Sounds like fuel mixture issue to me if it will run with the choke partially
open. Find the
manual online and mess with the mixture adjustment. It is usually pretty easy.
If that
doesn't work, I'd get a carb rebuild kit or fuel diaphragm gasket and that
should
resolve the issue. The diaphragm can also stick in the carb. Take the carb
apart and look
at the flap on the diaphragm. It should be flexible and not stiff. If it's
stiff, it wont meter
the fuel properly. When you add more air by pressing the trigger, it needs
more gas.
Sounds like it isn't getting it, which is why you need to keep the choke active.
Don't discount a crack in one of the fuel hoses. They can be hidden and be a
RPITA to
find. (Dont' ask how I know this. :/ ) Also clean the spark plug with a dremel
and wire brush attachment if it has been sitting for a while, but I doubt
that's the
issue here.
Brian
battmain@yahoo.com
----- Original Message ----
From: Brian Kemp <bk13@earthlink.net>
To: Shop-Talk List <shop-talk@autox.team.net>
Sent: Thu, March 25, 2010 12:21:52 AM
Subject: [Shop-talk] string trimmer engine won't run
List,
(snip)
The fuel hose was replaced a year ago and looks in good shape. The foam in the
air cleaner was a bit dirty, so I cleaned it. The carb looked like new. The
spark plug was fine. I cleaned the mesh spark arrester on the muffler exit as
it was pretty dirty. I drained the fuel and looked at the in tank filter and
it looked good. Pushing the primer bulb gives the normal behavior of getting
firm after 6 pushes, so I don't think there is any fuel delivery problem.
There are two adjustment screws on the carb, but since they have not been
touched in 10 years, I wouldn't expect they moved. I learned from my Triumphs
that you don't play with carbs if they were working.
(snip)
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