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B&S mower looses power and stall after 10 minutes?

My old mower starts and runs well for about 10 minutes then rapidly looses power and stalls. I let it sit for 2-3 and starts again but then progressively looses power and dies over and over. Lucky I have a tiny lawn but would like to fix problem. Someone suggested magneto problem, Any Clues?
John K, February 2005
yu may need a new sparkplug it may look ok onthe outside but it might be cracked inside an check too make sure that the carbi is sealed so it won't be sucking in air

ruffryda, March 2005
Sounds like no oil. Should hold 1 pint of oil
(assuming yiou have at least 1/2 tank of petrol)

peter, February 2005