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Mountfield mower is hunting,what is the likely cause?

I have a mountfield SP470 mower (2003) It has recently started to hunt when running. I have checked the air filter (clean) and the carburator (clean). I'm guessing it may have a fuel supply fault or an air leak in the priming system? Help.
Robert P, April 2009
had problems with mates could well be the intake manifold cracked has is made of plastic

ray, May 2010
link Click here to see other fixes for Mountfield SP470.