Bret, I seen bad plugs go bad after they warm up. On a few occasions I've seen valve seats get hammered into the head. When it warms up, the valve doesn't seat properly a few minutes after of run time. Check the valve clearance. Sometimes the valve clearance is only .005 inch. on some briggs with OVH. I've also seen ignition modules go bad after they warm up.
Then I've heard of and not seen Gremlins that you'll never find unless you're lucky.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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