Trimmer head not functioning right

Terry: According to eHow.com:

"

Put on a pair of safety glasses. Remove the fuel cap from the Weed Eater and set it aside. Fill the fuel tank with unleaded gasoline that has been mixed with quality 2-stroke oil in a 40:1 ratio. Replace the fuel cap.

Move the Weed Eater to a safe place and lay it flat on the ground. Depress the fuel bulb located beneath the carburetor approximately six times to prime the engine. Press it slowly so that fuel has adequate time to traverse the fuel line.

Slide the handlebar-mounted engine "On/Stop" switch to the "On" position. Slide the choke lever beneath the fuel tank to the "Full" position.

Depress the "Throttle Lock" lever located beside the engine "On/Stop" switch. Keeping the lever depressed, squeeze the throttle trigger. Release the throttle lock. This sequence holds the trigger in the depressed position, which aids in starting the Weed Eater.

Roll the Weed Eater so that it is resting on the engine and the trimmer head shield only. This will allow the spinning trimmer head to avoid contact with the ground. Brace the Weed Eater by holding it to the ground with one hand. Using your other hand, pull the starter rope quickly until the engine begins to run. Do not pull the rope more than a dozen times. If it fails to start by then, squeeze the throttle trigger and continue to pull until the engine starts.

Allow the Weed Eater to warm up for about 15 seconds, then slide the choke lever to the "Off" position. Let the trimmer run for another minute without touching the throttle lever. After the Weed Eater has warmed up, squeeze the throttle trigger once to disengage the throttle lock. The trimmer is now operational.

Read more : http://www.ehow.com/how_6720315_start-gas-weed-eater.html"

do you have two adjustment screws down in a hole in the carb?
If you do they are the carb. high and low adjustment.
What I do is take a hacksaw and cut a groove right in the housing an the screw heads .that way you can adjust them Good luck

check the compression on your weedeater low compression will cause this

Make sure fuel is mixed correctly, make sure the choke isnt stuck on aswel, ive had it happen to me before when the little blue leaver sticks and it wont rev out properly.

Check these out...

And...

And one more...

too much drag on the edger, try putting some oil or lubricant spray where the edger spins on the attachment.

Sounds like the clutch has taken a long trip south. If the clutch pads are not wore out, try some wd40 on the pad hinges.

rotate attatchment head slightly while inserting driveshaft

They usually have a hex-head bolt cast inside the plastic knob, the head starts spinning inside. You might be able to loosen the knob by gripping it with Vice-Grips really tight, then get a new knob. Should be right-hand thread.

the standard line length is around 3-4". you can leave it as long as you want, provided it does not bog the engine down, or bog down when cutting plants.

however plastic line breakage is typical of older line. it gets very brittle. Also typical of hitting rocks, gravel, cement, asphault, ground, etc.