[Vwdiesel] Off topic - electronic ignition testing

[Val Christian]

OK, I shamelessly admit that this is way off topic.  I've been wrestling with
a string trimmer (Shindawa 2500ss, aka Green Machine 2500ss) which 
intermittently starts.  Once started it runs fine (usually for a tankful)
until I shut it down.  Then it won't start.

Does anyone have suggestions for bench testing an electronic (magneto) 
ignition?

Val