STihl weedwhacker wont stay running

[LawnMower]

One of my weed whackers is a Stihl Home owners unit.
I’m having a problem keeping it running. I have to run it on half choke all the time or it will act like it’s running out of gas and then stall. It wont stall however if I run it at almost full throttle. No matter what I do to the carburetor adjustments, it acts the same. In fact I don’t seem to see a noticeable difference in the way it runs, when I fiddle with the crews. Although right now it’s running very rich at full throttle.

If I turn the choke completely off it runs for a wile, then its leans out and stalls, unless im running it at full throttle. I notice that it runs a little better when it has burned through most of a tank of gas. It runs the worst on a full tank. It almost seems like the gas cap isn’t breathing.

Any ideas?
:confused:

[CMLLawnServices]

check to see if the crank case is leaking . run some gasket black on it and it should be fine. 2 strokes won`t run very well if they draw air through the crank case.

[LawnMower]

What is gasket black? Where on the crankcase should I put it? Near the rear of the engine where the carburetor is?

Thank you for responding

[bls47303]

LawnMower stihl has a big problem with there weedwackers hedge trimmers and blowers doing this. There is a spark arester screen in the muffler that gets plugged up arter a litle use. to fix the problem take the exhost outlet off of the muffler and use a pair of plyers to pull the screen off then replace the outlet. we took one of ours in and it took them like 2 min to fix it. so i asked them ehad they did. u do not need the spark arrester in there they run fine without them. we take ours out as soon as we get any new stihl equipment.

[LawnMower]

Ya I don’t run spark arrestors in my Stihl equipment either. I took it out, so that’s not the problem. Thanks for the response though.

John

[greenman]

I have having the exact same problem with my old Stihl trimmer!! :mad:

[mower17]

Did you check to see if any of the carburetor gaskets were cracked or worn out. Maybe cleaning and rebuilding the carburetor might help. I think they use a diaghram in the carburetor, if that gets stiff and brittle, she won't run right.

[Fish]

Look at the fuel line for major cracks. Take it back to a Stihl
dealer for free replacement.
Fish

[bls47303]

LOL Just had 2 stihl hedge trimmers that are 2 years old start doing the same thing

[greenman]

Yeah, i get so frustrated with it. I think im gonna switch to all Husq equipment, or Shindy.

[bls47303]

i am gonna rebuild the carb or just put a new one on. i think that will fix the problem with mine

[CMLLawnServices]

lawnmower i e-mailed u about gasket black