![]() Start the trimmer (using the choke lever and starting instructions as noted on the start label). The owner of said small engine has to take control to achieve the proper air/fuel ratio. purely mechanical settings control air/fuel ratio. Parenthetically, here is where small engines differ profoundly from the computer controlled engines we generally use, like those now found in cars. Now turn out the needle one and one half turn. Fit the tool over the spline of one of the needle screws and turn in the screw clockwise until seated. The high and low adjustment needle screws are viewed looking at the carb from the shaft end of the motor. Tool in hand, remove the carb intake cover. Fresh clean gasoline, no broken fuel lines, etc. The instructions below assume that you have a functional carb and an engine that has compression and spark. (No connection with this vendor, other than a very satisfied customer) You'll need the "pac man" tool to fit the Ryobi carb adjustment screws. I got a set of four, but you could order just the one you desire. I found my set of carb tools on ebay from the vendor: Randy's Engine Repair. Second, to adjust the carb, you must first acquire the proper tool. OK, here are some of the particulars: First let me say that I still haven't figured out why these trimmers don't have an actual air filter. If anyone wants more details on adjusting the carbs on these, just ping back and I will post more details. It is sad that consumers are challenged by these barely running small engines. The edger works REALLY hard, and is humming along fine. I use one as a string trimmer, and another as an edger. I also changed out the crankcase oil (thin grey stuff) with automotive 15w40. Once the carb air/fuel ratios were adjusted for proper running (not emissions), both of the trimmers run great. Happily, I already had the proper carb adjustment tool, and also happily, the carb on the c430 is adjustable. Also, owners are well advised to purchase the necessary "secret" carb adjusting tools. It's sad, but nowadays one has to know some of the secret handshakes to get trimmer motors to run properly, as the carbs are set to pass emission requirements. And indeed, when at the home shop, both would start but not run at full throttle. (I picked them up at a garage sale, the owner saying that they would not run at full throttle). I would strongly recommend against buying the current Roybi s430 model and that probably goes for the c430 model too since they both have the same motor.įor what it is worth, I also own a couple of these Ryobi c430 four cycle trimmers. ![]() It has about 1cc less on the engine and 1" less on the cutting swatch but most importantly it works. I went off to Lowe's and bought a Troy Bilt 4 Cycle. Ryobi, if you read these forums about your products, go back to the drawing board with the s430 as they're junk. So off I went back to Home Depot, and got a refund. This was quite uncomfortable as it rotates the trimmer in my hand when it refires again. The replacement would run at full throttle but developed a misfire which was more like a hiccup where the engine stopped and then immediately fired again. ![]() ![]() I used it for about an hour and then crankcase oil started leaking out of the air filter (quite a lot) and the misfire came back. After about 5 mins the misfire went away. Got it home, when it started up it was misfiring when I first started it after assembly. I took the new one that wouldn't run at full throttle without dying back to Home Depot and exchanged it for another s430.
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