Small Engine Problems? Ask an Engine Mechanic for Answers ASAP
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For long does it run? Are we talking 5 seconds, or 5 minutes?
I would do a compression test next, to check that there are no cylinder, ring, or valve problems.
You can't do it without a tester. And you can't do basic engine health checks without one. They aren't expensive:https://www.amazon.co.uk/Alight-Tools-Compression-Cylinder-Automotive/dp/B08C5J3GLP/