Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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This sounds like a fuel delivery problem. The machine is not getting enough fuel through the carburetor in order to keep it running without the choke being on or closed. You can try adjusting the high speed screw on the carburetor, turn it out about an 1/8 of a turn if you can this should solve the issue that you are having. Otherwise you will need to clean and rebuild the carburetor, install a new repair kit.