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Join Date: Aug 2017
Location: Bridgton, Maine
Re: Echo Weed Wacker Crapped Out
Just before I got out of the Army in 1971 I signed up for a seminar with a Ford training rep who taught us several tricks and tips. One of the things he showed us how to make was a spark tester from a probe-type test light....it required only swapping out the light bulb for a neon bulb that was the same size. Of course I lost the thing within a few years, but it sure would have come in handy for checking spark many times over the years. Sure wish I knew what that bulb number was!
There are many types of spark testers, ranging from grounding the plug to the head as Kubota Ronin suggests, to fancy inline testers with adjustable gaps. For your purpose, his suggestion should work just fine. If you can't reach bare metal with the body of the plug, do as he suggests and use a piece of electrical wire with the ends stripped to connect the plug body to a good ground.
My "honey-do list" is so long it has chapters.