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LAWN MOWERS?

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
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
link Click here to see other fixes for Mountfield.