As others have mentioned switching spark plug may be a good idea regardless of what you see initially when checking for spark. The Powermore comes with a Torch brand plug, typically F6RTC. Lots of complaints about them. Cross ref to NGK BPR6ES, or even Champion RN9YC I think. You said it was clean looking, but wonder if the old timer put some premix 50:1 in there? Should still work, just smoke, but you never know.