On Thu, 20 Mar 2008 14:01:05 -0700 (PDT), "
wrote:

I've got a Yanmar 2gm20 that I'm pretty convinced has a problem with
the governor (speed is not well controlled especially when it comes
under load).

You may get more on-target suggestions if you describe the symptoms
more precisely - such as what load, what rpm variations.

--Vic