ORIGINAL: DAN REISS
Thanks for all your responses. I was thinking about the spark plug gutting trick for some time. I'll work on that to get going on the timing checks. Richard, aka spaceworm, where did you get that sophisticated one you keep mentioning? Dan.
I have had it since my Yamaha CS3C and DT175 back in the 70's. I have to see if it has any markings on it as to make, and post a picture of it here. That was when points were used (remember them?) and a buzz box was connected across the points to hear when they opened as the crank was turned.
Sincerely, Richard