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Technical Specifications of the STIHL MS 251 C BE
The STIHL MS 251 C BE features a powerful two-stroke engine with a displacement of 45.6 cc. It has a cylinder bore of 44 mm and a stroke of 30 mm‚ ensuring efficient performance. The engine is equipped with STIHL’s 2-MIX technology‚ which reduces emissions and enhances fuel efficiency. The chainsaw also includes an air-cooled system for optimal temperature management. The bar and chain system supports a 0.325 inch pitch and a 0.050 inch gauge‚ making it suitable for various cutting tasks.
1.1 Engine Details
The STIHL MS 251 C BE is powered by a high-performance two-stroke engine with a displacement of 45.6 cc. The engine features a cylinder bore of 44 mm and a stroke of 30 mm‚ ensuring efficient power delivery. Equipped with STIHL’s 2-MIX engine technology‚ it combines high performance with reduced emissions and lower fuel consumption. The engine is air-cooled‚ which helps maintain optimal operating temperatures. Additionally‚ the Easy2Start™ system simplifies starting‚ reducing the effort needed to pull the starter cord. The manual fuel primer also aids in easy starting by delivering the right amount of fuel to the engine. These features make the MS 251 C BE a reliable choice for demanding cutting tasks.
1.2 Performance Features
The STIHL MS 251 C BE delivers exceptional cutting performance with its high-torque engine‚ making it suitable for challenging tasks like felling and cutting large trees. The 0.325 inch pitch chain and 0.050 inch gauge provide precise cuts and minimize wear. Its QuickStop® chain brake system ensures rapid stopping for enhanced safety. The chainsaw also features an anti-vibration system‚ reducing operator fatigue during extended use. With a power-to-weight ratio optimized for efficiency‚ the MS 251 C BE balances strength and agility‚ making it ideal for professional and demanding applications. These performance features ensure reliable operation and superior results in various environments.
Safety Precautions
Always wear protective gear‚ including a helmet‚ gloves‚ and safety glasses. Ensure proper ventilation when operating. Only authorized individuals who understand the manual should use the chainsaw.
2.1 General Safety Guidelines
Always wear proper protective equipment‚ including safety glasses‚ gloves‚ and a helmet with a face shield. Ensure the working area is clear of obstacles and bystanders. Operate the chainsaw only in well-ventilated areas to avoid inhaling harmful fumes. Avoid using the tool in wet conditions or near open flames. Keep loose clothing and long hair tied back to prevent accidents. Maintain a firm grip on the handles and avoid overreaching. Never start the engine indoors or in poorly ventilated spaces. Ensure the chain is properly sharpened and adjusted to avoid kickback. Regularly inspect the saw for damage or wear and perform necessary repairs before use. Follow all instructions in the manual and seek training if unsure about any operation.
2.2 Understanding Safety Symbols
The STIHL MS 251 C BE manual includes several safety symbols to alert users of potential hazards. These symbols are standardized and appear on the chainsaw itself or in the manual. The warning triangle indicates a hazard that could cause injury or death. Symbols for protective equipment‚ such as helmets and gloves‚ remind users to wear safety gear. Other symbols warn of sharp cutting edges‚ hot surfaces‚ or the risk of kickback. Always familiarize yourself with these symbols before operating the chainsaw. Refer to the manual for detailed explanations of each symbol. Understanding these warnings is crucial for safe operation. Never ignore safety symbols‚ as they are designed to protect you from harm. Read the manual carefully to ensure compliance with all safety guidelines.
Operating Instructions
Always wear protective gear and follow safety guidelines. Start the engine with the primer and choke‚ then adjust the throttle. Maintain proper cutting techniques to avoid kickback. Ensure the chain is sharp for efficient cutting. Keep the chainsaw well-balanced and firmly gripped. Operate in a safe‚ open area away from bystanders. Regularly check and maintain the chain and bar for optimal performance. Avoid overreaching and cut on the side of the bar designed for cutting. If unsure‚ consult the manual or contact a STIHL professional. Never operate the chainsaw while fatigued or in unsafe conditions.
3.1 Starting the Engine
To start the STIHL MS 251 C BE‚ begin by ensuring the chain brake is engaged and wear protective gear. Locate the primer on the carburetor and press it 3-5 times to prime the engine. Move the choke lever to the “start” position; Grip the starter handle firmly and pull the starter rope with a smooth‚ steady motion until the engine “pops.” Return the choke lever to the “run” position and pull the starter rope again until the engine starts. Allow the engine to warm up briefly before use. If equipped with Easy2Start‚ depress the throttle trigger and pull the starter rope; the system will automatically adjust the choke. Always refer to the manual for specific starting procedures and safety tips.
3.2 Working Techniques
Proper working techniques ensure safe and efficient operation of the STIHL MS 251 C BE. Always maintain a firm grip on the handle and keep your body balanced. For cutting‚ position the saw at a comfortable height and use your thighs to support the weight. When felling trees‚ make precise horizontal cuts at waist height‚ using a 45-degree angle for the backcut to control the direction of the fall. For bucking (cutting logs)‚ place the saw on the center of the log and apply steady pressure. Use the chain brake when moving between cuts to prevent accidental starts. Ensure the chain is sharp and well-maintained for optimal performance. Avoid overreaching and always keep the saw close to your body for better control. Refer to the manual for detailed guidelines on specific cutting techniques.
Maintenance and Servicing
Regular maintenance is crucial for optimal performance. Clean or replace the air filter and check the spark plug frequently. Lubricate the chain and guide bar regularly. Change the engine oil every 50 hours of use. Sharpen the chain as needed and ensure proper tension. Inspect and clean the muffler to prevent carbon buildup. Refer to the manual for detailed servicing schedules and procedures to maintain the saw’s efficiency and longevity.
4.1 Regular Maintenance Checks
Regular maintenance checks are essential to ensure the STIHL MS 251 C BE operates safely and efficiently. Start by inspecting the air filter and cleaning or replacing it as needed to maintain proper airflow. Check the spark plug for wear or fouling and replace it every 100 hours of operation. Examine the chain for sharpness and damage‚ and ensure it is properly tensioned. Inspect the guide bar for wear or burrs and clean it regularly. Verify the muffler is free of debris and carbon buildup. Additionally‚ monitor the engine oil level and top it off as required. Always refer to the manual for specific maintenance intervals and procedures to keep your chainsaw in optimal condition.
4.2 Chain and Bar Maintenance
Proper maintenance of the chain and guide bar is crucial for optimal performance. Regularly inspect the chain for sharpness‚ wear‚ and damage. Dull or damaged chains should be sharpened or replaced immediately. Use a 5.2 mm file for sharpening to maintain the correct cutter angle. Ensure the chain is properly lubricated with STIHL chain oil to reduce wear and prevent rust. For the guide bar‚ clean the oil holes and slots regularly to ensure proper oil flow. Inspect the bar for wear or burr buildup and lightly sand or file as needed. Check the chain tension and adjust it to prevent sagging or over-tightening. Replace the guide bar if there are signs of significant wear or misalignment. Proper chain and bar maintenance ensures smooth cutting and extends the life of your chainsaw.
Troubleshooting Common Issues
Common issues include engine starting problems‚ poor performance‚ or chain malfunction. Check for fuel quality‚ spark plug condition‚ and proper chain tension. Consult the manual for detailed diagnostics and solutions.
5.1 Diagnosing Engine Problems
Diagnosing engine issues in the STIHL MS 251 C BE involves checking common faults like failure to start‚ rough running‚ or overheating. Begin by ensuring the fuel mixture is correct and the spark plug is in good condition. Inspect the air filter for cleanliness and the muffler for blockages. If the engine stalls‚ check the carburetor settings or for fuel line blockages. Overheating may indicate a cooling system issue or excessive workload. Refer to the manual for specific troubleshooting steps and adjustments to restore optimal performance. Always follow safety guidelines when diagnosing and repairing engine problems.
Warranty and Spare Parts
The STIHL MS 251 C BE is backed by a comprehensive warranty covering defects in materials and workmanship. Genuine spare parts are available through authorized dealers to ensure optimal performance and longevity of the chainsaw.
6.1 Warranty Information
The STIHL MS 251 C BE is covered by a comprehensive manufacturer’s warranty that protects against defects in materials and workmanship. The warranty period begins from the date of purchase and varies depending on the region and usage conditions. For residential use‚ the warranty typically covers the chainsaw for two years‚ while commercial or professional use may have a shorter duration. To maintain warranty validity‚ the chainsaw must be serviced exclusively by authorized STIHL dealers using genuine STIHL parts. Any unauthorized modifications or the use of non-genuine components may void the warranty. Contact your local STIHL dealer for specific terms and conditions‚ as well as to initiate any warranty claims or repairs.