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Posted on Nov 30, 2008

My Ryobi weedeater engine keeps stalling out.

I was using my Ryobi one day and I flipped it upside down while it was running. It immediately stalled out and now I am unable to rev it up fully because it continues to stall out completely. What is wrong?

  • 8 more comments 
  • Anonymous Dec 06, 2008

    I can crank my ryobi weedeater in choke and it will start. Then I put

    it on run and crank. It will start, then stop after a short time. Than it

    gets harder an harder to start. I have cleaned the carbeurator, checked

    the muffler for clogging. I replaced the fuel tank, because it was leaking.

    I will not run more than 15 or 20 seconds. I found a lot of dirt in the

    carb and blew out all ports with my compressor. Is ryobi mad a me

    or just dying?

  • gose Feb 12, 2009

    I have a Ryobi weedeater and it will start when I have the choke on but then when I try to take the choke off it stalls out. I have checked the muffler and everything else. What could this be?

  • Anonymous May 06, 2009

    I have adjusted the H screw after setting the L screw to the correct idle setting. The machine only will run at idle. I've replaced the fuel filter and the lines. I flushed the careburetor with cleaner. What else is there to try?

  • YardDuck May 15, 2009

    It worked! However I turned the (left) plastic screw, counter-clockwise, and I was able to flip the choke to "C"....now it runs like a champ.

    Thanks so much for the advise!

  • YardDuck May 15, 2009

    It worked! However, I turned the (left) plastic screw counter-clockwise and I was able to flip the choke switch to "C"...now I runs like a champ.

    Thanks so much for the suggestion!


  • Anonymous May 11, 2010

    3 things that shut down ryobis.



    1.Fuel hose split/perished and or fuel filter broken off in tank,,simple fix.



    2. blocked exhaust by insects poke somthing in hole to clear out.



    3. carby diaphrams hard/ britle causing pump not to work and or not metering fuel..



    becarefull using compressed air on the carby too much pressure will destroy the check valve in body.



    As a starting point high and low mix screws set to 1 to 1.1/4 turn from just seated...

  • Anonymous Oct 03, 2012

    All you guys are da bomb diggity. Thanks!

  • David Revelle
    David Revelle Feb 25, 2017

    My problem is that it will start, run and throttle up when laying flat but the min I pick it up to start using it and tilt the thing it starts bogging down and stops.

  • Pieter Vleeshouwers
    Pieter Vleeshouwers Sep 22, 2018

    If you have that problem with any motor brand weedeater and more tools like chainsaws , always first thing to prevent wasting time for search is to remove 2 nuts from the muffler and remove it and take a look at the piston in the exhaust hole of the cilinder for grooves on it then you know its over if it has grooves and only one broken piston ring could be possible i think the compression is too bad, give the H adjustment counterclockwise for max a 1/4 turn Only if it was never adjusted for different fuels like alkylat or gasoline 2stroke but the gaskets in the carburetor pump menbram if it will stopped or and bad starting , IF there is a bad premix gasoline used for long time a too lean H adjustment or gasoline instead of alkylat fuel also no good l&H adjustment leaking petrol hoses there is work to do but beware for grooves in first place.

  • David halstead Apr 13, 2019

    My Ryobi 4 head motor keeps flipping upside down while running. How did you fix it?

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  • Posted on Apr 15, 2009
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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!

  • 4 more comments 
  • Awdvld1978 Aug 21, 2011

    That was what was thinking of trying nexted. My primer bublble was wore out . So I replaces it,now it will idle on full choke , but as soon as I open the choke to full run it stalls out but thanks gonna try that next.

  • Anonymous Dec 23, 2012

    Yes it was helpful. What I did was cut off a copper slotted screw head and super clue

  • Anonymous Dec 23, 2012

    Continue, it to the adjusting screws. It work fine, Motor running great.

  • Rudy Gomez Jul 27, 2013

    Great answers! I found the PacMan adjusting tool on Amazon for $10, followed directions and now my SS30 runs like new!

  • Rudy Gomez Jul 27, 2013

    Thanks for the answers. I found Ryobi PacMan adjusting tool on Amazon for $10, followed directions, and now my SS30 is running like new!

  • john smith
    john smith Mar 31, 2018

    No dremel available, so I used a junior hacksaw to carefully cut slots through the housing and adjuster heads....was ready to spend over 100 quid on a new multi-tool...thanks for the info !

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  • Posted on Jun 02, 2010
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My weedeater started to kill while operating. The idle and run were fine. It kills like I hit the stop switch. I pull once and it starts right up then kills 30 seconds later. Any ideas on this.

  • Anonymous Jan 06, 2013

    Try turning (L) srew counter clock wise Half turn more gas, let it idle when it's wram up.

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  • Posted on May 09, 2009
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My CS30 that I just bought worked fine the first time I used it. It sat in the shed for maybe 2 weeks and when I tried to start it I had the same problems as nimmote wrote about. I wanted to use his suggestion to adjust the H and L jets on the carb, but didn't want to dremel out the guard and screws (in case I needed to return it). I tried several things to try and fit around those sloted adjustment screws and found that a 3/8" copper Watts "All-Tube" Nut Sleeve & Insert (that can be found in any hardware stores plumbing section) was the best. You simply pull out the insert and tap it onto one of the screws. I first tapped it on the H screw using a small hammer and keep in mind that the first time you have to use enough force to mold the copper mold around the screw, but once it is on there it is easily removed and placed on the L screw. Just look inside the insert and you can see a notch where it has been recessed around the screw slot. You line that notch up with the slot on the other screw and it slides on by hand. You can then use needle nose pliers to adjust either screw as nimmote described.
Now my CS30 runs like a champ!
In my case I had to turn the L screw about 1/2 turn CW to reduce air flow at idle and the H screw a 1/4 turn CCW to let in more fuel at full throttle. My understanding is the L screw is a needle valve that controls how much air is allowed in the carb and the H screw is a needle valve that controls how much fuel is allowed in the carb. Anyways hope this helps someone, it is absurd that they are not sloted screws that the end user is allowed to adjust...

  • Anonymous Jan 06, 2013

    Removed both screws L and H and use a hack saw to cut a slot for a slotted srew driver. Put the screws back in all the way and back off counter clock wise one and half turn, start it up till warm and make you adjustments. Good luck

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  • Posted on Jun 20, 2009
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Thanks for the advice, it worked. I had the identicle problem as describes (would start, but wouldn't idle and as soon as I gave it gas or moved into the B or C position it would die out)...The one thing I did differently was that I was able to slightly turn the L screw (white/clear casing) a half turn counter clockwise without removing it (there is a slot that a flat head will work on without removing the white casing and the screw will actually turn) and then I used a pair of plyers to pull off the red casing (H screw) completely as there is no way to turn the screw with a screwdriver with the casing on. Once I pulled the red casing off, I used a small flat head to also turn the H screw a half turn counter clockwise. Started it up and it idles well and runs well. Thanks for the advice. I would have had no idea otherwise.

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  • Posted on Jun 18, 2009
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You can thank the EPA for all of these mixture-limiting BS contrivances.
The first thing I do on any engine that comes in for repair is to remove all of the limiters, then the mixtures can be adjusted correctly, according to the conditions needed for proper operation, and not conditions mandated by the EPA.

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  • Posted on Mar 27, 2010
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My weedeater is impossible to start.Any suggestions

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  • Posted on May 10, 2010
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Before you start touching the plastic covers on the fuel mixture screws make sure they are factory set and then move on to other fixes. These plastic set screws should be set that they touch one another flat faced. there is a cam type lobe on these plastic covers. Use needle nose pliers to turn them slightly towards each other (perpendicular) if you don't have the correct screwdriver.

  • Anonymous Jul 18, 2011

    Search eBay for part number 530035560
    That would be the Splined Carb Tool you need.
    You can get one shipped for less than ten bucks, even an actual OEM part (not after market).
    JoJoCamel

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  • Posted on Jul 27, 2013
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Thanks for answers. I ordered Ryobi PacMan adjusting tool on Amazon or $10, followed directions and now my SS30 is running like new!

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  • Posted on Jul 26, 2010
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I have a ryobi weed eater engine, it just wont start, i cleaned everything, it dropped before but i doubt thats the problem, i messed with the l and h screws a little but i dont know what to do, and answers? if so email me at [email protected]

  • tinker728 Jul 30, 2011

    I dremeled both screws and just had to hold the trigger while turning each one a little at a time and it works great now! thanks all for the input.

  • Anonymous Jan 02, 2013

    I took out the l and H adjusting screws and cut a slot with the hacksaw for a slotted screw driver. Now my Ryobi is runnning like new.When screwing screws back in, screw it all the way in, back off counter clockwise 1 1/2 turn on both screws, try starting, when it's starts adjust L screw first than the H with throttle open. good luck My weed eater is running like brand new.

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  • Posted on Apr 09, 2021
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You have to adjust the high and low idle screws on the carburetor which is difficult without a special tool. I have the old CS26 weed trimmer and it has had a hard time for a while now on high, stalling out frequently. I had replaced the fuel lines a year or two back but don't use it much as we have a lawn service. I dug it out this year and started working on it and after reading these comments just bought an entire new carburetor on Amazon for $16 simply because it comes with an adjustment tool. I used the tool on the existing carburetor to adjust the high idle screw and it works great now. Horrible design not to have those screw slotted. Just horrible. Spending 16$ is better than paying over a hundred for a new trimmer though. Amazing how cheap these sorts of things are now online.

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  • Posted on Jun 02, 2016
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My idle was set too high. I had all the same problems you all describe, turned the idle down until it nearly died then turned it up a quarter turn. Runs perfect and most of the time will start without choking it.

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You can get the tool on ebay. There are several types. Most Ryobi's use the "pac-man" named such because of the shape of the head.

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  • Posted on Jun 07, 2010
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