re: #503 Slumbering Behemoth

Check the spark when it is cold and working versus when it is warm and not working. You can have “spark”, but sometimes it isn’t sparky enough. Get some starting fluid, WD40, or some gas in a small squirt bottle.When it warms up and fails, give it some fuel and see if you can get it to cough.
Some systems have a different fuel path for “warming up” than for “running”.

Luck to you.