The string on my Ryobi P2005 18v weed eater keeps getting longer each time I turn it on. How do I get it to stop advancing the length of the string? Yes, it is wound in the correct direction.

replace motor



https://www.partswarehouse.com/Ryobi-Homelite-24V-Motor-RY-230049018-p/ry-230049018.htm?gclid=EAIaIQobChMI3abX36nR3AIVD9tkCh2CMAt_EAQYAiABEgIYavD_BwE&Click=365719

Trimmer cord can become brittle and break off prematurely, the material can absorb water and become more flexible, so you should store any new cord in a bucket of water to keep it flexible,

full strings (long) take power to run and if there is a problem with the carby ( blockage or diaphragm) then that extra power required will be shown as a shortage of fuel if the carby is not up to it

check this manual (page 14-15)
http://www.imarksweb.net/aws/view.php?u=aHR0cDovL3d3dy5yeW9iaXRvb2xzLmNvbS9wcm9kdWN0X21hbnVhbC9maWxlX3VybC8zNjcvUlkyOTU1MF8zMTBfZW5nLnBkZg==

Hello,
Pump the gas bubble near the black box air filter. Start pulling the string. Keep pulling until it turns.
Thanks

Find the idle speed screw (not the jet screw) and turn it CW until the engine idles without dying. If too high, the string head will turn all the time. Hope this helps

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.

For manual go to;
http://www.poulanpro.com/poulanpro/manualSearchPrepare.do;jsessionid=332BA6FC1EA2792C79A0A463204716AA

Preparation Instructions


1. Press the lock and rotate the spool counter-clockwise.
2. Remove the locking ring if your weed eater has one.
3. Take off the automatic feed button.
4. Wipe away any debris.
5. Push down on the spool to release the locking tabs.
6. Remove the spool from the chamber. Restringing the Weed Eater
7. Feed the line into the lower deck, traveling the line in an upside down J fashion (almost like sewing on a button but do not tie off the line). This secures the internal end of the line.
8. Wrap the line following the directed arrows. Do this until it wraps to the depth of the chamber.
9. Secure each of the lines into its own upper and lower deck grove settings.
10. Install the spool back into its chamber.
11. Pass the lines into the left and right holes and snap the spool into place.
12. Once the spool is in its sleeve and fed into its left and right eye holes, pull both ends simultaneously.
13. Reinstall the locking ring if necessary.

Do it yourself repair: common repairs for a weed eater Amazingly, weed eaters are one of the simplest yard tools to take care of. One of the first things you should do to keep your weed eater in good condition is to clean it. It is important not to clean your weed eater with water or gas, which may destroy the engine. The best, and easiest way to clean it is by blowing off dirt and grass with an air compressor or a leaf-blower after every use. The next most important thing to maintain on your weed eater is string. When the string gets low you can remove the lower part of the head (the part that the string comes out of) by pushing in slightly and turning the head counterclockwise. Cut the new string no shorter than 6 inches or the weed eater will not advance the string properly when in use. Thread the string back though the guides, making sure to follow the arrows on the guide. If the string is not put through the guides the right way, the head may pop off during use. Next, replace the bottom of the head by pushing and turning clockwise. You can totally skip this step by buying a string replacement cartridge. Though it is much more expensive, it saves you the trouble of having to restring your weed eater yourself. window.google_render_ad(); If you find that the head of your weed eater is worn on bottom or hard to get off to replace the string then it is time to replace it. This can be done very simply by unscrewing the two screws at the top of the head and slipping it off. Then, just slide the new one on and tighten the screws. After a few months of use, you may find that your weed eater is losing power or that it is making a strange lower pitched noise. This may be caused by a dirty filter. To check, unscrew the knob or wing nut on the carburetor. Inside you will find a small square screen, this is the filter. If the filter is gray or black then it is time for it to be cleaned. The easiest way to clean it is to blow it out with an air compressor. It can also be washed with plain water, but you must let it dry before placing it back into the carburetor. Once the filter is white or only light grey it is ready to use again. Always make sure to mix the gas and two-cycle oil in the proportions that are listed in the weed eater’s manual. Never use anything but two-cycle oil, normal car oil will not work and will damage your engine.

What model number is your Ryobi?

I have one of this trimmers. It is simple to replace the line. 
-First line up the arrows on the bottom of the spindle. 
-Then feed the line back in one of the holes in the side of the spindle (this is the same hole that the cutting string comes out of). 
-You will see the line come out of the bottom of the spindle. 
-Take that line a place it in the hole on the bottom of the spindle. 
-Leave about 9 feet of string hanging out of the weed eater (do the same with the other side). 
-Then turn the inside wheel (I can't remember if it is clock wise or counter clock-wise but it will only turn one way) most of the string is rolled into the spindle. 
-Cut the string of about 5 inches out of the weed eater. You're ready to cut!