My Ryobi C430 stalls when I try to give it gas. It idles fine though.

SOURCE: My Ryobi weedeater engine keeps stalling out.

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!

panilling9

• 284 Answers
• Posted on Jun 07, 2009

SOURCE: Ryobi 790r trimmer has low power and stalls

Maybe a quick fix and maybe not
check your muffler the factory puts a spark arrestor screen that tends to plug after awhile
there is a little plate on the side muffler that needs to be removed to access the screen you may need a torx bit or allen wrench to remove
you may have to remove the back half of the plastic cover to access the screws
remove screen and clean with carb. cleaner or equivalent make sure you can see through it and reverse the procedure to put it back

SOURCE: My Ryobi weed trimmer is easy to start and idles

If you have a spark arrester fitted, it will be blocked with carbon preventing the exhaust gases leaving. It will be behind a plate bolted to the exhaust silencer/muffler. Scrape the carbon off the wire mesh carefully, until you can see through the mesh again.

SOURCE: ryobi gas blower idles fine when i push the

some carbs are not adjustable,check your air filter first to make sure its not rescricted and also a new plug,make sure your fuel is fresh,now if you do have adjusting screws,most have plastic caps on them with preset adjustments locked in,you will have to remove these caps to adjust,they need not be reinstalled,Hope this helps

SOURCE: there is no air filter on my Ryobi c430 grass

I had a number of customers tell me that they bought this model at LOwes and had the same answer from them. I think its a planned failure on Ryobi's part. Their reply to me was that they dont need one because they work in a clean environment. I find this to be a stupid answer, I would recommend that you buy an airfilter for an older model that used the donut foam filter and slice it in half to fit in the housing without crushing it and imbeding the air flow, this will help tremendously. Good luck. MY advice from 44 years as a small engine engineer is to buy a name brand product from a company that stands behind them, and never sells them in a box..