In Reply to: Re: Spark checker posted by Bruce (VA) on March 02, 2018 at 18:33:23:
Wide and blue spark on time, 3/16" should be enough. Orangish, cold weather, moderately heavy oil, an 80% battery maybe not so much.
Coil, most likely, or corroded terminal leads at the cap after low battery assuming all other components, fuel supply, timing, plugs, cap and leads etc. are in good order.