Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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This sounds like you have an ignition coil problem. After running under a load and getting hot the ignition coil is not firing properly which is causing poor performance. They may have trouble duplicating the problem unless they actually take it out and mow with it for the amount of time that you are before the problem starts. Most likely they are just test running the machine without mowing or loading it any at all. The first thing that I would do is check the spark when the problem actually occurs.
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