I just rig up a known good spark plug.

Solder a wire to the thread, and pop an alligator clip to the other end, then cut the side post of with some wire cutters, so that the spark has to jump all the way to the outer rim.

I'll get a photo of the finished product up when i can.

You can also solder a medium alligator clip straight onto the thread.

Cheers
Ty

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