Going the ‘KISS’ route can easily be done to with a few simple items everyone probably has laying around their shop. I like these ones as the air gap can be adjusted quite wide.
– Two good spark plugs, either new or used.
– Two water hose clamps.
– Two Cable clips
Another easy way to make a simple spark tester is to screw good plugs into an old cylinder head and then attach a ground wire to the head and a cable clip to the other end of the wire. The clip clips onto any good ground so spark can be checked for all cylinders at once. I can’t find a photo but you should be able to get the idea.
