This comprehensive guide provides essential information for safe and effective operation of the Stihl MS 251 chainsaw‚ covering safety‚ maintenance‚ and optimal performance techniques.
1.1 Overview of the Stihl MS 251 Chainsaw
The Stihl MS 251 is a powerful‚ lightweight chainsaw designed for versatility and durability. It features a robust two-stroke engine with the 2-MIX system‚ ensuring efficient fuel consumption and reduced emissions. With a fuel tank capacity of 0.39 liters‚ it delivers reliable performance for both professional and domestic use. Its ergonomic design and high RPM capabilities make it ideal for cutting firewood‚ felling trees‚ and other demanding tasks‚ offering precision and ease of operation.
1.2 Importance of Reading the Manual
Reading the Stihl MS 251 manual is crucial for understanding safety guidelines‚ proper operation‚ and maintenance. It ensures users can operate the chainsaw safely and effectively‚ reducing the risk of accidents and equipment damage.
The manual provides detailed instructions on starting procedures‚ working techniques‚ and troubleshooting common issues. It also highlights essential safety precautions and reactive forces‚ ensuring optimal performance and longevity of the tool. Compliance with the manual is vital for warranty validity and manufacturer recommendations;
Safety Guidelines and Precautions
Always engage the chain brake and wear protective gear. Understand reactive forces and ensure the saw is properly maintained to prevent accidents and ensure safe operation.
2.1 General Safety Instructions
Always wear protective gear‚ including gloves‚ safety glasses‚ and sturdy footwear. Ensure the chain brake is engaged before transport or maintenance. Read and fully understand this manual to operate the saw safely. Be aware of reactive forces and kickback risks. Keep loose clothing and long hair tied back. Maintain a firm grip on the handles and avoid cutting in unsafe or unstable conditions. Regularly inspect the saw for damage or wear. Follow all safety guidelines to prevent accidents and ensure safe‚ effective operation of the Stihl MS 251 chainsaw.
2.2 Understanding Reactive Forces
Reactive forces‚ such as kickback‚ occur when the saw chain binds or pinches during cutting. These forces can cause sudden‚ uncontrollable movement of the chainsaw. Always maintain a firm grip on the handles and be prepared for unexpected reactions. Cutting techniques‚ such as proper chain positioning and avoiding overreach‚ can minimize the risk of reactive forces. Understanding and managing these forces is essential for safe operation and preventing accidents while using the Stihl MS 251 chainsaw.
2.3 Proper Use of the Chain Brake
The chain brake is a critical safety feature designed to stop the saw chain instantly in case of kickback or loss of control. Always engage the chain brake before starting the engine and during transport. To activate‚ push the brake forward firmly until it clicks. Regularly check the brake’s functionality and clean it to ensure proper operation; Never ride the brake‚ as this can cause premature wear; Proper use of the chain brake significantly reduces the risk of accidents and ensures safer operation of the Stihl MS 251 chainsaw.
Technical Specifications of the Stihl MS 251
The Stihl MS 251 features a powerful two-stroke engine with a maximum speed of 10‚000 RPM and an idle speed of 2‚800 RPM‚ offering reliable performance for demanding tasks.
3.1 Engine Details and Performance
The Stihl MS 251 is equipped with a high-performance‚ two-stroke engine that delivers exceptional power and efficiency. It features a robust 2-MIX engine technology‚ which reduces fuel consumption and emissions. The engine operates at a maximum speed of 10‚000 RPM and an idle speed of 2‚800 RPM‚ ensuring smooth operation across various cutting tasks. Its electronic ignition system provides reliable starts‚ while the carburetor ensures consistent fuel delivery. This combination makes the MS 251 ideal for professional and demanding applications‚ offering a balance of power and precision.
3.2 Fuel Tank Capacity and Consumption
The Stihl MS 251 features a fuel tank capacity of 0.39 liters‚ ensuring extended operation without frequent refueling. Its efficient two-stroke engine is designed to minimize fuel consumption‚ making it suitable for demanding tasks. The saw operates on a 50:1 gasoline-to-oil mixture‚ and proper fuel management is essential for optimal performance. Regular monitoring of fuel levels and adherence to the recommended mix ratio help maintain engine health and productivity‚ ensuring reliable operation in various cutting conditions.
3.4 Key Features and Accessories
The Stihl MS 251 offers advanced features like the Easy2Start system for effortless engine starting and a Quick Chain Adjuster for tool-free chain tensioning. It also includes a manual fuel primer to simplify cold starts. Accessories such as the chain scabbard‚ additional chains‚ and protective gear enhance functionality and safety. Optional equipment like the STIHL Anti-Vibration System reduces user fatigue‚ ensuring comfortable operation during extended use. These features and accessories collectively contribute to a seamless and efficient cutting experience.
Operating Instructions
Learn proper techniques for starting‚ handling‚ and shutting down the chainsaw‚ ensuring safe and efficient operation with clear guidance for optimal performance and maintenance routines.
4.1 Starting the Chainsaw
To start the Stihl MS 251‚ ensure the chain brake is engaged for safety. Move the master control lever to the “start” position and press the primer bulb 2-3 times. Pull the starter handle gently until resistance is felt‚ then pull firmly to engage the engine. Once the engine coughs‚ move the master control lever to the “run” position. Allow the saw to warm up before use. Always follow proper starting procedures to ensure reliable performance and minimize wear on the engine.
4.2 Working Techniques for Optimal Performance
For optimal performance‚ maintain proper posture and grip while operating the Stihl MS 251. Apply even pressure and avoid forcing the saw‚ as this can lead to inefficiency or kickback. Keep the chain sharp‚ as a dull chain increases cutting time and wear. Use proper cutting techniques‚ such as maintaining a steady‚ controlled motion and avoiding heavy pressure. Regularly clean the chain and bar to ensure smooth operation. By following these guidelines‚ you can achieve precise cuts‚ reduce fatigue‚ and extend the lifespan of your chainsaw.
Maintenance and Servicing
Regular maintenance ensures optimal performance and longevity of the Stihl MS 251. Clean or replace air filters‚ check chain tension‚ sharpen or replace chains‚ and use genuine Stihl tools for servicing. Always follow the manual’s guidelines for safe and effective maintenance.
5.1 Regular Servicing Requirements
Regular servicing is crucial for maintaining the Stihl MS 251’s performance and longevity. Clean or replace air filters every 10 hours of use to ensure proper airflow. Check chain tension daily and adjust as needed to prevent wear. Sharpen the chain regularly or replace it when worn. Lubricate moving parts and inspect for damage. Use genuine Stihl tools and accessories for servicing to ensure compatibility and safety. Follow the manual’s guidelines for routine maintenance to keep your chainsaw running efficiently and reliably over time.
5.2 Tool Usage and Maintenance Tips
Use genuine Stihl tools for compatibility and safety. Store tools in a dry place to prevent rust. Lubricate moving parts regularly to maintain smooth operation. Always use the correct file size when sharpening the chain for optimal performance. Check tools for wear and replace them as needed. Keep the chain scabbard on when not in use to protect the bar and chain. Refer to the manual for specific maintenance procedures to ensure longevity and efficiency of your Stihl MS 251 chainsaw.
Troubleshooting Common Issues
This section addresses frequent problems like chain malfunctions‚ engine issues‚ and brake system errors‚ offering practical solutions to ensure optimal performance and safety of the Stihl MS 251 chainsaw.
6.1 Diagnosing Chain Brake Problems
Chain brake issues often arise from improper activation or wear. Check if the brake engages smoothly and releases fully. Inspect for damage or debris on the brake components. Ensure the chain is properly tensioned‚ as loose chains can trigger accidental stops. Refer to the manual for specific troubleshooting steps‚ such as cleaning or replacing worn parts. If problems persist‚ consult a certified STIHL technician to ensure safe and effective operation of the MS 251 chainsaw.
6.2 Solving Engine Performance Issues
Common engine issues include poor starting‚ uneven idle‚ or reduced power. Check fuel quality and mix ratio‚ ensuring proper two-stroke fuel is used. Old or incorrect fuel can clog the carburetor. Verify the air filter is clean and free of debris. A faulty spark plug or ignition system may also cause problems. Adjust the carburetor settings as outlined in the manual. If issues persist‚ consult a certified STIHL technician for professional diagnosis and repair to restore optimal engine performance.
Accessories and Compatibility
This section explores compatible accessories for the Stihl MS 251‚ including chains‚ bars‚ and protective gear. Using genuine STIHL parts ensures safety and optimal performance. Always consult the manual for specific product recommendations to maintain compatibility and functionality.
7.1 Recommended Accessories for the MS 251
To enhance performance and safety‚ STIHL recommends specific accessories for the MS 251. These include high-quality saw chains designed for optimal cutting efficiency‚ guide bars tailored for precise cutting‚ and protective equipment like gloves and helmets. Additionally‚ filing kits and chain lubricants are essential for maintenance. Using genuine STIHL accessories ensures compatibility and maximizes the chainsaw’s reliability. Always refer to the manual for a detailed list of approved accessories to maintain safety and performance standards.
7.2 Ensuring Proper Fit and Compatibility
Always use STIHL-approved accessories to ensure proper fit and compatibility with the MS 251. Check part numbers and refer to the manual for specific recommendations. Incorrect accessories may lead to poor performance‚ safety risks‚ or damage to the chainsaw. Verify compatibility before installation and test the fit to guarantee secure operation. Genuine STIHL parts are designed to meet safety and performance standards‚ ensuring reliable use of your MS 251 chainsaw.