Ryobi 2 Cycle Trimmer Won’t Start: Common Problems and Solutions

Weed Eater Tips & Tricks

ryobi 2 cycle trimmer won't start
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Maintaining gardens and yards may just be a side interest to a few, yet to other people, it is an unquestionable requirement.

Yards are challenging to keep up, especially large ones.

Also, when weeds have grown out of your garden, they will make your yard look filthy and chaotic, just as the natural surroundings of new vermin.

Owning a Ryobi Weed Eater is an absolute necessity, but what if your Ryobi 2 Cycle Trimmer won't start?

We have the answers for you, and we'll make you understand why a Ryobi Weed Eater is a good product to own.

What Is a Weed Eater?

As mentioned, a weed eater is important for families who need to keep up their yards or remove the weeds in their general vicinity.

Weed eaters can trim an entire yard for around six hours and can also assist the older or people with any back issues.

The Ryobi Weed Trimmer

Ryobi RY34427 25.4 cc 2-Cycle Full Crank Curved Shaft Gas String Trimmer
  • This refurbished product is tested and certified to look and work like new. The refurbishing process includes functionality testing, basic cleaning, inspection, and repackaging. The product ships with all relevant accessories, and may arrive in a generic box

Ryobi is one of the best weed trimmers yet affordable.

It comes with a 26-cc, two-cycle engine with low emission, which is good not only for our health but also for the environment.

It boasts its one horsepower and two-piston rings for overall maximum increase in power, which makes work easier and faster.

You can also change the Ryobi Weed Trimmer's attachment so that you can use one that is appropriate for the task at hand.

You can even use attachments manufactured by other companies.

When you use it, it can cover an entire area for about 10 hours, plus with its StartEasy flip button, you do not need to pull it much to open its engine.

It has simple parts, is easy to maintain and store, and has less vibration.

The problem with the Ryobi Weed Trimmer is the loud noise its engine produces, which you would expect from gas-powered trimmers.

The fuel economy of the Ryobi Weed Trimmer is also not that efficient compared to a four-cycle engine model.

Ryobi 2 Cycle Trimmer Won’t Start: Things You Can Do

If you have problems getting your Ryobi 2-Cycle Weed Trimmer to start, there may be some faulty things that you can find on its interior.

Usual problems that you will encounter may involve the spark plug, carburetor, fuel and air filters, and recoil and rewind pulleys.

Here are solutions to some of the most common causes of why your trimmer won't start:

1. Replace the Spark Plug

Check the plug where the Ryobi 2-Cycle Trimmer is attached to if there are any damages.

If the porcelain insulator at its back has cracks, a part or the whole electrode has burns or damages, or any carbon built up around the electrode, you must replace the spark plug immediately.

A spark plug tester can also be used to test the defectiveness of the spark plug.

When the engines are cranking, a bright spark can be seen between the plug tester’s terminals.

A spark plug is defective if no bright sparks are seen.

If there is a problem, find the spark plug that fits your Ryobi 2-Cycle Trimmer, and replace it.

You can usually find the proper size in the user manual.

2. Clean, Repair, or Replace the Carburetor

When your Ryobi 2-Cycle Trimmer has not been used for a while, the remaining fuel may clog the carburetor and prevent the start of the engine.

That is because the chemicals on the fuel may evaporate through time, which will make the fuel more viscous and stickier.

You can unclog it using a carburetor cleaner or just replace it with another if cleaning cannot solve the problem.

If you think the carburetor damages are still fixable, you can use a carburetor repair kit.

It has items that you can use to repair the damages, especially if they are worn out, warped, or clogged with fuel.

It contains reed and needle valves, a primer bulb, springs, diaphragms, and other parts that may be damaged.

3. Check and Replace the Recoil Starter

A recoil starter of a weed trimmer triggers the crankshaft to start the engine.

If the recoil starter assembly is not working, the engine will not start.

Inspect the assembly for any possible damages by removing it first.

When you pull the starter rope, the tabs extending from the cam and pulley should grab the engine hub, causing the engine to turn.

If you release the rope, the tabs and rope should go back to their original positions.

If the whole recoil starter assembly is not working, buy a new one to replace it.

The recoil starter assembly you need to buy should properly fit your particular weed trimmer.

Having a wrong fit will not allow your engine to start.

4. Replace the Recoil Starter Pulley

The recoil starter pulley is the part of the Ryobi Weed Trimmer that winds up the starter rope whenever it is not in use.

If the recoil pulley has the wrong arrangement, stuck, or damaged, it cannot rewind the starter rope up, so the engine will not start.

If the recoil starter pulley is damaged or broken, buy another one then replace it.

Make sure you find the appropriate recoil starter pulley for your weed trimmer.

Buying and using an improper recoil starter pulley will stop you from using the starter rope effectively.

5. Replace the Rewind Pulley and Spring

If your Ryobi trimmer fails to start, it might have a broken rewind spring.

The rewind spring goes back to the rewind pulley when the starter rope is pulled and released.

If part of the rewind spring is broken, the rope won't recoil back to the pulley, which will prevent the engine from starting.

For this, you need to replace the rewind springs. Replacing the spring is possible, but it is a lot easier just to buy a new rewind pulley and spring assembly.

You need to find the proper rewind pulley and spring set-up from the store so that it can fit and work properly with your weed trimmer.

Randomly buying one will waste your effort and money since it will not work with your specific weed trimmer.

6. Replace the Fuel Filter

The same as a carburetor, if a string trimmer is not used for an extended period, fuel may clog the fuel filter because some of the chemicals from the fuel may evaporate, leaving the fuel sticky and more viscous.

To solve this issue, drain the old, remaining fuel from the fuel tank and then replace the fuel filter.

Avoid using the fuel filter you had used since it may not work as before when it was new and just use what you have bought.

7. Clean or Replace the Spark Arrestor

A spark arrestor is a small filter-like screen that prevents the engine from emitting any sparks.

It can accumulate soot over time if not monitored occasionally, and that may cause clogging.

If the spark arrestor gets clogged, the engine may not start.

You will need a wire brush to unclog the spark arrestor, but first, you have to remove it and then clean it.

After cleaning the spark arrestor, you can check if it can still function properly for the engine to start.

If no further cleaning can resolve the clogging problem, you may need to replace it with a new one.

8. Replace the Air Filter

The air filter of the weed trimmer can also get clogged.

If the air filter is clogged, air may not enter the tool.

Overheating may also happen, and the engine may not start due to too much fuel.

For this issue, you need to replace the air filter immediately.

The air filter you should buy should fit the weed trimmer, and you can find the recommended specs on the user manual.


Above are some tips you can try if you are having problems with your gas-fueled trimmer.

Following the solutions listed above is not essential for you to do, but these are helpful pieces of advice.

The types of problems may vary, so knowing what the right kind of solution to use is essential.

That said, the roots of your weed trimmer’s problem might be different from what was listed above.

The tips written above are just a list of guides that you can follow when you have encountered problems, such as:

  • a dirty or cracked spark plug,
  • improper venting of the gas tank cap,
  • a faulty magneto,
  • gum deposits clogging the carburetor due to gas left in the tank over winter,
  • a blocked fuel filter which will prevent the engine from starting,
  • a dirty air filter that can cause overheating,
  • a stuck valve in the primer bulb or a leaking bulb,
  • a worn diaphragm or pump in the carburetor,
  • and a blocked spark arrestor screen, which can cause the clogging of excess soot.

Try to evaluate why your Ryobi 2 Cycle Trimmer won't start and fix accordingly.

If you can't find the issue you're dealing with on this guide, then, it is best to contact the manufacturer to guide you.

It is also best not to try any manual changes yourself and have a professional check on it if you have no prior knowledge of fixing it.

About the Author

Steve has been gardening for over 20 years now. He enjoys sharing his experiences with others.

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