Properly adjusting the carburettor on your Makita concrete saw is essential for optimal performance and longevity of the tool. The carburettor controls the air-fuel mixture that powers the engine, so it’s important to make sure it is set correctly.
Before you begin, it’s important to note that carburettor adjustments should only be done by someone with knowledge and experience in small engine repair. If you are not confident in your ability to make these adjustments, it is best to consult a professional.
Start by locating the carburettor on your Makita concrete saw. It is typically found on the side of the engine and has several screws and adjustment knobs. Take a moment to familiarize yourself with the different components of the carburettor.
Next, you will need to determine if the carburettor needs any adjustment. If your Makita concrete saw is experiencing issues such as a rough idle, stalling, or a loss of power, it could be a sign that the carburettor needs adjustment. Additionally, if you have recently cleaned or rebuilt the carburettor, it will likely need to be readjusted.
Adjusting the Carburettor: Step-by-Step Guide for a Makita Concrete Saw
If you’re experiencing issues with the performance of your Makita concrete saw, it may be necessary to adjust the carburettor. The carburettor controls the mixture of fuel and air that runs the engine, and incorrect adjustment can lead to poor running or lack of power. Follow this step-by-step guide to adjust the carburettor on your Makita concrete saw and optimize its performance.
| Step | Procedure |
|---|---|
| 1 | Start by locating the carburettor on your Makita concrete saw. It is typically located near the air filter housing and is connected to the engine with a fuel line. |
| 2 | Before making any adjustments, ensure that the engine is off and cool. Disconnect the spark plug wire to prevent accidental starting. |
| 3 | Identify the adjustment screws on the carburettor. There are usually three screws: the idle speed screw, the low-speed mixture screw, and the high-speed mixture screw. |
| 4 | To adjust the idle speed, turn the idle speed screw clockwise to increase the idle speed or counterclockwise to decrease it. The correct idle speed is usually specified in the saw’s manual. |
| 5 | Next, adjust the low-speed mixture screw. Turn it clockwise until it is fully closed, then back it out counterclockwise 1.5 turns as a starting point. |
| 6 | Start the engine and let it warm up for a few minutes. Then, with the engine running at idle, slowly turn the low-speed mixture screw clockwise until the engine begins to run rough. |
| 7 | Now, turn the low-speed mixture screw counterclockwise until the engine runs smoothly. Fine-tune the adjustment by turning the screw in small increments until the saw idles smoothly without hesitation. |
| 8 | Finally, adjust the high-speed mixture screw. This screw controls the fuel mixture at full throttle. Start by turning it clockwise until it is fully closed, then back it out counterclockwise 1.5 turns. |
| 9 | With the engine running at full throttle, slowly turn the high-speed mixture screw clockwise until the engine starts to run lean (sputtering or losing power). |
| 10 | Then, turn the high-speed mixture screw counterclockwise until the engine runs smoothly without any signs of running rich (excessive smoke or fouled spark plugs). |
By following these step-by-step instructions, you can properly adjust the carburettor on your Makita concrete saw and ensure optimal performance. It is always recommended to consult the saw’s manual for specific carburettor adjustment instructions and guidelines.
Understanding Carburettor Adjustment
Before adjusting the carburettor on your Makita concrete saw, it’s important to understand how the carburettor works and what its purpose is. The carburettor is responsible for mixing air and fuel in the correct ratio and delivering it to the engine. It consists of several components, including the throttle, idle speed screw, high-speed mixture screw, and low-speed mixture screw.
Throttle
The throttle controls the amount of air and fuel entering the carburettor and regulates the engine’s speed. When the throttle is fully closed, the engine idles, and when it’s fully open, the engine runs at full speed.
Idle Speed Screw
The idle speed screw allows you to adjust the engine’s idle speed. Turning the screw clockwise increases the idle speed, while turning it counterclockwise decreases it. It’s important to set the idle speed correctly, as a low idle speed can cause stalling, while a high idle speed can cause excessive wear on the engine.
High-Speed Mixture Screw
The high-speed mixture screw controls the fuel mixture at high engine speeds. Turning the screw clockwise enriches the fuel mixture, while turning it counterclockwise leans it out. It’s crucial to set the high-speed mixture correctly to optimize engine performance, prevent overheating, and reduce fuel consumption.
Low-Speed Mixture Screw
The low-speed mixture screw controls the fuel mixture at low engine speeds. Turning the screw clockwise enriches the fuel mixture, while turning it counterclockwise leans it out. Like the high-speed mixture screw, setting the low-speed mixture correctly ensures smooth idle and reliable performance.
When adjusting the carburettor on your Makita concrete saw, it’s essential to make incremental changes and test the saw’s performance after each adjustment. It’s also crucial to consult the manufacturer’s manual or seek professional guidance to ensure proper adjustment.
Tools Required for Carburettor Adjustment
Properly adjusting the carburettor on your Makita concrete saw requires a few essential tools. Before beginning this process, make sure you have the following tools at your disposal:
1. Screwdriver Set: A set of screwdrivers will be necessary to access and adjust the various screws on the carburettor. Make sure to have both flathead and Phillips screwdrivers in different sizes to accommodate different screw types.
2. Carburettor Adjusting Tool: A carburettor adjusting tool, also known as a carburettor screwdriver, is a specialized tool designed specifically for adjusting carburettors. This tool typically has a long, thin shaft with a small screwdriver-like end that fits into the carburettor adjustment screws.
3. Clean Cloth or Rag: It’s always a good idea to have a clean cloth or rag on hand to wipe away any excess fuel or dirt that may accumulate during the adjustment process. Keeping the carburettor clean and free of debris will help ensure accurate adjustments.
4. Work Gloves and Eye Protection: Safety should always be a top priority when working with power tools. Wearing work gloves and eye protection will help protect your hands and eyes from potential hazards, such as sharp edges or flying debris.
Note: It’s important to consult the user manual or manufacturer’s instructions specific to your Makita concrete saw model for any additional tools or safety equipment that may be required.
Step-by-Step Procedure for Adjusting the Carburettor on a Makita Concrete Saw
Having a properly adjusted carburettor is crucial for the optimal performance of your Makita concrete saw. If the carburettor is not properly adjusted, it can result in issues such as poor engine performance, rough idling, and difficulty starting the saw. Follow these step-by-step instructions to adjust the carburettor on your Makita concrete saw:
Step 1: Preparation
Before adjusting the carburettor, make sure that the saw is turned off and the engine is cool. Also, ensure that you have the necessary tools, including a small screwdriver and a tachometer.
Step 2: Identify the adjustment screws
Locate the three adjustment screws on the carburettor: the idle speed screw, the low-speed screw, and the high-speed screw. These screws are typically located on the side of the carburettor.
Step 3: Adjust the idle speed
Start by adjusting the idle speed screw. Turn the screw clockwise to increase the idle speed or counterclockwise to decrease it. The idle speed should be set to a level that allows the saw to idle smoothly without stalling.
Step 4: Adjust the low-speed mixture
To adjust the low-speed mixture, start the saw and let it warm up for a few minutes. Then, gradually turn the low-speed screw clockwise until the engine starts to slow down. At this point, turn the screw counterclockwise until the engine speeds up. Repeat this process until you find the optimal setting where the engine runs smoothly and accelerates without hesitation.
Step 5: Adjust the high-speed mixture
To adjust the high-speed mixture, hold the throttle trigger fully open and turn the high-speed screw clockwise until the engine starts to slow down. Then, turn the screw counterclockwise until the engine speeds up. Repeat this process until you find the optimal setting where the engine runs smoothly at full throttle without any hesitation or bogging down.
Step 6: Final adjustments
Once you have adjusted the idle speed, low-speed mixture, and high-speed mixture, check the idle speed again and make any necessary adjustments. Also, check the acceleration and deceleration of the saw to ensure smooth operation at all throttle levels.
It is recommended to refer to the specific instructions in your Makita concrete saw’s manual for the optimal carburettor adjustment settings. Following these step-by-step procedures will help you achieve the best performance from your saw and ensure its longevity.
| Step | Description |
|---|---|
| Step 1 | Ensure the saw is turned off and the engine is cool. Gather necessary tools. |
| Step 2 | Locate the idle speed screw, low-speed screw, and high-speed screw on the carburettor. |
| Step 3 | Adjust the idle speed screw to achieve smooth idling without stalling. |
| Step 4 | Adjust the low-speed mixture for optimal idle and acceleration. |
| Step 5 | Adjust the high-speed mixture for smooth operation at full throttle. |
| Step 6 | Make final adjustments and test acceleration and deceleration. |
