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 Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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