Stihl Chainsaw running too fast

[j...@myplace.com]

It's an older saw I bought at a garage sale. Runs well, except it
runs way too fast. There is no idle when I release the trigger.
However, if I push downward on the trigger button, it slows down to
idle. In other words, the problem is in the trigger itself, not a
carb adjustment screw.

My question is what is causing the trigger to not slow down. It's in
the handle, so I'm not sure how to even get to it. When I remove the
top air cleaner cover, I can see the rod that goes to the carb from
the trigger, and when I apply downward pressure on the trigger that
rod is pulled back and the saw slows.

Is this a common problem on these saws? How do I fix it?

Thanks

[Stormin Mormon]

Just a SWAG, there is a coil spring that is missing. That
pulls the trigger down.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
.


<j...@myplace.com> wrote in message
news:1jt1b75jfq5of5c1t...@4ax.com...

[micky]

On Wed, 02 Nov 2011 02:34:04 -0600, j...@myplace.com wrote:

>It's an older saw I bought at a garage sale. Runs well, except it
>runs way too fast. There is no idle when I release the trigger.
>However, if I push downward on the trigger button, it slows down to

I don't know which direction is "downward" but if it's the opposite
direction of "cut harder", it might be a spring. either in the handle
or on the engine. It might be broken or unhooked from whatever it
hooks to.

[Bill]

<j...@myplace.com> wrote in message

On my Stihl chainsaws, choke is by moving the lever all the way down,
then next up is fast idle, then next up from that is regular idle,
then next up is off.

When it is in fast idle and you pull the throttle trigger, it snaps
from fast idle to regular idle.

To fix this problem on my saw, you replace the lever which also comes
with a metal spring loaded piece which is part of an electrical kill
switch, but that spring mechanism/switch also plays the most important
part with the fast idle release.

It can be removed on my saw by removing the carburetor cover and a
screw under the handle. Then removing the connecting rod to the carb.
Also a screw on the side for the electric switch. It snaps out and the
electric switch slides out.

You may have a older or different model from mine. Go to the following
site and ask there. Helps if you give them the model number or post a
picture.

http://www.arboristsite.com/chainsaw

[j...@myplace.com]

Thanks for the info. My saw is called the "Farm Boss". That's the
only means of identification I can seem to find. Where the heck is
the model and serial number? That plate on top that says "Farm Boss"
is barely readable, lettering is worn away. I was barely able to make
out those words. I did find a number stamped in the casting right
below the edge of the removable cover over the air cleaner. That
number is 6361415. That's all I can find after carefully looking over
the whole saw. (Of course there are part numbers on individual parts,
such as that air cleaner cover, and they all seem to begin with 9 1110
with more numbers after that.)

I noticed that the stihlusa.com site has downloadable manuals, but
first I got to know the model number for this saw. Any idea where to
find these numbers?

[Oren]

On Wed, 02 Nov 2011 13:59:37 -0600, j...@myplace.com wrote:

>I noticed that the stihlusa.com site has downloadable manuals, but
>first I got to know the model number for this saw. Any idea where to
>find these numbers?
>

Which manuals apply to the "Farm Boss"? The web site may have a FAQ
on locating the numbers.

[Steve B]

>>I noticed that the stihlusa.com site has downloadable manuals, but
>>first I got to know the model number for this saw. Any idea where to
>>find these numbers?

On the saw would be my first guess.

Steve

[tim birr]

The "Farm Boss" is an 029 -- or Model 29 -- depending what decade.
It's a "consumer saw," meaning there is a bit more plastic, and it's a
bit more clunky than a pro model.

But, it is actually a decent saw, and a pretty good workhorse around
the house -- or "farm."

As for your problem, I'd think I'd run a tank of non-ethanol premium
gas, with some Seafoam fuel treatment in it, just for the heck of it.

I have a suspicion that might help. It won't hurt.

[Oren]

On Wed, 2 Nov 2011 13:08:12 -0700, "Steve B" <ste...@gmail.com> wrote:

>>>find these numbers?
>
>On the saw would be my first guess.
>
>Steve

... under the saw dust - next guess.

[hr(bob) hofmann@att.net]

> find these numbers?- Hide quoted text -
>
> - Show quoted text -

That almost sounds like a Sears Craftsman style of number????

[j...@myplace.com]

On Wed, 2 Nov 2011 13:08:12 -0700, "Steve B" <ste...@gmail.com> wrote:

>

And here I was looking at the label on my underwear for it....

[Oren]

Don't do that.

[Bob F]

Just worked on my fathers last week.

Stihl MS290 farm boss

"Star" screw under the end of the handle will allow removeing the black top of
the handle. the right size flat blade screwdriver will work on it is you don't
have the "star" bit.

There's a spring steel rod that clips under the safety latch on the left side. I
don't remember whether the throttle spring is anything additional than the
spring on the carb.

The parts pages on the Stihl site will help a lot.