so, It's set to .012"

Do you have the kill wire connected ?

The same issue with the kill wire disconnected.
Lead will spark, Plugs won't.

 

[Boudreaux In Eunice La.]

Dazza where did you take the kill wire off from ?? The coil itself..........?

 

[DazzaJay]

Dazza where did you take the kill wire off from ?? The coil itself..........?

Yeah, It just has a little Push-on connector for it.

 

[Boudreaux In Eunice La.]

Seems like you have a bad coil......... Try a known good used one......

 

[bertsmobile1]

Now for the burning question,
Did you buy the replacement from a mower shop, a real retail outlet or a pretend on line shop ?
Ever wondered what happens to all the parts made in cheap labour countries that fail the QC testing for Briggs /Kohler / Honda etc ?
They ultimately end up on the site of an on line seller at an unreal low price, truthfully advertised as OEM part, they just neglect to tell you that they are quality control failures.
If it came from a mower shop take it back and ask them to test it. If the counter staff go red in the face then slink off like a sly dog & give you a replacement, naked then it is a knock off of dubious quality.
Good ones come in branded boxes ( or bags ) and will have both a part number and batch / serial number on them,.