Echo SRM225 Only Runs On Choke [Solved]

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Many people are facing this issue with their Echo string trimmer which only runs when the choke is on.

If you are the one then, in this repair guide I’ve listed some common problems and their solutions that could help you to fix your Echo string trimmer and it will start running in its normal mode when the choke is off.

So without further ados let’s get started…

Echos Srm 225 is a very popular string trimmer that comes with robust start technology which makes it very easy to start without much effort but with the passage of time and improper maintenance, its internal parts create problems.

Although some problems can be solved easily, on your own, some major problems need the help of an expert.

Reasons For Echo SRM225 Only Running When The Choke Is On

There can be many reasons why the Echo SRM 225 does not run when the choke is off.

First, let’s take a look on

How Does The Echo SRM225 Choke Works?

Choke in an Echo SRM225 works as a plate in the carburetor that mixes the air and fuel and supplies this mixture in its carburetor. The mixture of fuel and air is burned inside the engine and produces a large amount of energy. The choke of the Echo string trimmer comes with an on/off button. By default, the choke is on and it prevents the supply of air inside the carburetor and creates a vacuum in the chamber.

The choke is useful to start the cold engine. When the engine is cold it requires an adequate amount of fuel supply to get warmed. Here choke limits the supply of air into the chamber and helps to warm up the engine.

A temperature-sensing spring monitors the internal temperature and when require it closes the choke plate to regulate the required amount of air inside the engine to maintain its temperature.

What Happened When The Echo SRM225 Runs When The Choke Is On?

If your Echo string trimmer only runs when the choke is on that means your engine is not getting an adequate supply of the mixture of fuel and air.

Echo SRM225

Disadvantages of Running The Echo SRM225 With The Choke On

  • Fuel consumption is increased.
  • The performance of the engine can be reduced.
  • Your Echo Trimmer engine can be damaged.

Also Read: Weed Eater Stalls When Given Throttle [Solved]

5 Easy Solutions of Echo SRM225 Runs Only When The Choke is On

1. Check The Choke Plate

When the engine is cold its choke plate is normally on. Remove the cap and here you will find an air filter, after removing this you will see two screws. Remove them by using a 27I screwdriver.

Now Remove the plastic seal with your hand. In most cases when you use the Echo string trimmer for a long time its choke plate creates problems. Just replace it with the new one.

2. Change The Fuel Line And Fuel Filter

Fuel flow through the fuel line that is connected to the carburetor. It manages the quantity of fuel that the engine should get. Sometimes it needs replacement because in most cases when the engine doesn’t get enough supply of fuel then the problem arises.

With the passage of time, the fuel filter gets clogged. You will find the fuel filter in the small fuel tank. Just open its cap and remove it with your hand and replace it with the new one.

Your problem of Echo SRM 225 running only when the choke is on can be solved if the fuel filter gets useless.

3. Clean The Air Filter

Sometimes air filter gets clogged from dust and debris and this may be one reason for your problem. Check it by opening the cap and simply removing the air filter with your hand.

For cleaning the air filter simply throw the air with pressure on it and all the dust particles get cleaned. Now assemble it and check if your problem is solved or not.

4. Check The Carburetor

Due to dust and debris, the carburetor needs to clean well. For this, you have to remove the carburetor from the Trimmer. Check all the seals and ensure that the carburetor is in good condition. If it got damaged then replace it with the new one.

Tools required to remove the carburetor from the Echo SRM225 trimmer

The maintenance kit comes with all the tools:

  1. Spark plug
  2. Carburetor
  3. 2 mounting gasket
  4. 2 Primer bulb
  5. Air filter
  6. Fuel filter
  7. 3 fuel lines
  8. Grommet
  9. Vent

First, you need to remove the air filter cover and it is very easy to remove it. After that, there are two screws that can be removed by using any T25-compatible screwdriver.

After removing the plastic case you will see that the whole carburetor assembly comes out. Now to remove the carburetor you just remove its throttle cable by using a wrench tool (maybe 10mm).

Now remove the all outlet connectors by using your hand. Now you have successfully removed the old carburetor from the machine. Look at the gasket and remove it gently by using your finger and peel it off.

Now replace the old gasket with the new one. It’s not look alike the original one but it works. Now take the new carburetor and assemble the whole unit as you removed the old assembly.

You may find it difficult to attach the throttle cable. I give you the simplest way to do so.

Check a little hole at the end of the moving screw. Now align the screw gap with the hole and place the throttle cable inside it and move it toward the bulb and tighten its screw with the wrench and that’s it.

5. Take The Expert Help

If all the above-listed methods do not work, it means it has some kind of serious problem and it needs the help of an expert. Maybe the problem is inside the engine assembly (piston, etc). If your Echo SRM225 trimmer is old then such type of repair costs you much higher and it would be better to buy a new grass trimmer for your Lawn.


I hope this article helps you to fix this issue with your Echo SRM225. I have tried to give some genuine solutions that actually work, still, your Echo string trimmer won’t start off choking and then need the help of an expert otherwise buy a new one.

Helpful Links:

Echo SRM225 technical document

About The Author


Adam is here, I'm an Editor and writer on guidingpapa. I love to share home improvement tips and new ideas in this blog. I have been doing this from couple of years and I'm very passionate about it.

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