Stihl 251 Wood Boss Chainsaw (5 Pro Tips for Longevity)
The Stihl 251 Wood Boss is a workhorse, no doubt, but even the best machines need a little TLC to keep them running strong. I’ve spent years felling trees, bucking logs, and prepping firewood, and I’ve learned a thing or two about keeping my chainsaws in tip-top shape. Let me share my hard-earned wisdom so you can maximize the lifespan of your Stihl 251 Wood Boss.
Understanding Your Stihl 251 Wood Boss
Before we dive into the pro tips, let’s take a moment to appreciate what makes the Stihl 251 Wood Boss a popular choice for homeowners and small-scale loggers. This chainsaw is known for its combination of power, ease of use, and reliability. It’s a mid-range saw, ideal for tackling a variety of tasks from pruning and limbing to felling small trees and cutting firewood.
Key Features and Specifications
- Engine: The Stihl 251 Wood Boss typically features a 45.6 cc engine, providing ample power for most common tasks.
- Bar Length: It’s usually equipped with a 16-inch or 18-inch bar, offering a good balance between maneuverability and cutting capacity.
- Weight: Weighing in around 10.1 pounds (without fuel and bar), it’s light enough to handle for extended periods without excessive fatigue.
- Fuel Capacity: The fuel tank holds approximately 15.9 ounces, allowing for decent run times between refills.
- Oil Capacity: The oil tank capacity is about 7.1 ounces, ensuring adequate chain lubrication.
Why Longevity Matters
Investing in a chainsaw is a significant expense, and extending its lifespan is crucial for getting the most value out of your investment. Proper maintenance not only prevents costly repairs but also ensures the saw operates safely and efficiently. Think of it this way: a well-maintained chainsaw is like a finely tuned instrument – it performs better, lasts longer, and makes your work easier.
Pro Tip #1: Mastering Fuel Management
Fuel is the lifeblood of your chainsaw, and using the right type and maintaining its quality are essential for longevity. I’ve seen countless saws fail prematurely due to poor fuel practices.
Using the Right Fuel Mix
The Stihl 251 Wood Boss, like most two-stroke engines, requires a precise mixture of gasoline and oil. Stihl recommends a 50:1 ratio, meaning 50 parts gasoline to 1 part two-stroke oil. Using the wrong ratio can lead to serious engine damage. Too little oil results in inadequate lubrication, causing excessive wear and potential seizure. Too much oil can lead to carbon buildup, reducing performance and potentially clogging the exhaust port.
Data Point: According to a study by the American Society of Agricultural and Biological Engineers (ASABE), using the correct fuel-to-oil ratio can extend the lifespan of a two-stroke engine by up to 30%.
Choosing the Right Gasoline
Use only high-quality gasoline with an octane rating of 89 or higher. Avoid gasoline containing ethanol whenever possible. Ethanol can absorb moisture, leading to fuel separation and corrosion of engine components. If you must use gasoline containing ethanol, ensure it’s fresh and use a fuel stabilizer to prevent degradation.
Personal Experience: I once made the mistake of using old gasoline in my chainsaw, and it resulted in a clogged carburetor and a frustrating day of troubleshooting. Now, I always use fresh fuel and add a fuel stabilizer, especially when storing the saw for extended periods.
Storing Fuel Properly
Proper fuel storage is just as important as using the right fuel mix. Store gasoline in a clean, airtight container approved for fuel storage. Keep the container in a cool, dry place away from direct sunlight and heat sources. Avoid storing fuel for more than 30 days, as it can degrade over time.
Actionable Advice: Label your fuel containers clearly with the date of purchase. This helps you keep track of how long the fuel has been stored and ensures you’re using fresh gasoline.
The Importance of Fuel Stabilizers
Fuel stabilizers are additives that help prevent fuel degradation and keep your engine running smoothly. They work by preventing oxidation and the formation of gum and varnish in the fuel system. I highly recommend using a fuel stabilizer, especially if you don’t use your chainsaw frequently.
Comparison: I’ve tested several fuel stabilizers over the years, and I’ve found that Stihl Ultra HP and STA-BIL Storage Fuel Stabilizer are among the best. They provide excellent protection against fuel degradation and keep my chainsaw running smoothly, even after months of storage.
Pro Tip #2: Mastering Chain and Bar Maintenance
The chain and bar are the cutting heart of your chainsaw. Proper maintenance ensures efficient cutting, reduces wear and tear on the engine, and enhances safety. I can’t stress enough how important it is to keep your chain sharp and your bar in good condition.
Sharpening Your Chain
A sharp chain is essential for efficient cutting and safety. A dull chain requires more force to cut, increasing the risk of kickback and putting unnecessary strain on the engine. Sharpen your chain regularly, ideally after every few hours of use.
Data Point: A study by the Forest Engineering Research Institute of Canada (FERIC) found that using a sharp chain can increase cutting productivity by up to 20% and reduce fuel consumption by 10%.
Methods for Sharpening
- Hand Filing: This is the most common method for sharpening chainsaw chains. It involves using a round file and a file guide to sharpen each cutter individually.
- Electric Sharpeners: These sharpeners use a grinding wheel to sharpen the chain quickly and accurately. They are a good option for those who sharpen chains frequently.
- Professional Sharpening: If you’re not comfortable sharpening your chain yourself, you can take it to a professional sharpening service.
Detailed Comparison:
| Method | Pros | Cons |
|---|---|---|
| Hand Filing | Inexpensive, portable, allows for precise sharpening | Requires practice and skill, can be time-consuming |
| Electric Sharpeners | Fast, accurate, consistent results | More expensive, requires a power source, can overheat the chain |
| Professional | Convenient, guarantees a sharp chain | Most expensive option, requires taking the chain to a service provider |
Actionable Advice: Invest in a good quality chainsaw sharpening kit. It should include a round file, a flat file, a file guide, and a depth gauge tool.
Maintaining the Bar
The bar supports the chain and guides it through the cut. Proper maintenance ensures smooth operation and prevents premature wear.
- Cleaning: Clean the bar regularly with a wire brush to remove sawdust and debris.
- Lubrication: Ensure the bar is properly lubricated. The Stihl 251 Wood Boss has an automatic oiler, but you should still check the oil level frequently.
- Flipping: Flip the bar regularly to ensure even wear on both sides.
- Deburring: Remove any burrs or sharp edges from the bar rails using a flat file.
- Checking for Wear: Inspect the bar regularly for signs of wear, such as uneven rails or a bent bar. Replace the bar if it’s damaged or excessively worn.
Personal Experience: I once neglected to flip my chainsaw bar, and it resulted in uneven wear and a bent bar. Now, I make it a habit to flip the bar every time I sharpen the chain.
Chain Tension
Proper chain tension is crucial for safe and efficient cutting. A chain that is too loose can derail, while a chain that is too tight can bind and cause excessive wear.
- Checking Tension: Check the chain tension regularly, especially when the chain is new. The chain should be snug against the bar but should still be able to be pulled around the bar by hand.
- Adjusting Tension: Adjust the chain tension using the chain tensioning screw on the side of the chainsaw. Loosen the bar nuts slightly before adjusting the tension, and then tighten them securely after the adjustment.
Pro Tip #3: Air Filter Maintenance
A clean air filter is essential for proper engine performance. A clogged air filter restricts airflow, causing the engine to run rich and reducing power. I’ve seen chainsaws lose significant power due to neglected air filters.
Importance of Clean Air Filter
The air filter prevents dust and debris from entering the engine. A clogged air filter restricts airflow, causing the engine to run rich (too much fuel and not enough air). This can lead to reduced power, poor fuel economy, and increased emissions.
Data Point: According to a study by the Engine Manufacturers Association (EMA), a clogged air filter can reduce engine power by up to 10%.
Cleaning the Air Filter
Clean the air filter regularly, ideally after every 5 to 10 hours of use, depending on the conditions.
- Removing the Filter: Remove the air filter cover and carefully remove the filter.
- Cleaning Methods:
- Compressed Air: Use compressed air to blow out the dirt and debris from the filter. Blow from the inside out to avoid forcing dirt deeper into the filter.
- Washing: Wash the filter in warm, soapy water. Rinse thoroughly and allow it to air dry completely before reinstalling.
- Inspection: Inspect the filter for damage, such as tears or holes. Replace the filter if it’s damaged.
Comparison:
| Method | Pros | Cons |
|---|---|---|
| Compressed Air | Quick, easy, effective for removing loose dirt and debris | May not remove all embedded dirt, requires a compressor |
| Washing | Removes embedded dirt and debris, thorough cleaning | Time-consuming, requires drying time, can damage delicate filters |
Actionable Advice: Keep a spare air filter on hand so you can replace the dirty filter immediately and continue working.
Types of Air Filters
The Stihl 251 Wood Boss typically uses a foam or felt air filter. Foam filters are washable and reusable, while felt filters may need to be replaced more frequently.
Detailed Comparison:
| Filter Type | Pros | Cons |
|---|---|---|
| Foam | Washable, reusable, durable | Can be more difficult to clean thoroughly, requires oiling after washing |
| Felt | Inexpensive, easy to replace, good filtration | Not washable, needs to be replaced more frequently |
Pro Tip #4: Spark Plug Maintenance
The spark plug ignites the fuel-air mixture in the engine, and a faulty spark plug can cause starting problems, misfires, and reduced power. I always keep a spare spark plug on hand, just in case.
Importance of a Good Spark Plug
The spark plug is responsible for igniting the fuel-air mixture in the engine. A faulty spark plug can cause starting problems, misfires, and reduced power.
Data Point: According to a study by the Society of Automotive Engineers (SAE), a worn spark plug can reduce fuel economy by up to 30%.
Inspecting the Spark Plug
Inspect the spark plug regularly, ideally every 25 hours of use.
- Removing the Spark Plug: Remove the spark plug wire and use a spark plug wrench to remove the spark plug.
- Visual Inspection: Inspect the spark plug for signs of wear, such as a cracked insulator, worn electrodes, or carbon buildup.
- Electrode Gap: Check the electrode gap using a spark plug gap tool. The correct gap for the Stihl 251 Wood Boss is typically around 0.020 inches.
Actionable Advice: Use a spark plug gap tool to ensure the electrode gap is correct. An incorrect gap can cause poor engine performance.
Cleaning the Spark Plug
If the spark plug is dirty but otherwise in good condition, you can clean it using a wire brush or a spark plug cleaner.
- Wire Brush: Use a wire brush to remove carbon buildup from the electrodes.
- Spark Plug Cleaner: A spark plug cleaner uses compressed air and abrasive media to clean the spark plug quickly and effectively.
Comparison:
| Method | Pros | Cons |
|---|---|---|
| Wire Brush | Inexpensive, easy to use | May not remove all carbon buildup, can damage delicate electrodes |
| Spark Plug Cleaner | Fast, effective, removes stubborn carbon buildup | More expensive, requires a compressor, can be messy |
Replacing the Spark Plug
Replace the spark plug if it’s worn, damaged, or excessively fouled. Use the correct spark plug for the Stihl 251 Wood Boss, typically a NGK BPMR7A or equivalent.
Personal Experience: I once had a chainsaw that was difficult to start, and it turned out to be a faulty spark plug. Replacing the spark plug solved the problem immediately.
Pro Tip #5: Proper Storage
Proper storage is crucial for preventing damage and extending the lifespan of your chainsaw. I’ve seen chainsaws rust and corrode due to improper storage.
Cleaning Before Storage
Before storing your chainsaw, clean it thoroughly to remove sawdust, debris, and oil.
- Cleaning the Saw: Use a brush and compressed air to clean the saw.
- Cleaning the Bar and Chain: Remove the bar and chain and clean them separately.
- Emptying the Fuel Tank: Empty the fuel tank to prevent fuel degradation.
Actionable Advice: Use a carburetor cleaner to clean the carburetor before storing the chainsaw. This helps prevent fuel deposits from forming in the carburetor.
Oiling the Bar and Chain
Apply a light coat of oil to the bar and chain to prevent rust and corrosion.
- Bar Oil: Use a good quality bar oil to lubricate the bar and chain.
- Application: Apply the oil liberally to the bar and chain.
Storing in a Dry Place
Store the chainsaw in a dry, well-ventilated place to prevent rust and corrosion.
- Case: Store the chainsaw in a case or cover to protect it from dust and debris.
- Location: Avoid storing the chainsaw in a damp basement or shed.
Long-Term Storage
If you’re storing the chainsaw for an extended period, take extra precautions to prevent damage.
- Fuel Stabilizer: Add fuel stabilizer to the fuel tank before storing the chainsaw.
- Spark Plug: Remove the spark plug and pour a small amount of oil into the cylinder. Pull the starter cord a few times to distribute the oil. Replace the spark plug.
- Battery: If your chainsaw has a battery, remove it and store it separately in a cool, dry place.
Personal Experience: I once stored my chainsaw in a damp shed, and it resulted in rust and corrosion. Now, I always store my chainsaw in a dry, well-ventilated place.
Wood Anatomy and Properties
Understanding the properties of wood is crucial for efficient and safe chainsaw operation. Different types of wood have different densities, moisture contents, and grain patterns, which can affect cutting performance.
Hardwood vs. Softwood
Hardwoods come from deciduous trees (trees that lose their leaves in the fall), while softwoods come from coniferous trees (trees that have needles and cones). Hardwoods are generally denser and more difficult to cut than softwoods.
Detailed Comparison:
| Feature | Hardwood | Softwood |
|---|---|---|
| Density | Higher | Lower |
| Cutting Difficulty | More difficult | Easier |
| Uses | Furniture, flooring, high-quality firewood | Construction, paper, less expensive firewood |
| Examples | Oak, maple, cherry, walnut | Pine, fir, spruce, cedar |
Moisture Content
The moisture content of wood affects its weight, density, and burning properties. Freshly cut wood can have a moisture content of 50% or higher, while seasoned firewood should have a moisture content of 20% or less.
Data Point: According to the U.S. Department of Energy, seasoned firewood produces up to 25% more heat than green firewood.
Grain Patterns
The grain pattern of wood affects its strength and splitting characteristics. Straight-grained wood is easier to split than wood with knots or twisted grain.
Actionable Advice: When splitting firewood, try to split along the grain to make the process easier.
Logging Tool Selection and Maintenance Best Practices
Choosing the right logging tools and maintaining them properly is essential for safe and efficient wood processing.
Axes and Wedges
Axes and wedges are used for splitting firewood and felling trees.
- Axes: Choose an axe that is appropriate for the size of the wood you’re splitting. A splitting axe has a wider head than a felling axe.
- Wedges: Use wedges to split large logs that are difficult to split with an axe alone.
Detailed Comparison:
| Tool | Pros | Cons |
|---|---|---|
| Splitting Axe | Effective for splitting small to medium-sized logs | Can be tiring for extended use, not suitable for large logs |
| Wedges | Effective for splitting large logs, reduces strain on the axe | Requires additional tools (sledgehammer), can be time-consuming |
Sledgehammers
Sledgehammers are used to drive wedges into logs.
- Weight: Choose a sledgehammer with a weight that you can comfortably swing for extended periods.
- Handle: Choose a sledgehammer with a durable handle that provides a good grip.
Log Splitters
Log splitters are used to split firewood quickly and easily.
- Manual Log Splitters: These splitters use manual force to split the wood.
- Hydraulic Log Splitters: These splitters use hydraulic power to split the wood.
Detailed Comparison:
| Tool | Pros | Cons |
|---|---|---|
| Manual Log Splitter | Inexpensive, portable, no fuel or electricity required | Requires significant physical effort, slower than hydraulic splitters |
| Hydraulic Log Splitter | Fast, efficient, requires less physical effort | More expensive, requires fuel or electricity, less portable |
Maintenance Best Practices
- Sharpening: Keep your axes and wedges sharp to make splitting easier and safer.
- Cleaning: Clean your tools regularly to remove dirt and debris.
- Lubrication: Lubricate moving parts to prevent rust and corrosion.
- Storage: Store your tools in a dry place to prevent rust and corrosion.
Firewood Seasoning Techniques and Safety Considerations
Properly seasoning firewood is essential for efficient burning and reducing creosote buildup in your chimney.
Seasoning Process
Seasoning firewood involves drying the wood to reduce its moisture content. This makes the wood easier to ignite, burn hotter, and produce less smoke.
- Splitting: Split the firewood into smaller pieces to increase the surface area for drying.
- Stacking: Stack the firewood in a single row, with the bark side up.
- Location: Choose a sunny, well-ventilated location for stacking the firewood.
- Time: Allow the firewood to season for at least six months, or preferably a year.
Data Point: According to the Chimney Safety Institute of America (CSIA), burning unseasoned firewood can increase creosote buildup in your chimney, which can lead to chimney fires.
Safety Considerations
- Personal Protective Equipment: Wear safety glasses, gloves, and hearing protection when processing firewood.
- Safe Stacking: Stack firewood carefully to prevent it from collapsing.
- Fire Safety: Keep a fire extinguisher nearby when burning firewood.
- Carbon Monoxide: Install a carbon monoxide detector in your home to protect against carbon monoxide poisoning.
Project Planning and Execution
Planning your wood processing projects carefully can help you work more efficiently and safely.
Assessing Your Needs
- Amount of Firewood: Determine how much firewood you need for the winter.
- Wood Source: Identify a reliable source of wood.
- Tools and Equipment: Gather the necessary tools and equipment.
- Workspace: Prepare a safe and organized workspace.
Creating a Timeline
- Seasoning Time: Factor in the time required to season the firewood.
- Processing Time: Estimate how long it will take to process the wood.
- Storage Space: Ensure you have enough space to store the seasoned firewood.
Executing the Project
- Safety First: Always prioritize safety when working with chainsaws and other logging tools.
- Efficient Techniques: Use efficient techniques to maximize productivity.
- Regular Maintenance: Maintain your tools and equipment regularly.
- Enjoy the Process: Wood processing can be a rewarding and enjoyable activity.
Case Studies
Let’s look at a couple of real-world examples to illustrate the importance of proper chainsaw maintenance and wood processing techniques.
Case Study 1: The Neglected Chainsaw
A homeowner purchased a Stihl 251 Wood Boss and used it for several years without performing any maintenance. The chainsaw eventually became difficult to start and lost power. Upon inspection, it was found that the air filter was completely clogged, the spark plug was fouled, and the chain was dull. The homeowner had to spend a significant amount of money to repair the chainsaw.
Lessons Learned: Regular maintenance is essential for preventing costly repairs and extending the lifespan of your chainsaw.
Case Study 2: The Efficient Firewood Processor
A small-scale logger used a combination of efficient techniques and well-maintained tools to process firewood. He started by selecting high-quality wood with straight grain. He then used a sharp chainsaw to buck the logs into manageable lengths. He used a hydraulic log splitter to split the wood quickly and easily. Finally, he stacked the firewood in a sunny, well-ventilated location to allow it to season properly.
Lessons Learned: Efficient techniques and well-maintained tools can significantly increase productivity and reduce the amount of time required to process firewood.
Conclusion: Ensuring a Long Life for Your Stihl 251 Wood Boss
By following these five pro tips, you can significantly extend the lifespan of your Stihl 251 Wood Boss chainsaw and ensure it performs reliably for years to come. Remember, proper fuel management, chain and bar maintenance, air filter maintenance, spark plug maintenance, and proper storage are all crucial for keeping your chainsaw in top condition. Now, go out there, put these tips into practice, and enjoy the satisfaction of working with a well-maintained and efficient chainsaw. It’s not just about the tool; it’s about the pride in craftsmanship and the knowledge that you’re getting the most out of your investment. So, keep that chain sharp, the fuel fresh, and your Wood Boss will keep you cutting!
