Why does my Ryobi weedeater stall after starting when I adjust throttle?

https://video.search.yahoo.com/search/video?fr=mcafee&ei=UTF-8&p=ryobi+31c+weedeater+will+not+idle&type=E211US1494G0#id=1&vid=3a28cd20d10b0a98f6fa51d97cea0dfc&action=click
This site will show you how to adjust the carb idle.

Check the throttle cable connection at the carburetor throttle linkage, it (cable) may be broken or the carburetor linkage is broke.

Those carbs are a pain. Try arousing the idle screw, turun it to the right, then try to see if it will idle. You will have to tinker with the adjustment screw and the idle screw. Eventually you're gonna need a new carburetor. You can rebuild it, BUT , chances are those cheap carburetors never are the same.

Make sure u r not getting to much fuel. With switch off pull string twice then turn switch with throttle cable helded wide open try to start.good luck.new dose not mean adjusted good luck

i had a similar problem last year. finally took it to a repair shop..they replaced the diaphram under warranty. seems to be ok now, though i am not overly impressed with this machine

Sounds as tho it needs a minor carburetor adjustment. It's not getting enough fuel when you pull the throttle. Don't know if the owners manual addresses this issue or not, may want to check.

Yep had same problem it would run for about 20-30 sec and then just stall.
solution is the diaphragm on the side of the carby I swapped mine for the same one in my blower and it fixed the stalling problem.
The diaphragm operates the fuel into the carb. loose fuel lines can cause similar problem.

can be your plue

Here was my solution:
I was having problems with my ryobi cs30 weedeater also. It would start up fine on full choke, but i could not give it more than half throttle or ever take the choke off or it would stall out. I replaced fuel mixture, spark plug, spark arrestor/exhaust, fuel lines, cleaned carb, and still nothing! I was considering getting a better machine. Then i decided to play with the carb adjustments.(on my cs-30, they are two screws on the carb that have a "L" and "H" next to them) I dont think you can get the specialty tool for adjusting the carb unless you are a repair tech, so i just took a Dremmel tool with the circular cut-off wheel to the head of the specialty screws and made them into "flat-head" screws so i could adjust them with a regular screwdriver (if you dont have a dremmel, get one!) (As i was cutting into the head of the screws, i also cut into the casing protecting the head of the screws that was in the way, this does not cause any damage to the unit, that casing is only there to keep "un-certified" people from adjusting it for themselves.)
Now to the easy part: The "L" screw adjusts the idle fuel mixture and the "H" screw adjusts the full throttle fuel mixture. turning the screws clockwise make the machine run leaner (less fuel) and counter clockwise makes it run richer (more fuel).
-I started out by turning each screw 1/2 turn counter clockwise and started it up, then as it was idling, i started adjusting the "L" screw as i was moving the choke position to run, after a few full turns counter clockwise of the "L" screw, it was idling perfectly in the run position, then i did the same thing the the "H" screw while holding down the throttle and i got it to run perfectly in the run position. Now it is running way better than it ever has. I hope this helps everyone.
Good Luck!
* For this specific problem, i would say you should probably just adjust the "L" screw and hopefully that will help

Here was my solution:
I was having problems with my ryobi cs30 weedeater also. It would start up fine on full choke, but i could not give it more than half throttle or ever take the choke off or it would stall out. I replaced fuel mixture, spark plug, spark arrestor/exhaust, fuel lines, cleaned carb, and still nothing! I was considering getting a better machine. Then i decided to play with the carb adjustments.(on my cs-30, they are two screws on the carb that have a "L" and "H" next to them) I dont think you can get the specialty tool for adjusting the carb unless you are a repair tech, so i just took a Dremmel tool with the circular cut-off wheel to the head of the specialty screws and made them into "flat-head" screws so i could adjust them with a regular screwdriver (if you dont have a dremmel too, get one!) (As i was cutting into the head of the screws, i also cut into the casing protecting the head of the screws that was in the way, this does not cause any damage to the unit, that casing is only there to keep "un-certified" people from adjusting it for themselves.)
Now to the easy part: The "L" screw adjusts the idle fuel mixture and the "H" screw adjusts the full throttle fuel mixture. turning the screws clockwise make the machine run leaner (less fuel) and counter clockwise makes it run richer (more fuel).
-I started out by turning each screw 1/2 turn counter clockwise and started it up, then as it was idling, i started adjusting the "L" screw as i was moving the choke position to run, after a few full turns counter clockwise of the "L" screw, it was idling perfectly in the run position, then i did the same thing the the "H" screw while holding down the throttle and i got it to run perfectly in the run position. Now it is running way better than it ever has. I hope this helps everyone.
Good Luck!