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Wed, Jul 6, 11 at 18:06
| This carb is on a Ryobi CS30-30" Trimmer. 2007 model. Hard to find parts for this Walbro look-alike. So I put Walbro parts in it. New fuel lines and filter, new purge bulb check valve, new on-the-carb purge bulb, new metering and pump gaskets and diaphragms. And a new needle valve. Metering lever is just below the TOP of the body. It will run, but smokes badly and BLOWS fuel out of the carburetor. Using the throttle or adjusting the mixture screws has no consequence. Of course, it eventually loads up with fuel and dies, but will run that way a few minutes. The vent in the cap is clear, but the tank pressurizes some during purgeing. Ok guys, what did I miss and How can I "unflood" this thing? |
Follow-Up Postings:
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- Posted by rosemallow z7 Md (My Page) on Fri, Jul 8, 11 at 6:11
| I found this in my Zama Manual The other possible failure mode is leaking. If the Simple Start pump does not shut off or if the outlet check valve becomes damaged the system will leak fuel and affect the carburetor mixture settings. 1) Is the pulse being shut off? It takes a very small amount of pulse to operate the pump. Make certain the levers controlling the simple start pulse are correctly positioned to completely shut off the pulse in the run mode. 2) Is the outlet check valve working? Again test the outlet check valve with a piece of primer hose. Gently blow through the check valve by month or with a carburetor pressure tester. The outlet check valve should offer resistance to airflow. If the outlet check valve is sticking open, it can be cleaned with a spray carburetor cleaner. If cleaning does not fix it, replace the start pump body. Also there is a setting for the float,which is tricky. |
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- Posted by homegrown55 9 (My Page) on Fri, Jul 8, 11 at 15:56
| I have read the Zama tech guide and seen the probable causes for a flooding carb. I don't think the Ruiing carb is like the Zama carb with the Simple Start System. I did not find the welch plug leaking, but I do think the main nozzle check valve may be stuck or damaged, but that doesn't normally cause severe flooding. I understand that a main nozzle check valve that is leaking can cause the engine to die lean at an idle. I am going to recheck the metering lever height and the positioning of the metering lever diaphragm. |
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- Posted by homegrown55 9 (My Page) on Sun, Jul 17, 11 at 13:57
| I would like to first THANK everyone for their LACK of input on this matter (except you Rosemallow, thank you indeed). I KNOW this is a problem a lot of users face. Don't be afraid of the Ruiing carb. It is manufactured in China under the exact strict quality control standards as Zama and Walbro. I have seen photos of their facility and spoken via email to one of their courteous sales-reps. What you don't know (fellow forumers) I will tell you. First, the carb main body is identical to a Zama, ports and all. I am sure there are at least 2 different models of this Ruiing carb. The one on this 2007 Ryobi had NO CHOKE, (as it was used in conjuntion with the infamous,filterless Ryobi Roto-Choke). The latest other one I have seen was installed on a newer 2009 30cc 4-Stroke Ryobi Trimmer which had a Simple-Start setup (just like Zama)used on some of the C1Q and C1U model carbs. But, I regress. I had the L and H mixture screws on the 2007 Ruiing carburetor adjusted WRONG because when I went to seat them lightly, I felt much resistance and assumed I was there. They were NOT there. So the 1.5 out setting on the mixture screws was skewed and the carb was set very rich, thus the fuel spitting out the carb and flooding the crankcase. This was my fault. Today, I got the settings right, except after running like it should for about 15 seconds, it would die. This is with a new primer check valve, a new needle, a new fuel pump,but,I decided to install a "used" Ruiing metering diaphragm off of the model with the Simple-Start setup. A Ruiing diaphragm's metering lever rivet is wider, but about the same depth as Zama. The Walbro ( from DAT 10 Kit) metering diaphragm lever-side rivet is longer and can lead to an open needle if used on a Ruiing. So there ya go, sports fans. So folks, don't be afraid of these carbs. They are not inferior, they just have a lack or carb kits for them available, but you can match them with Walbro and Zama. The needle valve in the Ruiing is an exact match to an 82-82 Walbro needle valve, as is the purge/primer bulb check valve. But, I find ( and the sales rep explained this ) that the main carb body gaskets and diaphragms are copies of Zama product. So again, thanks for all the non-input, from you so-called carb experts. I hope you walk away from this one knowing a LOT more than you did prior, because I expected more input from you on this matter than you showed. |
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- Posted by homegrown55 9 (My Page) on Mon, Jul 18, 11 at 15:21
| For those that care about the outcome, or want to work on those Ruiings...I tweaked the L and H mixture screws some more, checked the integrity of the 2 year old metering diaphragm. I then checked over all bolts and gaskets for any possible leaks. This little 30cc machine is NOW running like no tomorrow! It pops first pull when choked, and then starts running first pull off of choke immediately thereafter. Can't do better than that. I do realize that sometimes you get lucky but I have been fooling with this thing for quite sometime. It runs great, has lots of power and shows that even WITHOUT a factory rebuild kit, these things can be made to run! There is an identical unit just like it arrived on my work bench today for repair (it's my hobby). Oh yeah! (patience is a virtue here) |
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| This is my first encounter with the ruiiing carb but I appreciate all the input from homegrown55 concerning comparisons to Zama & Walbro.I'm working on a Ryobi S430 today and will certainly utilize this valuable information. Thanks again !!! |
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- Posted by homegrown55 9 (My Page) on Sun, Jun 3, 12 at 15:50
| Jerrymc.....that is why we are here I presume...to live and learn. May I wish you great success in your endeavors with these diaphragm carburetors. They are VERY temperamental.Oh, and never use ANY strong solvents or high PSI compressed air on them as you can EASILY damage the sensitive little check-valves within making the carb malfunction and NOT work properly! |
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| Any problem with a Ryobi is usually easy to fix. Throw or give it away. |
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