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 - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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