Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Will your engine restart after it stalls?
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Thanks for letting me know. There is a possibility that your compression could be dropping too low, after your engine heats up.
Do you have a compression tester?
No problem. Are you familiar with removing your muffler?
When you have a chance, remove your muffler, to see if you notice any scoring on your piston and cylinder.
If your piston or cylinder has some wear, it can get worse as your engine heats up.
Yes, like scratches. Keep in mind that heats causes expansion. If you already have a small amount of compression lose when your engine is cold, it will gradually decrease more as you operate your engine.
I agree. The other possibility could be a lose of spark, after you run your engine for 20 minutes.
Have you checked for spark, immediately after your engine dies?
These are troubleshooting questions, to help pinpoint our problem.
Thanks for this information. I would remove your muffler, then go from there. It will also be great if you can borrow a compression tester.
You would just remove your spark plug, then insert the tester in your spark plug hole. You can use gloves as you are doing this.
100 psi or up ...
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Very good! I would look at cylinder and piston through your muffler, just to be sure the parts are bad. The problem could be rings only.
You are very welcome!
Thank you for checking. You have already checked to see if you are still getting spark to your spark plug after your engine stalls. You stated that your spark is ok. Have you tried a new spark plug? Also, if your fuel tank is not properly venting, you fuel flow could get restricted after 20 minutes.
You and I can continue from here. I wouldn't give up and throw it away.