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Briggs & Stratton Classic 35 rich slow running?

I have a B&S Classic 35 which is not running at its normal working speed, but it is consuming lots of fuel !(spark plug gets very sooty). Have replaced spark plug and cleaned filter - regulator appears to be operating correctly. Any ideas?
Gopher, September 2010
Yeah- by replacing it.

pleasant, September 2010
Yeah, I had wondered about that, but there are no obvious signs of wear, no splits etc. Is it easy to tell if it's worn out ?

Gopher, September 2010
Carb diaphragm needs replacing

pleasant, September 2010
link Click here to see other fixes for Briggs & Stratton.