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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
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