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Champion mower?

the engine is a Briggs & Stratton 3.7 it starts fine but while it runs the revs keep 'hunting' down to very low revs, I have fitted a new spark plug but the fault still occurs it appears to be running very 'rich'
help please
Derrick, May 2009
link Click here to see other fixes for Briggs & Stratton 3.7.