Husqvarna FS 5000 D, Stihl TS 800, and Makita EK7651H are among the best gas-powered walk-behind concrete saws. The Husqvarna FS 5000 D is known for its powerful engine, deep cutting capabilities, and user-friendly design, making it ideal for heavy-duty tasks. The Stihl TS 800 offers a robust engine, high cutting speed, and durability, suitable for both professional and DIY projects. The Makita EK7651H features a 4-stroke engine, reducing emissions and fuel consumption, while providing reliable performance and ease of use. These models are favored for their efficiency, durability, and advanced features, catering to various concrete cutting needs.

To maintain a gas-powered concrete saw, follow these steps: 1. **Regular Cleaning**: After each use, clean the saw thoroughly. Remove dust, debris, and concrete residue from the blade guard, air filter, and cooling fins using compressed air or a soft brush. 2. **Inspect and Replace the Blade**: Regularly check the diamond blade for wear and damage. Replace it if it shows signs of excessive wear, cracks, or missing segments to ensure efficient cutting and safety. 3. **Check Fuel System**: Use fresh, clean fuel and the correct oil-to-gas ratio as specified by the manufacturer. Inspect the fuel lines and tank for leaks or damage. Replace any cracked or brittle lines. 4. **Air Filter Maintenance**: Clean or replace the air filter regularly to ensure proper airflow and engine performance. A clogged air filter can lead to poor engine performance and increased fuel consumption. 5. **Spark Plug Inspection**: Check the spark plug for wear and carbon buildup. Clean or replace it as needed to ensure reliable ignition and efficient engine operation. 6. **Cooling System**: Ensure the cooling system is free of obstructions. Clean the cooling fins and ensure the fan is functioning properly to prevent overheating. 7. **Lubrication**: Regularly lubricate moving parts such as the throttle and choke cables to ensure smooth operation. 8. **Check and Tighten Bolts**: Periodically inspect and tighten all nuts, bolts, and screws to prevent loosening due to vibration during operation. 9. **Storage**: Store the saw in a dry, clean place. Drain the fuel if storing for an extended period to prevent gum deposits in the fuel system. 10. **Regular Servicing**: Follow the manufacturer’s maintenance schedule for professional servicing to address any complex issues and ensure optimal performance.

1. **Personal Protective Equipment (PPE):** Wear safety goggles, hearing protection, dust mask or respirator, steel-toed boots, and gloves to protect against debris, noise, and dust. 2. **Inspect Equipment:** Check the saw for any damage or wear, ensure all guards are in place, and verify that the blade is appropriate for the material being cut. 3. **Ventilation:** Operate the saw in a well-ventilated area to prevent carbon monoxide buildup from the gas engine. 4. **Fuel Safety:** Refuel the saw in a well-ventilated area, away from open flames or sparks. Use the correct fuel mixture and ensure the cap is securely fastened. 5. **Secure Work Area:** Clear the area of any obstacles, debris, or tripping hazards. Ensure bystanders are at a safe distance. 6. **Blade Safety:** Ensure the blade is properly mounted and tightened. Use only blades designed for the specific material being cut. 7. **Starting Procedure:** Start the saw on a flat surface, away from the cutting area, and ensure the blade is not in contact with the ground or any material. 8. **Cutting Technique:** Maintain a firm grip and stable stance. Cut at a steady pace without forcing the saw. Be aware of kickback and adjust your position accordingly. 9. **Dust Control:** Use water or a dust extraction system to minimize dust. Ensure the water supply is adequate and functioning. 10. **Emergency Preparedness:** Have a first aid kit and fire extinguisher nearby. Know the location of emergency shut-off controls. 11. **Training:** Ensure operators are trained in the use of the saw and understand all safety procedures. 12. **Maintenance:** Regularly maintain the saw according to the manufacturer’s instructions to ensure safe operation.

To choose the right blade for a gas-powered concrete saw, consider the following factors: 1. **Material Type**: Identify the material you will be cutting. Different blades are designed for specific materials such as concrete, asphalt, brick, or stone. For concrete, use a diamond blade, which is durable and efficient. 2. **Blade Type**: Choose between segmented, continuous rim, or turbo rim blades. Segmented blades are ideal for rough cuts in concrete and asphalt. Continuous rim blades provide smooth cuts and are suitable for tile and masonry. Turbo rim blades offer a balance between speed and smoothness, making them versatile for various materials. 3. **Blade Diameter**: Ensure the blade diameter matches the saw's specifications. Common sizes range from 12 to 16 inches, but always check the saw's manual for compatibility. 4. **Arbor Size**: Match the blade's arbor hole size with the saw's arbor. This ensures proper fitting and safe operation. 5. **Wet vs. Dry Cutting**: Decide between wet or dry cutting. Wet cutting blades require water to cool the blade and reduce dust, extending blade life. Dry cutting blades are used without water but may wear out faster and produce more dust. 6. **Blade Quality and Cost**: Higher quality blades, often more expensive, offer better performance and longevity. Consider the frequency of use and project size to determine if investing in a premium blade is worthwhile. 7. **RPM Rating**: Ensure the blade's RPM rating is compatible with the saw's speed to prevent damage and ensure safety. 8. **Manufacturer Recommendations**: Follow the saw and blade manufacturers' guidelines for optimal performance and safety. By considering these factors, you can select the appropriate blade for your gas-powered concrete saw, ensuring efficient and safe cutting.

The average cost of a gas-powered walk-behind concrete saw typically ranges from $1,000 to $3,500. The price can vary based on several factors, including the brand, blade size, engine power, and additional features. Entry-level models, which are suitable for smaller projects or less frequent use, might be found at the lower end of this range, around $1,000 to $1,500. These models usually have smaller engines and fewer features. Mid-range models, which offer a balance of power and features, generally cost between $1,500 and $2,500. These saws are suitable for more regular use and can handle a wider variety of tasks. They often come with enhanced durability and efficiency features. High-end models, which are designed for professional use and heavy-duty applications, can cost between $2,500 and $3,500 or more. These saws typically have larger engines, more advanced features, and are built to withstand rigorous use. They may also include features like self-propulsion, enhanced dust control, and improved ergonomics. Additional costs to consider include the price of replacement blades, which can range from $50 to $200 depending on the size and type, as well as maintenance and fuel costs. Accessories and attachments can also add to the overall expense. Overall, the choice of a gas-powered walk-behind concrete saw should be based on the specific needs of the project, frequency of use, and budget constraints.