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Why does my Briggs & Stratton Soverign 35 runs very rich?

My Briggs & Stratton Soverign 35 runs out of fuel very quickly, the spark plug is black after each run, and the engine seems not to have much power, although it will start easy enough. I have cleaned the air filtre, thinking this would suck more fuel if blocked. The carburetta looks clean and all gaskets seem to be ok. What can I do?

Steve
July 2009
Many thanks Phil Sanders, Changed the Diaphragn, it seems to have more power and no black smoke from the exhaust. Thanks again.

Steve
July 2009
Change the carb diaphragm. Guaranteed fix - costs about £2

phil_saunders(a)bigfoot.com

Phil Saunders
July 2009

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Find out how to mend Briggs & Stratton lawn mowers