“Engine started running rough and revving after two months”
I purchased the 550 series Briggs & Stratton 21" Rear Discharge mower (model 917.388191) in March 2009. After only a few mowings in the spring the engine started sounding funny. It would rev up and then slow down. There is no speed adjustment on this model. Fortunately it continues to start and mow the lawn, but it doesn't sound right. After the Fall season ends, I plan to bring it in for a warranty repair. Fortunately it has a two yr warranty
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