On Sat, 22 Mar 2008 12:32:10 -0700 (PDT), "
wrote:

On Mar 22, 2:15 am, Vic Smith wrote:
You may get more on-target suggestions if you describe the symptoms
more precisely - such as what load, what rpm variations.

Could be. But in a way I'm trying to avoid doing that because I've
been down that route here and with pros and 100% of people say air in
the fuel. For years I've believed them and labored to get the fuel
system just so and I've spend a lot of money having the pros work it
over, too. It is not a show stopper. I've traveled tens of thousands
of miles with it. But, it is a continual annoyance. So, basically
the last part that nobody has messed with that could reasonably be
causing my problems is the governor. Applying the do the easy stuff
first principle I looked at the beast and it has an adjustment the
might possibly fix or mask the problem and it looks super easy to do.
But, it is factory sealed. So, my question was, in essence, will
vengeful samurai descend from heaven to cause me grave bodily harm if
I tweak that puppy? So far, I think I've gotten a good solid "maybe"
on that. I'm not really asking for a diagnosis of the problem. I
pretty much lost faith in them (though they are always amusing and I'm
happy to read any that are proffered).

Know what you mean. The reason I mentioned that is once in an auto
group somebody reported odd but specific symptoms of stalling in his 5
year old supercharged Pontiac. He was getting all kinds of logical -
but wrong - advice from technicians. It just so happened that a
workmate of mine had that exact car and recently related to me those
exact symptoms. His mechanic couldn't solve it and sent it to the
Pontiac dealer, who quickly fixed it.
This posting activity happened on a weekend and I posted that I would
find the solution from my workmate on Monday. But since I ended up
not working that Monday the original poster started e-mailing me.
I called my workmate to look at his dealer receipt when he went home,
and the only part listed was a fuel pump resistor.
When I relayed this to the original poster, he went into his garage
and had the resistor bypassed and on order within an hour, his problem
was gone, and he thanked me heartily. He seemed the type really fond
of his car and wanting to always do his own fixing. As much as I've
worked on cars, the only time I touched a resistor was on my son's
Sony PS1 playstaion. I melted everything into ruination.
But the car problem solution was an unusually fortuitous set of
events, and usenet worked quite well.
Your situation is different of course, and there is a smaller set of
Yanmar owners, but there's always a chance.
Besides, it makes people feel good to make suggestions, no matter
how irrelevant they are (-:

--Vic