Stihl MS 251 Wood Boss Chainsaw (5 Pro Tips for Peak Performance)

Have you ever wondered why some firewood burns like a dream, crackling merrily and radiating heat, while other wood just sulks in the grate, stubbornly refusing to catch and leaving you shivering? The secret, my friends, often lies in the proper use and care of your chainsaw, and in this case, specifically the Stihl MS 251 Wood Boss.

I’ve spent years wrestling with logs, splitting wood, and coaxing warmth from the forest’s bounty. I’ve seen firsthand how a well-maintained chainsaw, wielded with skill and respect, can be the difference between a productive day and a frustrating one. The Stihl MS 251 Wood Boss is a popular choice for homeowners and professionals alike, striking a balance between power, weight, and affordability. But even the best tool is only as good as the person using it. So, let’s dive into five pro tips that will help you unlock the full potential of your Stihl MS 251 and achieve peak performance in your wood processing endeavors.

Unleashing the Beast: 5 Pro Tips for Stihl MS 251 Wood Boss Peak Performance

The Stihl MS 251 Wood Boss is a fantastic piece of equipment, but like any tool, it requires proper care and technique to truly shine. These aren’t just tips I read in a manual; they’re hard-earned lessons learned through years of experience in the woods.

1. Sharpening: The Cornerstone of Cutting Efficiency

A dull chain is a dangerous chain. It’s also incredibly inefficient. A sharp chain bites into the wood, creating clean, effortless cuts. A dull chain, on the other hand, tears at the wood, requiring more force and increasing the risk of kickback.

Why Sharpening Matters:

• Safety: A sharp chain reduces the risk of kickback, a sudden and potentially violent upward or backward movement of the saw.
• Efficiency: A sharp chain cuts faster and requires less effort, saving you time and energy.
• Saw Longevity: A dull chain puts unnecessary strain on the engine and other components, shortening the lifespan of your saw.
• Fuel Efficiency: A sharp chain requires less engine power, resulting in better fuel economy.

The Sharpening Process (My Preferred Method):

I prefer using a file and guide for sharpening my chains. While a chainsaw sharpener can be quicker, I find that using a file gives me more control and allows me to maintain the correct angle and depth.

1. Secure the Saw: Clamp the bar in a vise to keep it stable.
2. Identify the Correct File Size: Consult your owner’s manual to determine the correct file size for your chain. Typically, the MS 251 uses a 5/32″ (4.0mm) file.
3. Use a File Guide: A file guide helps maintain the correct angle and depth. Position the guide on the chain so that the file is at the correct angle (usually 30 degrees) and the depth gauge is set correctly.
4. File Each Cutter: File each cutter from the inside out, using smooth, even strokes. Aim for 3-5 strokes per cutter.
5. Maintain Consistency: Ensure that all cutters are filed to the same length and angle. This is crucial for smooth, even cutting.
6. Lower the Depth Gauges (Rakers): After several sharpenings, the depth gauges (also known as rakers) may need to be lowered. Use a depth gauge tool and a flat file to lower them to the recommended height. This is critical for efficient chip removal.
7. Check Your Work: After sharpening, inspect the chain to ensure that all cutters are sharp and uniform.

Data Point: Studies have shown that a properly sharpened chainsaw can reduce cutting time by up to 30% compared to a dull chain.

Personal Story: I remember one time, I was helping a friend clear some trees after a storm. He was struggling with his chainsaw, making slow, ragged cuts. I offered to sharpen his chain, and after just a few minutes, his saw was cutting like a hot knife through butter. He was amazed at the difference, and we were able to finish the job much faster.

Unique Insight: Don’t wait until your chain is completely dull to sharpen it. Frequent touch-ups will keep your chain cutting efficiently and extend its lifespan. I usually sharpen my chain after every tank of gas, or more often if I’m cutting dirty or knotty wood.

2. Chain and Bar Maintenance: Extending the Lifeblood of Your Saw

The chain and bar are the heart and soul of your chainsaw. Proper maintenance is crucial for ensuring smooth, efficient cutting and preventing premature wear and tear.

Chain Maintenance:

• Chain Tension: Check the chain tension before each use. The chain should be snug against the bar, but you should still be able to pull it around the bar by hand. Too tight, and you’ll wear out the bar and chain prematurely. Too loose, and the chain can derail, posing a safety hazard.
• Chain Lubrication: Always use a high-quality bar and chain oil. Ensure that the oiler is functioning properly and that the chain is receiving adequate lubrication. Insufficient lubrication will cause the chain to overheat and wear out quickly. I prefer using a synthetic bar and chain oil, especially in colder weather, as it flows more readily and provides better protection.
• Chain Cleaning: After each use, clean the chain with a brush or rag to remove sawdust and debris. This will help prevent corrosion and ensure proper lubrication.

Bar Maintenance:

• Bar Cleaning: Clean the bar regularly with a brush or rag to remove sawdust and debris. Pay particular attention to the oil holes, ensuring that they are clear and unobstructed.
• Bar Filing: Check the bar for burrs and damage. Use a bar dressing tool to remove any burrs and restore the bar’s edges.
• Bar Flipping: Flip the bar regularly to distribute wear evenly. This will extend the lifespan of the bar.
• Bar Grinding: If the bar is severely damaged or worn, it may need to be ground. This is best left to a professional.

Data Point: A study by the US Forest Service found that proper chain and bar maintenance can extend the lifespan of these components by up to 50%.

Personal Story: I once neglected to properly lubricate my chain while cutting some particularly hard oak. The chain overheated and stretched, eventually breaking. The broken chain whipped around and damaged the bar, requiring me to replace both components. It was a costly and avoidable mistake that taught me the importance of proper lubrication.

Unique Insight: When storing your chainsaw for an extended period, remove the chain and bar and clean them thoroughly. Apply a light coat of oil to prevent corrosion. This will help ensure that your saw is ready to go when you need it.

3. Fuel and Oil: The Lifeblood of Your Engine

The Stihl MS 251, like most chainsaws, relies on a two-stroke engine, which requires a precise mixture of gasoline and oil. Using the correct fuel and oil mixture is crucial for engine performance and longevity.

Fuel Requirements:

• Octane Rating: Use gasoline with a minimum octane rating of 89. Higher octane fuels may provide slightly better performance, but they are not necessary.
• Ethanol Content: Use gasoline with an ethanol content of 10% or less. Ethanol can damage the fuel system and cause engine problems. I prefer using ethanol-free gasoline whenever possible, especially for long-term storage.
• Fuel Stabilizer: Add a fuel stabilizer to the gasoline, especially if you are not going to use the saw for an extended period. Fuel stabilizer will prevent the gasoline from breaking down and forming gum and varnish, which can clog the fuel system.

Oil Requirements:

• Two-Stroke Oil: Use a high-quality two-stroke oil specifically designed for air-cooled engines. Stihl recommends using their own brand of two-stroke oil, but other reputable brands are also acceptable.
• Mixing Ratio: Mix the gasoline and oil according to the manufacturer’s recommendations. The Stihl MS 251 typically requires a 50:1 mixing ratio (50 parts gasoline to 1 part oil). Using the wrong mixing ratio can damage the engine. Too much oil can cause excessive smoke and carbon buildup. Too little oil can lead to premature engine wear and failure.
• Mixing Procedure: Mix the gasoline and oil in a separate container, not directly in the fuel tank. This will ensure that the mixture is properly blended.

Data Point: Studies have shown that using the correct fuel and oil mixture can extend the lifespan of a two-stroke engine by up to 25%.

Personal Story: I once had a friend who was using the wrong type of oil in his chainsaw. He was using a four-stroke oil instead of a two-stroke oil. The engine quickly seized up, requiring a costly repair. This taught me the importance of using the correct type of oil and following the manufacturer’s recommendations.

Unique Insight: Always use fresh fuel. Gasoline can degrade over time, especially if it is stored improperly. I recommend using fuel within 30 days of purchase. If you are storing fuel for longer periods, add a fuel stabilizer and store it in a tightly sealed container in a cool, dark place.

4. Starting and Operating Techniques: Mastering the Art of the Cut

Proper starting and operating techniques are essential for ensuring safe and efficient chainsaw operation.

Starting Procedures:

• Cold Start: Engage the chain brake. Place the saw on the ground, with the bar pointing away from you. Activate the choke. Pull the starter rope until the engine fires, but does not start. Deactivate the choke. Pull the starter rope again until the engine starts. Allow the engine to warm up for a few minutes before using the saw.
• Warm Start: Engage the chain brake. Place the saw on the ground, with the bar pointing away from you. Do not activate the choke. Pull the starter rope until the engine starts.
• Flooded Engine: If the engine is flooded, remove the spark plug and dry it off. Pull the starter rope several times to clear the excess fuel from the cylinder. Reinstall the spark plug and try starting the engine again.

Operating Techniques:

• Stance: Maintain a stable stance with your feet shoulder-width apart. Keep your weight balanced and your knees slightly bent.
• Grip: Grip the saw firmly with both hands. Keep your thumbs wrapped around the handles.
• Cutting: Use the bottom of the bar for felling trees and bucking logs. Use the top of the bar for limbing branches.
• Push vs. Pull: Let the saw do the work. Don’t force the saw through the wood. Use a pushing motion for felling trees and a pulling motion for bucking logs.
• Kickback Zone: Be aware of the kickback zone, which is the upper quadrant of the bar tip. Avoid cutting with this area of the bar, as it is the most likely to cause kickback.
• Safety Gear: Always wear appropriate safety gear, including a helmet, eye protection, hearing protection, gloves, chaps, and steel-toed boots.

Data Point: According to the Consumer Product Safety Commission, approximately 36,000 people are treated in emergency rooms each year for chainsaw-related injuries.

Personal Story: I witnessed a near-fatal accident when a friend was felling a tree. He was cutting with the kickback zone of the bar, and the saw kicked back violently, striking him in the head. Fortunately, he was wearing a helmet, which saved his life. This experience reinforced the importance of using proper cutting techniques and wearing appropriate safety gear.

Unique Insight: Practice makes perfect. Start with small, manageable projects and gradually work your way up to larger, more complex tasks. Consider taking a chainsaw safety course to learn proper techniques and gain experience under the guidance of a qualified instructor.

5. Troubleshooting and Maintenance: Keeping Your Saw Running Smoothly

Even with proper care and maintenance, chainsaws can sometimes experience problems. Knowing how to troubleshoot common issues and perform basic maintenance tasks can save you time and money.

Common Problems:

• Engine Won’t Start: Check the fuel level, spark plug, and air filter. Ensure that the choke is properly engaged and disengaged.
• Engine Runs Rough: Check the fuel mixture, spark plug, and air filter. Clean the carburetor if necessary.
• Chain Won’t Oil: Check the oil level and the oiler. Clean the oil holes in the bar.
• Chain Binds: Check the chain tension and sharpness. Ensure that the bar is properly lubricated.
• Excessive Vibration: Check the chain tension and sharpness. Inspect the bar for damage. Check the engine mounts.

Basic Maintenance Tasks:

• Spark Plug Replacement: Replace the spark plug annually or as needed. Use the correct type of spark plug for your chainsaw.
• Air Filter Cleaning: Clean the air filter regularly with soap and water. Replace the air filter annually or as needed.
• Fuel Filter Replacement: Replace the fuel filter annually or as needed.
• Carburetor Adjustment: The carburetor may need to be adjusted periodically to ensure proper engine performance. This is best left to a qualified technician.

Data Point: Regular maintenance can prevent up to 80% of chainsaw-related problems.

Personal Story: I once had a chainsaw that was running rough and losing power. I checked the spark plug and found that it was fouled with carbon. I replaced the spark plug, and the saw ran like new again. This simple fix saved me a trip to the repair shop and a costly repair bill.

Unique Insight: Keep a maintenance log to track when you perform various maintenance tasks. This will help you stay on top of your chainsaw’s maintenance schedule and prevent problems before they occur.

Beyond the Basics: Advanced Tips for the Discerning Woodworker

Now that we’ve covered the essential tips for maximizing the performance of your Stihl MS 251 Wood Boss, let’s delve into some more advanced techniques that can take your wood processing skills to the next level.

Wood Species Selection: Knowing Your Enemy (and Your Friend)

Different wood species have different properties that affect their suitability for various applications. Understanding these properties can help you choose the right wood for your project and optimize your processing techniques.

• Hardness: Hardwoods, such as oak, maple, and hickory, are denser and more durable than softwoods, such as pine, fir, and cedar. Hardwoods are typically used for furniture, flooring, and other applications that require strength and durability. Softwoods are typically used for construction, framing, and other applications where weight is a concern.
• Density: Density affects the weight and strength of the wood. Denser woods are heavier and stronger.
• Moisture Content: The moisture content of wood affects its weight, strength, and stability. Green wood has a high moisture content, while seasoned wood has a low moisture content. Green wood is easier to cut, but it is also more likely to warp and crack as it dries. Seasoned wood is more stable, but it is also more difficult to cut.
• Grain: The grain of wood affects its appearance and workability. Straight-grained woods are easier to cut and split than woods with irregular grain.
• Resin Content: Some woods, such as pine and fir, have a high resin content. Resin can clog saw blades and make it difficult to finish the wood.

Data Point: Oak has a Janka hardness rating of 1290 lbf, while pine has a Janka hardness rating of 380 lbf. This means that oak is more than three times as hard as pine.

Unique Insight: When selecting wood for firewood, choose hardwoods over softwoods. Hardwoods burn longer and produce more heat. Oak, maple, and hickory are all excellent choices for firewood. Avoid burning green wood, as it produces less heat and more smoke.

Felling Techniques: Mastering the Art of Taking Down a Tree

Felling a tree is a dangerous task that should only be attempted by experienced individuals. Proper felling techniques are essential for ensuring safety and preventing damage to the tree and its surroundings.

• Planning: Before felling a tree, carefully assess the situation. Consider the tree’s size, lean, and condition. Identify any obstacles in the tree’s path, such as power lines, buildings, or other trees. Develop a felling plan that minimizes the risk of injury or damage.
• Clearance: Clear the area around the tree of any obstacles. Remove any brush, rocks, or other debris that could trip you or interfere with your swing.
• Notch Cut: Cut a notch in the side of the tree facing the direction you want it to fall. The notch should be about one-third of the tree’s diameter.
• Back Cut: Cut a back cut on the opposite side of the tree, slightly above the notch. Leave a hinge of wood between the notch and the back cut. The hinge will help control the direction of the fall.
• Wedge: Insert a wedge into the back cut to help push the tree over.
• Felling: Stand clear of the tree and watch as it falls. Be prepared to move quickly if the tree falls in an unexpected direction.

Data Point: According to the National Institute for Occupational Safety and Health (NIOSH), logging is one of the most dangerous occupations in the United States.

Unique Insight: Never fell a tree alone. Always have a spotter present to watch for hazards and assist you if needed.

Splitting Techniques: From Log to Firewood with Ease

Splitting wood can be a physically demanding task, but with the right techniques and tools, it can be made easier and more efficient.

• Axe Selection: Choose an axe that is appropriate for the size and type of wood you are splitting. A maul is a heavier axe that is designed for splitting large logs. A splitting axe is lighter and more maneuverable, making it ideal for splitting smaller logs.
• Stance: Maintain a stable stance with your feet shoulder-width apart. Keep your weight balanced and your knees slightly bent.
• Swing: Swing the axe with a smooth, controlled motion. Aim for the center of the log.
• Wedge: If the axe gets stuck in the log, use a wedge to split it apart.
• Safety: Always wear appropriate safety gear, including eye protection, gloves, and steel-toed boots.

Data Point: A seasoned wood splitter can split up to one cord of wood per day.

Unique Insight: Split wood when it is green. Green wood is easier to split than seasoned wood.

Conclusion: Mastering the Wood Boss and the Art of Wood Processing

The Stihl MS 251 Wood Boss is a versatile and reliable chainsaw that can be a valuable asset for any wood processing project. By following these pro tips and mastering the art of wood processing, you can unlock the full potential of your saw and achieve peak performance. Remember that safety is paramount, and always prioritize proper techniques and safety gear. With practice and dedication, you can become a skilled woodworker and enjoy the satisfaction of transforming raw logs into beautiful and functional products.

From sharpening your chain with precision to understanding the nuances of different wood species, each aspect of wood processing plays a critical role in the final outcome. So, embrace the challenge, learn from your experiences, and never stop striving to improve your skills. The forest awaits, and with your Stihl MS 251 Wood Boss by your side, you’re ready to tackle any wood processing project that comes your way. Now, go forth and conquer those logs!

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