F5 40C Stihl Chainsaw Review (5 Pro Tips for Firewood Masters)

The Stihl MS 251 C-BE: A Firewood Master’s Companion (and 5 Pro Tips)

The history of the chainsaw is interwoven with the history of human ingenuity. From the early, unwieldy hand-cranked surgical saws of the late 18th century, designed for symphysiotomies (don’t Google that before dinner!), to the lightweight, powerful machines we wield today, the chainsaw has revolutionized wood processing. My own journey with chainsaws began on a small family farm, where splitting wood for the winter was a ritual as essential as the changing of the seasons. It was there, wrestling with a temperamental old saw, that I learned respect for these tools and the power they hold. That early experience, and the many cords of wood I’ve processed since, have shaped my understanding of what makes a chainsaw truly valuable for firewood production.

This review focuses on the Stihl MS 251 C-BE, a chainsaw I’ve come to appreciate as a reliable workhorse, particularly for those of us dedicated to the art of firewood mastery. I’ll delve into its specifications, share my experiences using it, and offer five pro tips to maximize your efficiency and safety when turning logs into cozy warmth. Let’s dive in!

Understanding the Stihl MS 251 C-BE: Specifications and Features

The Stihl MS 251 C-BE is a mid-range chainsaw designed for both homeowners and professionals tackling smaller to medium-sized jobs. It strikes a balance between power, weight, and ease of use, making it a popular choice for firewood cutting, limbing, and felling smaller trees.

Key Specifications:

• Engine Displacement: 45.6 cc (2.78 cu. in.)
• Engine Power: 2.3 kW (3.1 bhp)
• Weight (Powerhead Only): 4.9 kg (10.8 lbs)
• Powerhead Weight lb/kW 2.13
• Fuel Capacity: 0.47 L (15.9 oz)
• Oil Capacity: 0.20 L (6.8 oz)
• Guide Bar Lengths (Recommended): 16″ (40 cm) and 18″ (45 cm) – I personally prefer the 16″ for firewood processing as it offers better maneuverability.
• Chain Pitch: 3/8″ P (Picco)
• STIHL Easy2Start™: Yes
• Quick Chain Adjuster (B): Yes
• STIHL Ematic™ Lubrication System: Yes
• Pre-Separation Air Filtration System: Yes
• Anti-Vibration System: Yes
• Sound Pressure Level (LpA): 103 dB(A)
• Sound Power Level (LWA): 114 dB(A)
• Vibration Level Left/Right: 3.9/3.9 m/s²

Feature Breakdown:

• Engine: The 45.6 cc engine provides ample power for cutting through hardwoods like oak and maple, as well as softer woods like pine and fir. Its power-to-weight ratio is excellent, allowing for extended use without excessive fatigue.
• STIHL Easy2Start™: This is a game-changer, especially in colder weather. The spring-assisted starting system significantly reduces the effort required to pull the starter cord. I remember wrestling with older chainsaws that required Herculean strength to start – the Easy2Start™ is a welcome innovation.
• Quick Chain Adjuster (B): This allows for tool-free chain tensioning. While convenient, I still recommend checking chain tension regularly and making fine adjustments with a screwdriver for optimal performance and chain life.
• STIHL Ematic™ Lubrication System: This system delivers bar oil precisely where it’s needed, reducing oil consumption and extending the life of the bar and chain. Proper chain lubrication is critical for safety and efficiency – a dry chain generates excessive heat and friction, leading to premature wear and potential kickback.
• Pre-Separation Air Filtration System: This system removes larger dirt particles from the air intake before they reach the air filter, extending the filter’s life and reducing the need for frequent cleaning. Clean air filters are vital for maintaining engine performance and fuel efficiency.
• Anti-Vibration System: Chainsaw vibration can cause fatigue and long-term health problems. The MS 251 C-BE’s anti-vibration system effectively dampens vibrations, allowing for longer periods of comfortable use.
• Master Control Lever™: This combines the choke, start, run, and stop functions into a single lever for simplified operation.

Data-Backed Insights:

• Engine Performance: The 2.3 kW engine output translates to approximately 3.1 horsepower. This is sufficient for cutting logs up to 16 inches in diameter, which is a common size for firewood.
• Weight and Ergonomics: At 4.9 kg (10.8 lbs), the MS 251 C-BE is relatively lightweight for its power class. This, combined with its ergonomic design, reduces fatigue and improves maneuverability.
• Fuel Efficiency: The MS 251 C-BE is designed for fuel efficiency, consuming approximately 0.7 liters of fuel per hour under moderate load. This translates to about 2-3 hours of runtime per tank, depending on the type of wood and cutting conditions.
• Vibration Levels: The vibration levels of 3.9 m/s² are within acceptable limits according to industry standards, minimizing the risk of vibration-related injuries. However, it’s still crucial to take regular breaks and use proper hand protection.

My Experience with the Stihl MS 251 C-BE

I’ve used the Stihl MS 251 C-BE extensively for firewood processing over the past few years. It’s become my go-to saw for tackling smaller to medium-sized logs. I’ve cut everything from seasoned oak to freshly felled pine with it. The Easy2Start™ system has been a lifesaver on cold mornings, and the quick chain adjuster has made maintenance a breeze.

One particular instance sticks in my mind. I was working on a large pile of oak logs, some of which were quite knotty and dense. The MS 251 C-BE handled them with surprising ease, although I did have to slow down and apply more pressure on the toughest sections. The Ematic™ lubrication system kept the chain well-oiled, preventing overheating and ensuring smooth cuts. I appreciate it has enough power for most jobs, but isn’t so heavy that it wears me out quickly.

Limitations:

While the MS 251 C-BE is a capable chainsaw, it does have its limitations. It’s not ideal for felling large trees or processing extremely dense hardwoods. For those tasks, a more powerful saw with a longer bar is recommended. Also, the plastic housing, while durable, is not as robust as the metal housings found on professional-grade chainsaws.

5 Pro Tips for Firewood Masters (Using the MS 251 C-BE)

Here are five tips I’ve learned over the years that will help you maximize your efficiency and safety when processing firewood with the Stihl MS 251 C-BE:

1. Chain Selection and Sharpening:

• The Right Chain Makes All the Difference: The MS 251 C-BE typically comes with a 3/8″ P (Picco) chain. I recommend using a low-kickback chain for added safety, especially if you’re a beginner. However, for faster cutting, consider a chisel chain, but be aware that it requires more skill to sharpen and is more prone to kickback.
• Sharpening is Key: A dull chain is not only inefficient, it’s also dangerous. A dull chain requires more force to cut, increasing the risk of kickback. I sharpen my chain every 2-3 hours of use, or more frequently if I’m cutting dirty or abrasive wood.
• Maintaining the Correct Angles: Use a chainsaw file and guide to maintain the correct cutting angles. The top plate angle should be around 60 degrees, and the side plate angle should be around 10 degrees. Incorrect angles will result in a dull or aggressive chain.
• Depth Gauge Adjustment: The depth gauges (rakers) control how much wood each cutter takes. If the depth gauges are too high, the chain will cut slowly. If they’re too low, the chain will grab and kickback. Use a depth gauge tool to maintain the correct depth gauge setting, typically around 0.025″ (0.635 mm).
• Data Point: A properly sharpened chain can cut through a 12-inch diameter log in approximately 10-15 seconds, while a dull chain may take 30 seconds or more.

2. Mastering the Bore Cut:

• The Bore Cut Technique: The bore cut is a technique used to fell trees and buck logs without pinching the bar. It involves plunging the tip of the bar into the wood and using the saw to create a narrow slot.
• How to Perform a Bore Cut: Start by making a face cut (undercut) on the log. Then, position the tip of the bar against the face cut and slowly plunge it into the wood. Once the bar is fully inserted, use the saw to create a slot that extends beyond the hinge wood.
• Benefits of the Bore Cut: The bore cut helps prevent pinching by creating a space for the wood to expand as it’s being cut. It also allows you to control the direction of the fall when felling trees.
• Safety Precautions: Always use extreme caution when performing a bore cut. Keep a firm grip on the saw and be aware of the potential for kickback. Never perform a bore cut above shoulder height.
• Case Study: I once used the bore cut to fell a leaning tree that was in danger of falling on a power line. By carefully controlling the direction of the fall, I was able to bring the tree down safely and avoid a potentially dangerous situation.

3. Optimizing Bucking Techniques:

• Proper Stance and Grip: Maintain a wide stance and keep both hands firmly on the saw. Avoid overreaching or twisting your body.
• Cutting Sequence: When bucking logs, start by making a relief cut on the opposite side of the log to prevent pinching. Then, complete the cut from the top.
• Using a Saw Buck: A saw buck is a valuable tool for supporting logs while you’re cutting them. It keeps the log off the ground and at a comfortable working height.
• Log Diameter and Cutting Time: The MS 251 C-BE is best suited for logs up to 16 inches in diameter. Cutting larger logs will take longer and put more strain on the saw.
• Data Point: A study by the USDA Forest Service found that using a saw buck can increase firewood processing efficiency by up to 25%.

4. Wood Selection and Seasoning:

• Hardwoods vs. Softwoods: Hardwoods like oak, maple, and ash are denser and burn longer than softwoods like pine, fir, and spruce. However, hardwoods also take longer to dry and can be more difficult to split.
• Moisture Content: The ideal moisture content for firewood is below 20%. Burning wood with a higher moisture content will result in less heat, more smoke, and increased creosote buildup in your chimney.
• Seasoning Process: Seasoning wood involves stacking it in a well-ventilated area and allowing it to dry for at least 6-12 months. The drying time will vary depending on the type of wood, the climate, and the stacking method.
• Wood Identification: Learn to identify different types of wood in your area. This will help you choose the best wood for your needs and avoid burning wood that is toxic or produces excessive smoke.
• Technical Requirement: Firewood should be stacked in rows that are at least 4 inches off the ground to promote air circulation. The rows should be oriented in the direction of the prevailing wind.

5. Safety First: Gear and Practices:

• Essential Safety Gear: Always wear a helmet with a face shield, hearing protection, chainsaw chaps, gloves, and sturdy boots when operating a chainsaw.
• Kickback Awareness: Kickback is a sudden and violent upward or backward movement of the saw that can cause serious injury. Be aware of the potential for kickback and take steps to avoid it.
• Safe Starting Procedures: Always start the chainsaw on the ground, with the chain brake engaged. Never drop-start the saw.
• Regular Maintenance: Keep your chainsaw in good working condition by performing regular maintenance, including cleaning the air filter, checking the chain tension, and lubricating the bar and chain.
• Emergency Preparedness: Have a first-aid kit readily available and know how to use it. In case of an accident, remain calm and call for help immediately.
• Industry Standard: OSHA (Occupational Safety and Health Administration) requires that all chainsaw operators receive proper training and wear appropriate personal protective equipment (PPE).

Maintenance and Longevity

To ensure the Stihl MS 251 C-BE serves you well for years to come, regular maintenance is crucial.

• Air Filter Cleaning: Clean the air filter after every 5-10 hours of use. A clogged air filter restricts airflow and reduces engine performance.
• Spark Plug Inspection: Inspect the spark plug regularly and replace it if it’s fouled or damaged. A bad spark plug can cause starting problems and misfires.
• Chain Sharpening and Replacement: Sharpen the chain regularly and replace it when it’s worn out. A dull or worn chain is inefficient and dangerous.
• Bar and Chain Lubrication: Keep the bar and chain well-lubricated to prevent wear and overheating. Use a high-quality bar and chain oil.
• Fuel and Oil Mixture: Use the correct fuel and oil mixture as specified by the manufacturer. Using the wrong mixture can damage the engine. A 50:1 ratio using high-quality 2-cycle engine oil is generally recommended.
• Storage: When storing the chainsaw for extended periods, drain the fuel tank and run the engine until it stalls. This prevents fuel from gumming up the carburetor. Store the chainsaw in a dry place.

Troubleshooting Common Issues

Even with proper maintenance, you may encounter some common issues with the Stihl MS 251 C-BE. Here are some troubleshooting tips:

• Hard Starting: Check the spark plug, air filter, and fuel. Make sure the choke is properly engaged.
• Engine Stalling: Check the air filter, fuel filter, and carburetor. Make sure the fuel is fresh.
• Chain Not Oiling: Check the oil level and make sure the oiler is working properly. Clean the oiler ports if they’re clogged.
• Chain Binding: Check the chain tension and make sure the chain is properly sharpened.
• Overheating: Check the air filter, fuel mixture, and chain lubrication.

Alternatives to the Stihl MS 251 C-BE

While the Stihl MS 251 C-BE is an excellent chainsaw, there are other options to consider depending on your needs and budget.

• Stihl MS 170: A lighter and less expensive option for occasional use.
• Stihl MS 271 Farm Boss: A more powerful option for larger jobs and more frequent use.
• Husqvarna 455 Rancher: A comparable chainsaw to the MS 251 C-BE in terms of power and features.
• Echo CS-590 Timberwolf: A powerful and durable chainsaw that’s a good value for the price.

Conclusion: The Stihl MS 251 C-BE – A Reliable Choice

The Stihl MS 251 C-BE is a reliable and versatile chainsaw that’s well-suited for firewood processing and other tasks around the home or farm. Its combination of power, weight, and ease of use makes it a great choice for both beginners and experienced users. By following the tips and recommendations in this review, you can maximize the performance and longevity of your Stihl MS 251 C-BE and enjoy years of trouble-free service. Remember, safety always comes first. Always wear appropriate safety gear and follow safe operating procedures. With the right tool and the right knowledge, you can transform raw logs into a source of warmth and comfort for your home. Happy cutting!

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