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I HAVE A 18.5 HP. 42 IN. CRAFTSMAN RIDING MOWER WITH A BRIGGS ENGINE. I HAVE REPLACED FUEL FILTER, FUEL LINES CHECKED CARB (LOOKS LIKE NEW), CHANGED PLUG, NEW FUEL, CHANGED AIR FILTERS, CHANGED OIL AND FILTER , AND CLEANED COOLING FINS, AND IT RUNS GREAT FOR ABOUT 15 OR 20 MINS. AND DIES. LET IT SIT FOR A WHILE AND IT DOES THE SAME THING. NOONE SEEMS TO KNOW WHAT THE PROBLEM IS. COULD IT BE A SWITCH ?

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Hello,

Definitely sounds like a thermal issue, likely with the ignition module.

Try this: Wait for it to cool, then start it up again. Run it as you normally would, and wait for it to die. When it does die, pull the spark plug boot off the plug, use a spark gap tester, and see if you still have spark. If you don't, then suspect the ignition coil, perhaps the disable wire might be grounding out as it snakes around and eventually to the off switch.

If you still have spark, then check the fuel shutoff / anti-diesel valve (if equipped) on the bottom of the carburetor bowl. Look for damaged wiring. When you turn the ignition on, and try to start, this valve should have 12 volts going to it to allow fuel to flow. Otherwise, look for problem between valve and on switch.

Another area to check, especially if it tends to backfire, is that the woodruff key (shear pin) on the flywheel isn't damaged (partially sheared).

Posted on Aug 27, 2010

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