Lot's of iffy ways to check spark at the plugs, take one out
ground the shell to the black, hold a screwdriver between the
terminal and the block with a slight gap, get your kid brother
or wife to grab holt of the wire and the fender, unless they've
got a pace maker. Try the previous methods while
pulling on the lawn mower starter rope, good luck.
Or you can free up your hands and do it the easy way.
For five bucks these are a great item to test for
spark to the plugs, I've got a couple in the test
equipment drawer:
http://www.harborfreight.com/inline-ignition-spark-checker-69014.htmlDG