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engine hunts spark plug gathers sooty covering within minutes of cleanig?

Mountfield 470 petrol mower (3 plus years old)

Nothing more to add except fault has suddenly arisen
Derk, June 2011
Carb diaphragm ruptured. Replace.

phil_saunders(a)bigfoot.com

Phil Saunders, June 2011
link Click here to see other fixes for Mountfield.