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Mower stalls out after about an hour of run time

When I engage the blades on the mower it runs fine for about an hour or so but then begins to stall out. I have to let the mower sit for awhile then I can resume mowing, but it will stall out again after awhile. I have replaced the fuel filter, oil/filter, blades, air filter and greased all lube points on the mower.

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I would start with the fuel cap, but probably the coil if its a single cylinder,,,

Posted on Jul 12, 2013

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My Husqy was doing the same thing and had it into two shops and they all thought I was on crack as they never got it to die. I happened to be talking to a customer of mine who used to do small engine repair and he said replace the gas cap. Apparently they are vented and sometimes those vents get clogged. As you mow it sucks gas into the mower and the tank compresses because it can't get air. Eventually the compression is stronger than the suction to the engine and voila, no gas and you die. As you let it sit, the tank slowly pulls air back into it going back to it's original size and you can start it again. Quick fix if you can't find a cap is when it dies take the cap off and let it expand, put the cap back on and start her up.

Posted on Aug 08, 2010

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A few possibilities

1. If engine runs hotter than normal it can eventually heat up the carburetor to the point that there is a vapor lock. Blockage caused by gas bubble: a bubble of vaporized gasoline that blocks the normal flow of fuel. Problem goes away when things cool down. If that is the problem, you need to solve overheating problem. Since you have changed the oil, might be something blocking airflow to the flywheel which has the cooling blades on it. Or cooling blades are filled with debris. Make sure vent hole in gas cap is not blocked

2. Could be bad coil, or condenser causing the windings to act up when they are hot and have expanded they short out (kill engine) on their own casing. After they coil and shrink, they un-short themselves.

Posted on May 14, 2009

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