e screw all the way in and out doesnt fix anything. i do not have an air filter in it. could that be the problem? I am also using a gas mix that is the same for my chainsaw. could that be the problem? getting very irritated with it and ready to just toss it in the trash.
30 Cubic Centimeter Curved Shaft Gas Trimmer

Experienced gardeners share their insights in answering this question :
Hi there,
The problem is that the diaphame in the carb. is worn-out and you need to replace that.It is very important that you run your machine with a air filter as the small particals can damage the diaphrame.Also remember that the older machines run on a mix of 30 to 1 and the new machines run on a 25 to 1 mix.
Trust that this will solve your problem
Regards
Edu

How to Identify and Fix Common Gardening Problems ?

We provide a variety of viewpoints on how to identify and fix common gardening problems. Our sources include academic articles, blog posts, and personal essays from experienced gardeners :

A clogged carburetor is most commonly caused by leaving fuel in the string trimmer for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to stall.
The air filter may be clogged. If the air filter is clogged, the engine will get too much fuel and not enough air. As a result, the engine may not start. If the air filter is clogged, replace it.
If your RYOBI Edger isn`t starting: For 18V or 36V Battery models: check the battery has charge by pressing the fuel gauge. For AC models: turn the power point switch off and check the cord is inserted correctly in the extension lead. Use a heavy-duty extension lead no longer than 25m for optimal performance.
Ryobi Trimmer (2 Pack) Replacement Champion RY4C Spark Plug # 870301002-2PK.
Over time, the spark arrestor can become clogged with soot. If the spark arrestor is clogged, the edger may stall or run roughly. To unclog the spark arrestor, remove it and clean it with a wire brush. You can also replace the spark arrestor.
If the engine is not revving up and cuts out before you reach higher revs then you need to do the following checks: Fuel: Make sure it is fresh and correctly mixed (see `Starting Issues`). Air filter: Make sure it is clean and unclogged. Fuel cap: Make sure it`s hand-tight.
The most common problem with a strimmer not starting is that there`s a problem with the fuel mix. Double check that you`ve used 40 parts fresh unleaded petrol to 1 part 2-stroke oil (40:1). Check the petrol you`ve used isn`t stale.
Clean the Exhaust Spark Arrestor Screen

As with plug fouling, too much oil in the gasoline, inferior oil, a dirty air filter and/or continued operation at less than full throttle will plug the screen with carbon deposits. This prevents exhaust gas flow, which leads to power loss.

A blocked or dirty fuel filter

If your engine is trying to run, or starts and quickly stops, you might want to do a quick air filter check. You need air for your initial spark – and if oxygen cannot move readily through the system you will have problems both starting and keeping your whipper snipper running.

If the trimmer engine runs, but the trimmer head does not spin when the throttle is engaged, the clutch may be broken. The clutch prompts the drive shaft to start rotating once a certain rotational speed is reached and allows the engine to run without always rotating the drive shaft.
With the RYOBI 4 Cycle string trimmer, you no longer have to worry about mixing gas and oil. This innovative unit is attachment capable, accepting all nine of the Expand-It universal outdoor attachments.
oz 4-Cycle 20W-50 Oil.
Tool Warranty: All RYOBI 40V Lithium-Ion Outdoor Tools are covered by a 5-Year Limited Warranty. Battery & Charger Warranty: All RYOBI 40V Lithium-Ion Outdoor Batteries and Chargers are covered by a 3-Year Limited Warranty.
When your trimmer starts and runs on choke, it could be because the check valve in the gas cap is clogged. Start the trimmer and gently unscrew the gas cap halfway off. Turn the choke off and assess. If the engine is still running, that means the gas cap may be the culprit.
Storing regular petrol inside a machine can cause blockages and gumming to the intricate fuel delivery parts, so the most important thing to remember is that whether you`re storing a chainsaw or garden power tool such as a petrol lawn mower you should store your tool without any fuel in it.
Usually this is the result of the cutting head being taken too close to objects, e.g. garden stones, paving edges, walls etc. The cutting line must be allowed to rotate freely and the correct diameter and type of line should be used.
The most common problem with a strimmer not starting is that there`s a problem with the fuel mix. Double check that you`ve used 40 parts fresh unleaded petrol to 1 part 2-stroke oil (40:1). Check the petrol you`ve used isn`t stale.
The most common problem with a strimmer not starting is that there`s a problem with the fuel mix. Double check that you`ve used 40 parts fresh unleaded petrol to 1 part 2-stroke oil (40:1). Check the petrol you`ve used isn`t stale.

Discover Relevant Questions and Answers for Your Specific Issue

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My ryobi bc30 starts but will not stay running. I only see one screw for the carb but it dont seem like it adjusts anything. I have turned the screw all the way in and out doesnt fix anything. i do not have an air filter in it. could that be the problem? I am also using a gas mix that is the same for my chainsaw. could that be the problem? getting very irritated with it and ready to just toss it in the trash.
ANSWER : Hi there,
The problem is that the diaphame in the carb. is worn-out and you need to replace that.It is very important that you run your machine with a air filter as the small particals can damage the diaphrame.Also remember that the older machines run on a mix of 30 to 1 and the new machines run on a 25 to 1 mix.
Trust that this will solve your problem
Regards
Edu

Do you mix gas and oil in this trimmer – Ryobi 30 Cubic Centimeter Curved Shaft Gas Trimmer
ANSWER : Yes. Verifythe ratio, either 40:1 or 50:1

My rcs5335s engine starts but wont keep running, its starts ok but fizzels out after a few seconds
ANSWER : May have to do carb adjustment

Ryobi cs 30 why does the trim head turn on its own after started when I haven’t touched the throttle !!
ANSWER : Start with adjusting the carb low and high out 1 full turn, then adjust the idle.

Have a craftsman 16″ chain saw 358.360260. Could not initially get it started after it had sat for a couple years with fuel stabilizer in it. When I went to use it the fuel had all evaporated and the fuel pick line was rotted. I replaced that with some difficulty but finally got it on. Saw still wouldn’t start. Replaced the fuel filter. Still wouldn’t start. Pulled the carb apart and cleaned and recleaned everything. Diaphragms were good and I didn’t adjust any of the mixture screws because as I said it ran fine before storage. Non of the carb passages were clogged. Fresh gas 40:1, good spark plug and good spark. Airfilter is good. Engine has maybe about 4 hours of total run time on it. It’s a ZAMA (?) carb. It will run for about 30 seconds when I manually prime it by pouring a small amount of fuel directly though the carb. When I was disassembling the carb the vent hose that goes back into the fuel tank seemed to have a small out of ?substance? in it which I cleaned out. It was right at the end the of the hose that goes back into the fuel tank and not up by the carb. It didn’t appear to be like your typical gummy deposits/varnish though. I hope it wasn?t some type of spongy check valve stuff that is supposed to be in there. That might explain some of my problems. Anyway, I also can not seem to get the primer bulb to fill. When I open the fuel tank, look in side and depress the primer bulb, air bubbles come out of the fuel filter. But when I let the bulb reexpand there’s no fuel that gets sucked up the hose. I can however seem to fill the primer bulb when the fuel tank is full and the chainsaw is laying on it?s pull cord side and the bulb is depressed a bunch of times. The saw will also start and run again for about 15 seconds then die. It’s definitely not getting/fuel and probably running out . Thanks.

Carb screws need adjusted i need to know the settings
ANSWER : Hi. Lightly seat the low screw and bring it out one and a quarter turns. Lightly seat the high and bring it out one turn. Adjust idle screw to suit. Regards Phil.

Im having trouble starting my 2 stroke chainsaw. I follow the instructions but it wont fire over it sounds like its just about to but wont.
ANSWER : Here is a Link to one of my Tips:http://www.fixya.com/support/r6081405-cleaning_small_engie_carburetorGood Luck!Jim

I have a husqvarna 323L string trimmer. I stored it after running the tank & carb dry for about two years. I fueled it, then started it, & it ran for a minute then died like I turned the switch off. Since it would not restart, I found the fuel filter had broken off the hardened fuel line & it sucked gummy crap out of the tank & into the carb. Failing at cleaning the carb, I finally put a new carb on it & replaced the pump, hoses & filter. It has ran good till this year. I winterized it with stabilizer & left it with a full tank over the winter. The gas in the tank was gone when I got ready to use it this year. I filled the tank with premix, checked for leaks, then started it. It would run fine for about half a tank, start idling poorly (lean) then cutoff & refuse to restart till I refilled the tank. I finally found the tank had cracks & was letting pressure out of the tank & apparently this was causing the carb to lose it’s ability to siphon gas out of the tank. So I replaced the tank which came with new hoses & a filter, which I properly installed to the carb. It cranked right up, but when it runs a half tank, the carb quits sucking gas out of the tank. When I pump to prime the carb, it moves the fuel into the carb, but the pump never gets hard like it does when I prime the carb when the motor is cold. I have to keep refilling the tank, prime, & then it starts & runs until the tank gets about half empty. The new fuel filter is down in the gas tank properly, but It will not run after it shuts off until I refill the tank & prime. I’m baffled. New tank, new hoses, new filter, new carb, & I can find no leaks in the fuel system. It runs strong. The 323L is a two-stroke & it always cranks on the second pull from cold on a full tank. Any ideas?