You can take the plug out, hook it to the wire, and lay the plug against the
metal part of the engine (the plug has to be in contact with metal to
complete the electrical circuit). Pull the cord and look for the spark (it
helps if it's in a fairly dark place). Make damn sure you don't have any
gas around. Don't hold the spark plug while doing this because the thing
puts out 20,000 volts.
If you see a spark, you have fire and need to check the fuel system.
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