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How to fix a stihl concrete saw

Mark Stevens

July 10, 2018

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Is your Stihl concrete saw not working properly? Don’t worry, we’re here to help you fix it! Stihl concrete saws are reliable and powerful tools, but like any mechanical equipment, they may encounter issues over time. In this article, we will guide you through some common problems that can occur with Stihl concrete saws and provide step-by-step instructions on how to fix them.

Identify the problem: Before beginning any repairs, it is essential to identify the specific problem with your Stihl concrete saw. Is it not starting? Is it running rough? Is there a strange noise? By pinpointing the issue, you can focus your efforts on the correct solution.

Check the fuel and oil: One of the most common reasons for a concrete saw to malfunction is improper fuel or oil mixture. Ensure that you are using the correct fuel and oil ratio as recommended by Stihl. If the mixture is incorrect, drain the fuel tank and refill it with the right combination.

Clean and replace the air filter: A clogged air filter can cause the saw’s engine to run poorly or not start at all. Remove the air filter and clean it thoroughly. If it is damaged or excessively dirty, replace it with a new one.

Inspect the spark plug: If your Stihl concrete saw is having trouble starting or is running rough, a faulty spark plug could be the culprit. Remove the spark plug and examine it for any signs of damage or wear. If necessary, clean or replace the spark plug for optimal performance.

Check the carburetor: A carburetor that is dirty or clogged can cause engine problems. Remove the carburetor and clean it with carburetor cleaner. Ensure all the jets and passages are clear of any debris. Reassemble the carburetor and reinstall it correctly.

Inspect the cutting blade: If your concrete saw is not cutting effectively, the blade may be dull or damaged. Check the blade for any chips, cracks, or uneven wear. Sharpen or replace the blade as needed.

Visit a professional: If you have followed all the troubleshooting steps and your Stihl concrete saw still doesn’t work, it may be time to seek professional assistance. Stihl has authorized service dealers who specialize in repairs and can diagnose and fix the issue for you.

By following these steps and properly maintaining your Stihl concrete saw, you can ensure its longevity and optimal performance. Remember to always prioritize safety and refer to the manufacturer’s instructions for specific guidance on maintenance and repairs.

Troubleshooting common issues

If you are experiencing problems with your Stihl concrete saw, here are some common issues you may encounter and suggestions on how to fix them:

1. Saw won’t start

If your saw refuses to start, the first thing to check is the fuel. Ensure that there is enough fresh fuel in the tank and that the fuel mixture ratio is correct. Additionally, check the spark plug for damage or fouling, and clean or replace it if necessary. If the fuel and spark plug are fine, the problem may lie with the carburetor. Clean or rebuild the carburetor to ensure proper fuel delivery.

2. Saw starts but won’t stay running

If your saw starts but stalls shortly after, the issue could be related to a clogged air filter. Remove the air filter and clean it thoroughly, or replace it if it is damaged. Another possible cause is a clogged or dirty fuel filter. Inspect the fuel filter and replace it if needed. Additionally, check the carburetor for any debris or blockages that may be affecting fuel flow.

Make sure the spark arrestor screen in the muffler is clean and not obstructed. A blocked spark arrestor can cause the saw to run poorly or not start at all.

3. Saw loses power or runs poorly

If your saw loses power or does not run smoothly, check the fuel mixture ratio. An incorrect fuel mixture can affect performance. Ensure the fuel mixture is correct according to the manufacturer’s recommendations. Additionally, inspect the air filter and clean or replace it if necessary, as a dirty air filter can hinder engine performance. If these steps do not resolve the issue, it may be necessary to clean or adjust the carburetor.

Regular maintenance, such as cleaning the air filter, replacing spark plugs, and checking fuel filters, can help prevent and resolve many common issues with Stihl concrete saws. If you are unable to resolve the problem on your own, it is recommended to consult a professional service technician.

Checking the spark plug

The spark plug is an important component of your Stihl concrete saw, as it ignites the fuel mixture in the engine to create the combustion necessary for operation. If your concrete saw is not starting or running properly, checking the spark plug should be one of the first steps in troubleshooting the issue.

Tools needed

Before proceeding with checking the spark plug, gather the following tools:

• A spark plug wrench or socket
• A clean rag or paper towel

Procedure

Follow these steps to check the spark plug:

1. Start by ensuring that the concrete saw is turned off and the spark plug wire is disconnected.
2. Locate the spark plug, which is typically situated on the side or top of the engine.
3. Use the spark plug wrench or socket to carefully remove the spark plug from the engine.
4. Inspect the spark plug for any signs of damage, such as worn electrodes, cracks, or excessive carbon build-up.
5. If the spark plug appears dirty, use the clean rag or paper towel to wipe away any debris or carbon deposits.
6. Check the gap between the spark plug electrodes using a spark plug gap tool or feeler gauge. Refer to the manufacturer’s specifications for the correct gap measurement.
7. If the spark plug is damaged or the gap is not within the recommended range, it may need to be replaced.
8. Reinstall the spark plug into the engine, making sure it is tightened securely but not over-tightened.
9. Reconnect the spark plug wire.

By regularly checking and maintaining the spark plug in your Stihl concrete saw, you can ensure proper ignition and improve overall performance. If you continue to experience issues with your concrete saw after checking the spark plug, further diagnostics may be necessary.

Cleaning the air filter

The air filter of your Stihl concrete saw plays a crucial role in keeping the engine clean and preventing dust and debris from entering. Regular cleaning of the air filter is necessary to ensure optimal performance and prolong the lifespan of the saw.

To clean the air filter, follow these steps:

1. Turn off the concrete saw and let it cool down completely before performing any maintenance.
2. Locate the air filter cover on the side of the saw. It is usually secured with screws or clips.
3. Remove the screws or unclip the cover to gain access to the air filter.
4. Take out the air filter and inspect it for dirt, dust, and debris. If the filter is heavily clogged or damaged, replace it with a new one.
5. Use a brush or compressed air to gently remove any loose dirt or debris from the filter. Be careful not to damage the filter during this process.
6. If the filter is still dirty, prepare a mixture of warm water and mild detergent. Immerse the filter in the soapy water and gently agitate it to remove stubborn dirt.
7. Rinse the filter thoroughly with clean water to remove any soap residue.
8. Allow the filter to air dry completely before reinstalling it.
9. Once the filter is dry, place it back into the air filter housing and secure the cover using the screws or clips.
10. Start the concrete saw and check for proper operation.

Regularly cleaning the air filter is essential for maintaining the performance and longevity of your Stihl concrete saw. Following these steps will help ensure that your saw operates efficiently and remains in good working condition.

Adjusting carburetor settings

If you are experiencing problems with your Stihl concrete saw, such as difficulty starting or poor performance, it may be necessary to adjust the carburetor settings. The carburetor is responsible for mixing air and fuel in the correct proportions for combustion. Incorrect carburetor settings can result in a saw that is either running too rich or too lean, which can affect its performance and longevity. Adjusting the carburetor settings can help optimize the saw’s performance and ensure it operates at its best.

Understanding the carburetor

The carburetor is a vital component of your Stihl concrete saw, and understanding its operation is key to making effective adjustments. It consists of various parts, including the air filter, throttle valve, fuel pump, and adjustment screws. The adjustment screws control the amount of fuel and air mixture, which directly affects the saw’s performance. To adjust the carburetor, you will need to locate these screws on the carburetor body.

Adjusting the carburetor settings

Before making any adjustments to the carburetor, it is essential to ensure that the saw is turned off and the engine is cool. Follow these steps to adjust the carburetor settings:

1. Identify the adjustment screws: There are typically three adjustment screws on the carburetor – the low-speed screw (L), the high-speed screw (H), and the idle-speed screw (LA). These screws are usually marked with the corresponding letters.
2. Starting point: Start by unscrewing the adjustment screws all the way until they are loose. This is the starting point for making adjustments.
3. Low-speed adjustment: To adjust the low-speed screw (L), start the saw and let it warm up. Then, turn the screw clockwise until the engine starts to sound rough and then back it out counterclockwise until the engine runs smoothly. This ensures the fuel mixture is not too lean or too rich.
4. High-speed adjustment: To adjust the high-speed screw (H), let the saw reach maximum RPM and then turn the screw clockwise until the engine starts to lose power. Then, back the screw out counterclockwise until the engine runs smoothly again. This ensures the fuel mixture is optimized for high-speed operation.
5. Idle-speed adjustment: To adjust the idle-speed screw (LA), let the engine idle and then turn the screw clockwise until the engine starts to stall. Then, back the screw out counterclockwise until the engine idles smoothly without stalling. This ensures the saw has a stable idle speed.

After adjusting the carburetor settings, it is advisable to test the saw’s performance by cutting some concrete. If the performance is still not satisfactory, further adjustments may be necessary. It is always recommended to consult the Stihl concrete saw’s manual for specific instructions on adjusting the carburetor settings, as different models may have slightly different procedures.

Remember, adjusting the carburetor settings requires careful attention and precision. If you are unsure about making the adjustments yourself, it is recommended to take your Stihl concrete saw to a qualified professional for assistance.

Inspecting the fuel system

One of the common causes of issues with a Stihl concrete saw is a problem with the fuel system. To diagnose and fix the problem, follow these steps:

1. Begin by checking the fuel tank. Ensure that it is filled with fresh fuel and that the fuel cap is securely tightened. If the fuel is old or contaminated, it may need to be drained and replaced.

2. Next, inspect the fuel lines for any cracks, leaks, or blockages. If any issues are found, the damaged fuel lines should be replaced. If the fuel lines are blocked, clean them by blowing compressed air through them or using a small wire.

3. Check the fuel filter for any signs of blockage or debris. A clogged fuel filter can restrict the flow of fuel and cause the saw to run poorly or not start at all. If the filter is dirty, it should be replaced.

4. Ensure the carburetor is clean and free from any dirt or debris. Use carburetor cleaner and a small brush to remove any buildup or blockages. If the carburetor is damaged or worn, it may need to be replaced.

5. Finally, check the fuel pump for proper operation. The fuel pump should be pumping fuel when the saw is running. If the pump is not working, it may need to be replaced.

By inspecting and maintaining the fuel system of your Stihl concrete saw, you can help ensure its optimal performance and prevent any issues from arising.

Replacing the cutting blade

When your Stihl concrete saw’s cutting blade becomes dull or damaged, it is essential to replace it to maintain optimal performance. Here are the steps to follow:

Tools and materials you will need:

• Allen wrench
• New cutting blade
• Gloves
• Safety goggles

Instructions:

1. Ensure the Stihl concrete saw is switched off and disconnected from any power source.
2. Put on your safety goggles and gloves to protect your eyes and hands.
3. Locate the blade retaining bolt at the center of the blade.
4. Use an Allen wrench to loosen the blade retaining bolt by turning it counterclockwise.
5. Once the bolt is sufficiently loosened, remove it and set it aside.
6. Carefully lift the old cutting blade off the saw.
7. Take the new cutting blade and align the mounting hole with the shaft of the saw.
8. Lower the new cutting blade onto the saw, ensuring it fits snugly.
9. Secure the new cutting blade in place by tightening the blade retaining bolt with the Allen wrench, turning it clockwise.
10. Check that the blade is securely fastened.
11. Test the saw by powering it on without cutting any material to ensure the blade is properly installed.
12. If the blade is aligned and working correctly, you can proceed with your cutting tasks.

Remember to always exercise caution when working with power tools and blades. Following these steps will help you replace the cutting blade on your Stihl concrete saw safely and efficiently.

Troubleshooting tips:

If you encounter any issues during the blade replacement process, refer to the user manual or contact a Stihl authorized dealer for assistance. They will provide guidance on how to fix any problems and ensure your saw is in optimal working condition.