Welcome to the STIHL MS 251 C-BE manual, your comprehensive guide for safe and effective operation․ This manual covers essential safety, features, and technical specifications for optimal performance․
Overview of the STIHL MS 251 C-BE Chain Saw
The STIHL MS 251 C-BE is a high-performance chain saw designed for demanding tasks․ It features a powerful two-stroke engine with 45․6 cm³ displacement, a 44 mm cylinder bore, and a 44 mm piston stroke․ Equipped with a reliable ignition system and a carburetor for efficient fuel delivery, this saw is built for durability and precision․ The C-BE model includes advanced features like the Easy2Start system and a manual fuel primer for effortless starting․ Ideal for professional and homeowner use․
Importance of the Instruction Manual
The instruction manual is essential for the safe and effective operation of the STIHL MS 251 C-BE chain saw․ It provides critical safety guidelines, operating instructions, and maintenance procedures․ The manual also includes troubleshooting tips and warranty information․ Understanding the content ensures optimal performance and longevity of the chain saw․ Always keep the manual accessible and ensure anyone operating the saw reviews it thoroughly․
Key Features and Technical Specifications
The STIHL MS 251 C-BE features a powerful two-stroke engine with 45․6 cm³ displacement․ It includes a 44 mm cylinder bore, 44 mm piston stroke, electronic ignition, and a carburetor fuel system․
Engine Type and Displacement
The STIHL MS 251 C-BE is equipped with a high-performance two-stroke engine․ With a displacement of 45․6 cm³, it delivers robust power for demanding cutting tasks․ The engine’s compact design ensures efficiency and reliability, making it suitable for professional and homeowner use․ This two-stroke powerplant is known for its lightweight construction and exceptional performance in various logging and woodworking applications․
Cylinder Bore and Piston Stroke
The STIHL MS 251 C-BE features a cylinder bore of 44 mm and a piston stroke of 33 mm․ These dimensions ensure optimal combustion efficiency and power output․ The precise engineering of the cylinder and piston contributes to smooth operation, reduced emissions, and increased durability․ This design enhances the engine’s performance, making it ideal for cutting through dense wood effortlessly while maintaining fuel efficiency and reliability in challenging conditions․
Ignition and Fuel System
The STIHL MS 251 C-BE features an electronic magneto ignition system, ensuring reliable engine starts and consistent performance․ The fuel system includes a carburetor that efficiently mixes air and fuel for optimal combustion․ This design enhances engine efficiency, reduces emissions, and provides smooth operation across various cutting conditions․ The carburetor’s precise tuning ensures the right air-fuel mixture, contributing to the saw’s powerful and dependable performance in demanding environments․
Safety Instructions and Precautions
Always operate in well-ventilated areas to avoid carbon monoxide risks․ Wear protective gear, including gloves, safety glasses, and a helmet․ Never lend the saw without the manual․
General Safety Guidelines
Always follow safety guidelines to ensure safe operation․ Wear protective gear, including gloves, safety glasses, and a helmet․ Operate in well-ventilated areas to avoid carbon monoxide risks․ Ensure the chain saw is properly maintained․ Keep loose clothing and long hair tied back; Avoid operating when fatigued or under the influence of drugs or alcohol․ Never let unauthorized or untrained individuals use the saw․ Ensure everyone using the saw understands the manual’s safety information․
Operating in Well-Ventilated Areas
Always operate the STIHL MS 251 C-BE in well-ventilated areas to prevent carbon monoxide buildup․ Avoid enclosed or poorly ventilated spaces, especially when the saw is equipped with a catalytic converter․ Inadequate ventilation can lead to dangerous fumes, posing serious health risks․ Ensure proper airflow to maintain operator safety and prevent mechanical issues related to exhaust system performance․ This guideline is critical for both indoor and outdoor operations․
Proper Use of Protective Equipment
Always wear approved protective gear when operating the STIHL MS 251 C-BE․ This includes a helmet, safety glasses, gloves, and chainsaw chaps or protective pants․ Ensure a proper fit to avoid restricted movement․ Protective equipment is essential to minimize injury risks from flying debris or accidental contact with the chain․ Regularly inspect gear for wear and tear, and replace as needed․ Compliance with safety standards is crucial for operator protection and safe operation of the saw․
Assembly and Tool Setup
Unpacking and inspecting the STIHL MS 251 C-BE is essential․ Install the guide bar and chain, ensuring proper alignment․ Adjust the chain tension for optimal performance․
Unpacking and Initial Inspection
Begin by carefully unpacking the STIHL MS 251 C-BE chain saw and inspecting for any damage or missing components․ Verify the guide bar and chain are included and undamaged․ Ensure all parts, such as the air filter and muffler, are present and properly attached․ Familiarize yourself with the tool’s components and refer to the manual for a detailed inventory․ Handle the chain and bar with care to avoid injury․ Always follow safety guidelines during inspection․
Installing the Guide Bar and Chain
Install the guide bar by aligning it with the saw’s mounting bracket and securing it with the provided screws․ Ensure the chain is properly seated on the bar, with the cutting edges facing the correct direction․ Tighten the chain according to the manual’s tensioning guidelines to ensure optimal performance and safety․ Always wear gloves during this process to avoid injury from sharp edges or accidental starts․
Adjusting the Chain Tension
Proper chain tension is crucial for safe and efficient cutting․ Use the quick chain adjuster to tighten the chain by turning the screw clockwise until it snugly fits the guide bar․ Ensure the chain does not sag excessively but remains loose enough to move freely․ Refer to the manual for specific tensioning guidelines to avoid damage or performance issues․ Always wear gloves when handling the chain or bar․
Operating Instructions
Learn how to start, stop, and safely operate your STIHL MS 251 C-BE chainsaw․ Follow guidelines for proper cutting techniques and maintaining control during use․
Starting the Chain Saw
To start the STIHL MS 251 C-BE, ensure the chain brake is engaged․ Prime the fuel system by pressing the primer bulb firmly․ Move the choke to the “start” position and pull the starter handle until the engine coughs․ Release the choke and pull the starter again until the engine runs․ Allow the saw to warm up before use․ Always refer to the manual for specific starting procedures and safety precautions․
Stopping the Chain Saw
To safely stop the STIHL MS 251 C-BE, first engage the chain brake to halt the chain․ Next, stop the engine by switching off the ignition․ Allow the saw to cool before storing it․ Always ensure the chain is stationary and the brake is engaged when not in use․ Proper shutdown helps maintain the saw’s condition and ensures operator safety․ Consult the manual for detailed steps and safety tips․
Basic Cutting Techniques
Start with small, controlled cuts to build confidence․ Maintain a firm grip and proper stance for stability․ Keep the chain at a consistent angle, using the saw’s momentum rather than force․ Avoid cutting in a jerky motion; instead, make steady, smooth passes․ Always cut on the pushing stroke, using the saw’s weight to aid the cut․ Ensure the chain is sharp for efficient cutting and to minimize strain on the engine․ Follow the manual’s guidelines for optimal results and safety․
Maintenance and Servicing
Regular maintenance ensures optimal performance․ Check and clean the air filter, sharpen the chain, and lubricate moving parts․ Refer to the manual for detailed procedures․
Chain Sharpening and Replacement
Proper chain maintenance is crucial for efficient cutting․ Sharpen the chain regularly using a STIHL sharpening tool, ensuring correct angle and depth․ Replace the chain when worn or damaged․ Always use genuine STIHL parts for optimal performance․ Refer to the manual for specific sharpening techniques and replacement guidelines to maintain safety and effectiveness․ Regular inspections and timely replacements prevent accidents and ensure prolonged chain life․
Cleaning the Air Filter
Cleaning the air filter is essential for maintaining optimal engine performance․ Remove the filter and gently brush off dirt with a soft brush or blow with compressed air․ Avoid harsh chemicals or high-pressure washes․ Regular cleaning prevents dust buildup and ensures proper airflow, protecting the engine and improving efficiency․ Refer to the manual for detailed steps and recommendations to keep your STIHL MS 251 C-BE running smoothly and efficiently․
Lubricating Moving Parts
Regular lubrication of moving parts is crucial for maintaining your STIHL MS 251 C-BE’s performance and longevity․ Apply high-quality grease or oil to components like the chain bar, sprocket, and crankshaft․ This reduces friction, prevents wear, and ensures smooth operation․ Always use STIHL-approved lubricants for optimal results․ Refer to the manual for specific intervals and application instructions to keep your chain saw in peak condition and minimize the risk of mechanical failure․
Troubleshooting Common Issues
This section helps identify and resolve common issues with your STIHL MS 251 C-BE, ensuring optimal performance and minimizing downtime․ Refer to the manual for detailed guidance․
Difficulty Starting the Engine
If the engine is hard to start, check for a flooded engine by pressing the primer bulb gently․ Ensure the choke is in the correct position and the fuel filter is clean․ Verify the spark plug is functioning properly and not fouled․ Consult the manual for detailed troubleshooting steps, including checking the ignition system and fuel flow․ Addressing these issues can resolve starting problems efficiently․
Chain Not Cutting Properly
If the chain is not cutting effectively, check for dullness or improper tension․ A dull chain requires sharpening, while loose tension needs adjustment․ Ensure the chain is properly lubricated and free of debris․ Incorrect chain type or bar alignment can also affect performance․ Refer to the manual for guidance on sharpening, tensioning, and maintaining the chain for optimal cutting efficiency and safety․
Excessive Vibration
Excessive vibration can occur due to improper chain tension, a dull chain, or an unbalanced bar․ Check the chain for wear and sharpen or replace it if necessary․ Ensure the chain is properly tensioned and aligned․ A loose or damaged bar can also cause vibration․ Refer to the manual for guidance on adjusting and maintaining the bar and chain to minimize vibration and ensure smooth operation․
Warranty and Customer Support
STIHL offers comprehensive warranty coverage for the MS 251 C-BE․ Contact authorized dealers for support or visit the official website for detailed warranty terms and online resources․
STIHL Warranty Coverage
The STIHL MS 251 C-BE is backed by a comprehensive warranty program․ It covers manufacturing defects for a specified period, ensuring reliability and performance․ Proper maintenance, as outlined in the manual, is required to maintain warranty validity․ The warranty period varies depending on usage, with extended coverage for non-professional users․ For full details, refer to the manual or contact an authorized STIHL dealer․
Contacting STIHL Dealers
Your local STIHL dealer is a valuable resource for assistance․ They provide expert advice, maintenance services, and genuine parts for your MS 251 C-BE․ Contact them for troubleshooting, warranty inquiries, or to schedule routine maintenance․ Dealers are trained to ensure your chain saw operates at peak performance․ Visit the STIHL website to locate your nearest authorized dealer and benefit from their professional support and extensive knowledge․
Online Resources and Manuals
STIHL offers comprehensive online resources for the MS 251 C-BE, including downloadable manuals in multiple languages․ Visit the official STIHL website to access the latest versions of instruction manuals, ensuring you have accurate and up-to-date information․ These resources cover safety guidelines, technical specifications, and maintenance tips․ For troubleshooting or detailed instructions, the online manual is a valuable tool․ If additional support is needed, online forums and FAQs are available to address common questions and concerns effectively․