Intermittent misfire

[Andy Bennett]

The one thing that hasn't been mentioned is the coil itself.
Would be worth swapping out if not already done as internal breakdown when hot would not be the first and it's easy and cheap to find out.

Also lots of examples of coil problems being discounted because replacing it makes no difference, only to find that the new one is of poor quality and also faulty, so definitely worth swapping with a known good one.

Also make sure it is wired correctly. I ran mine for years before realising it was wired the wrong way around and produced a stronger spark when correctly wired.

Andy