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The rotor looks bent in the pic. I had one like that & I believe it was caused by my carelessness in not setting the cap straight down. I tried to rebend it with no success. It was misfiring/snapping badly. New cap/rotor & all was good. Dont know if I needed to replace the cap as that violated my rule of only 1 part change at a time but I had one handy



I think you are on to something. I looked in the cap and the button is all chewed up, thats what those filings are all over the rotor it looks like. I am guessing the bent rotor sanded the button down and maybe enlarged the gap to where the spark couldn't arc across it?

I am guessing maybe when hot, this enlarged gap got wide enough to cause this?

I popped the cap a month or so ago (before this started happening) and the rotor was squeaky clean. I guess I got a bit over excited when I put the cap back on.

I have a new cap/rotor on order so we will see if this fixes the problem.