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Mend Briggs & Stratton 3.7 Lawn Mower Engine

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
Briggs & StrattonBriggs & Stratton 3.7Garden Tools, Lawn MowersBriggs & Stratton Lawn Mower Engine

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Briggs & Stratton 3.7 Hunting Revs - Help!