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Mend Mountfield Lawn Briggs Running

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I have a Mountfield with a Briggs and Statton engine. When engine running it continually reves up and down. Any suggestions

DOH HARA
April 2009
MountfieldGarden Tools, Lawn MowersLawn Briggs Running
THANKS JOHN,
WILL HAVE A LOOK AT THAT.

DOH

DOH HARA
May 2009
This is a small blockage in the carburettor main jet. Its the governor system that tries to accommodate this, hence the revving up and down.

John
April 2009

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Mountfield Lawnmower Revving Issue - Help!