I had the same thing happen on a 10 hp B&S engine exh valve on a portable gen. Power went out early evening, it would start but bucking every few seconds. Pulled the side cover and keeper was adrift and cocked under the valve spring.
Got it real clean with carb cleaner spray, put a couple drops of crazy glue on the retainer/bottom of the spring and pushed it back in place.
Run it for ~14 hours until power came back on next morning. Bought a new valve, spring, & keeper. That was 3 years ago, new parts still in the packages. Gen has run about 50 hrs since using it to run pumps, tools, etc waiting for it to happen again.
Bought a new gen with Honda engine for the dozen or so times a year that the power goes out in this area.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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