Stihl 251 Wood Boss Bars (5 Key Woodcutting Insights)

The crisp autumn air bit at my cheeks as I wrestled a particularly stubborn oak log onto the splitter. The scent of freshly cut wood, a familiar perfume in my world, filled the air. It was firewood season, and like clockwork, my thoughts turned to the economics of it all. How much would this wood yield? What would my costs be? And most importantly, was I actually making money, or just enjoying a really expensive workout? This year, the project was fueled by a new addition to my arsenal: the Stihl MS 251 Wood Boss.

I remember vividly when I decided to upgrade. My old saw, bless its heart, was sputtering and straining with every cut. It was costing me more in time and frustration than it was worth. The Stihl 251 promised power, efficiency, and reliability – all key ingredients for a profitable and enjoyable wood-cutting season. But the bar, that critical piece of steel guiding the chain, is where the rubber meets the wood, quite literally. Choosing the right bar, and understanding its impact on performance and cost, became my obsession.

Stihl 251 Wood Boss Bars: 5 Key Woodcutting Insights

The Stihl MS 251 Wood Boss is a popular choice for homeowners and occasional users due to its balance of power and affordability. However, maximizing its potential requires understanding the nuances of bar selection. Here are five key insights I’ve gained through years of hands-on experience:

1. Understanding Bar Length and its Impact on Wood Size and Cost

The length of the bar dictates the maximum diameter of wood you can safely and efficiently cut. While it might be tempting to go for the longest possible bar, bigger isn’t always better.

• The Trade-off: A longer bar allows you to tackle larger logs, but it also requires more power from the saw. This can bog down the engine, especially with harder woods. Furthermore, longer bars are heavier and can make the saw more difficult to maneuver, increasing fatigue and potentially leading to less precise cuts.
• My Experience: I initially opted for an 18-inch bar, thinking I’d be prepared for anything. While it handled most tasks, I quickly realized it was overkill for smaller firewood. Switching to a 16-inch bar for those smaller jobs significantly improved the saw’s performance and my own efficiency.
• Data-Driven Recommendations: The Stihl MS 251 is typically recommended with bar lengths ranging from 16 to 18 inches. For most firewood cutting and general property maintenance, a 16-inch bar is ideal. If you regularly encounter logs over 14 inches in diameter, then an 18-inch bar might be a better choice.
• Cost Considerations: Longer bars are generally more expensive. A Stihl Rollomatic E Light 04 bar in 16-inch might cost around $60-$70, while the 18-inch version could be $70-$85. This may seem like a small difference, but it adds up over time, especially if you factor in the increased wear and tear on the saw from using a bar that’s too long for the job.
• Beyond Initial Cost: Consider the long-term cost. A properly sized bar reduces stress on the saw, extending its lifespan and reducing the need for repairs. It also improves fuel efficiency, saving you money on gas.

2. Bar Type Matters: Rollomatic E vs. Ematic

Stihl offers several types of bars, each with its own advantages and disadvantages. For the MS 251, the two most common options are the Rollomatic E and the Ematic.

• Rollomatic E: This is Stihl’s standard bar, known for its durability and versatility. It features a replaceable sprocket nose, which reduces wear and tear and extends the life of the bar. This is crucial, as the nose of the bar experiences the most friction and heat.
• Ematic: This bar is designed to reduce oil consumption. It features a unique oil channel that directs oil directly to the chain, minimizing waste. While this sounds great in theory, in my experience, the Ematic bar can sometimes be prone to clogging, especially when cutting resinous woods.
• My Experience: I’ve used both types of bars extensively. While I appreciate the oil-saving benefits of the Ematic, I ultimately prefer the Rollomatic E for its reliability and durability. The replaceable sprocket nose is a game-changer, as it allows me to extend the life of the bar significantly.
• Data-Driven Comparison: | Feature | Rollomatic E | Ematic | | —————— | ———————– | ——————— | | Durability | Excellent | Good | | Oil Consumption | Standard | Reduced | | Replaceable Nose | Yes | No | | Maintenance | Low | Moderate (clogging) | | Ideal Use Case | General woodcutting | Focus on oil saving |
• Cost Analysis: Rollomatic E bars tend to be slightly more expensive upfront, but the replaceable sprocket nose can save you money in the long run. A replacement sprocket nose typically costs around $15-$20, which is significantly less than replacing the entire bar.
• The Sprocket Nose Advantage: Replacing the sprocket nose is a simple process that can be done with basic tools. It’s a cost-effective way to maintain your bar and ensure optimal performance. I typically replace mine every 2-3 years, depending on usage.

3. Chain Selection: Matching the Chain to the Bar and Wood Type

The chain is just as important as the bar. Choosing the right chain can significantly impact cutting speed, efficiency, and the quality of the cut.

• Chain Types: Stihl offers a variety of chains, each designed for specific applications. Common options for the MS 251 include:
  • Rapid Micro (RM): A low-vibration chain designed for general woodcutting. It’s a good all-around choice for firewood and property maintenance.
  • Rapid Super (RS): A more aggressive chain designed for faster cutting. It’s ideal for experienced users who prioritize speed and efficiency.
  • Picco Micro (PM): A narrow-kerf chain designed for lighter-duty tasks. It’s a good choice for limbing and smaller branches.
• My Experience: I’ve found that the Rapid Micro (RM) chain is the best all-around choice for my needs. It provides a good balance of cutting speed, durability, and ease of sharpening. I’ve also experimented with the Rapid Super (RS) chain, but I found that it required more frequent sharpening and was more prone to kickback.
• Data-Driven Recommendations:
  • For general firewood cutting and property maintenance: Stihl Rapid Micro (RM)
  • For faster cutting (experienced users only): Stihl Rapid Super (RS)
  • For limbing and smaller branches: Stihl Picco Micro (PM)
• Cost Considerations: Chain prices vary depending on the type and length. A 16-inch Rapid Micro (RM) chain typically costs around $25-$35, while a Rapid Super (RS) chain might be $30-$40.
• Sharpening is Key: Regardless of the chain you choose, proper sharpening is essential for optimal performance and safety. A dull chain is not only inefficient, but it can also be dangerous. I recommend sharpening your chain every few hours of use, or whenever you notice a decrease in cutting speed. I use a Stihl chainsaw sharpener, but hand filing is also a viable option.
• Chain Gauge and Pitch: It’s crucial to ensure that the chain you choose is compatible with your bar. The gauge (the thickness of the drive links) and the pitch (the distance between the rivets) must match the specifications of the bar. The Stihl MS 251 typically uses a .050″ gauge and a 3/8″ pitch chain.

4. Maintenance: Extending the Life of Your Bar and Chain

Proper maintenance is crucial for maximizing the lifespan of your bar and chain and ensuring optimal performance. Neglecting maintenance can lead to premature wear and tear, increased costs, and even safety hazards.

• Cleaning: After each use, clean your bar and chain with a brush and solvent to remove sawdust, sap, and other debris. This helps prevent corrosion and ensures proper lubrication.
• Lubrication: Regularly check the oil level and ensure that the bar and chain are properly lubricated. Insufficient lubrication can lead to excessive friction and heat, which can damage the bar and chain.
• Filing the Bar: Periodically file the bar to remove burrs and restore the edges of the rails. This ensures that the chain runs smoothly and prevents premature wear.
• Chain Tension: Check the chain tension regularly and adjust as needed. A chain that is too loose can derail, while a chain that is too tight can overheat and damage the bar and chain.
• My Experience: I’ve learned the hard way that neglecting maintenance can be costly. I once neglected to clean my bar after cutting some particularly sappy pine, and the sap hardened and clogged the oiler. This led to excessive friction and heat, which damaged the bar and chain. Now, I make it a habit to clean and lubricate my bar and chain after every use.
• Data-Driven Recommendations:
  • Cleaning: After each use.
  • Lubrication: Check oil level before each use, and refill as needed.
  • Filing the Bar: Every 10-20 hours of use, or whenever you notice burrs or damage.
  • Chain Tension: Before each use, and periodically during use.
• Cost Savings: Proper maintenance can significantly extend the life of your bar and chain, saving you money in the long run. A well-maintained bar can last for several years, while a neglected bar might only last for a few months.
• The Importance of Oil: Use a high-quality bar and chain oil specifically designed for chainsaws. Avoid using motor oil or other substitutes, as they may not provide adequate lubrication and can damage the bar and chain. I prefer Stihl’s bar and chain oil, but there are other good options available.

5. Cost Optimization: Budgeting for Bar and Chain Expenses

Woodcutting can be an expensive hobby or profession. Understanding the costs associated with bars and chains is essential for effective budgeting and cost optimization.

• Initial Investment: The initial cost of a Stihl MS 251 and a bar and chain can range from $400 to $600, depending on the bar type, chain type, and retailer.
• Replacement Costs: Be prepared to replace your bar and chain periodically. The lifespan of a bar and chain depends on several factors, including the type of wood you’re cutting, the frequency of use, and the quality of maintenance.
• Sharpening Costs: Factor in the cost of sharpening your chain. You can either purchase a chainsaw sharpener or pay a professional to sharpen your chain. A chainsaw sharpener typically costs around $50-$100, while professional sharpening services can cost $10-$20 per chain.
• Oil Costs: Don’t forget to factor in the cost of bar and chain oil. A gallon of high-quality bar and chain oil typically costs around $20-$30.
• My Budgeting Strategy: I allocate a specific amount of money each year for chainsaw maintenance and replacement parts. This helps me avoid unexpected expenses and ensures that I always have the tools I need to get the job done.
• Data-Driven Budgeting:
  • Bar Replacement: Budget $60-$85 every 2-5 years, depending on usage and maintenance.
  • Chain Replacement: Budget $25-$40 per chain, and expect to replace chains 1-3 times per year, depending on usage.
  • Sharpening: Budget $50-$100 for a chainsaw sharpener, or $10-$20 per chain for professional sharpening.
  • Oil: Budget $20-$30 per gallon of bar and chain oil, and expect to use several gallons per year.
• Cost-Saving Tips:
  • Buy in bulk: Purchase bar and chain oil in bulk to save money.
  • Sharpen your own chains: Invest in a chainsaw sharpener and learn how to sharpen your own chains.
  • Maintain your equipment: Proper maintenance can significantly extend the life of your bar and chain, saving you money in the long run.
  • Choose the right bar and chain for the job: Using the correct bar and chain for the task at hand can improve efficiency and reduce wear and tear.
  • Consider aftermarket options: While Stihl bars and chains are high-quality, there are also aftermarket options available that may be more affordable. However, be sure to research the quality and reliability of any aftermarket products before purchasing them.

Beyond the Numbers: The Intangible Costs and Benefits

While the above sections focus on quantifiable costs, it’s important to acknowledge the intangible factors that impact your overall woodcutting experience.

• Safety: A well-maintained and properly sized bar and chain are essential for safe woodcutting. A dull chain or a bar that is too long can increase the risk of kickback and other accidents.
• Efficiency: A sharp chain and a properly sized bar can significantly improve your cutting speed and efficiency. This can save you time and energy, especially when cutting large amounts of wood.
• Enjoyment: Woodcutting can be a rewarding and enjoyable activity, but it can also be frustrating and tiring if you’re using the wrong tools or if your equipment is not properly maintained. Investing in the right bar and chain and taking the time to maintain your equipment can make the entire process more enjoyable.
• Environmental Impact: Efficient woodcutting practices can reduce your environmental impact. Using a sharp chain and a properly sized bar can minimize waste and reduce the amount of fuel you consume.
• The Value of Time: My grandfather, a seasoned logger, always said, “Time is money, son.” This adage holds true in woodcutting. The more efficiently you can cut wood, the more time you have for other tasks. Investing in the right tools and maintaining them properly can save you valuable time.

Case Study: Comparing Bar and Chain Performance on Different Wood Types

To illustrate the impact of bar and chain selection on performance, I conducted a small case study comparing cutting speeds on three different types of wood:

• Softwood (Pine): Known for its easy cutting characteristics.
• Hardwood (Oak): Denser and more challenging to cut.
• Resinous Wood (Cedar): Tends to gum up the chain and bar.

I used a Stihl MS 251 with both a 16-inch Rollomatic E bar and a 16-inch Ematic bar, paired with a Rapid Micro (RM) chain. I measured the time it took to cut through a 10-inch diameter log of each wood type.

Key Takeaways from the Case Study:

• The Rollomatic E bar consistently outperformed the Ematic bar, especially on harder and more resinous woods.
• The Ematic bar was more prone to clogging with sap, which reduced its efficiency and required more frequent cleaning.
• The choice of wood type significantly impacted cutting speed. Hardwoods required more power and time to cut than softwoods.

This case study reinforces my personal experience: the Rollomatic E bar is a more versatile and reliable choice for general woodcutting, especially if you frequently encounter a variety of wood types.

The Future of Woodcutting: Innovations and Trends

The world of woodcutting is constantly evolving, with new technologies and trends emerging all the time. Here are a few things to keep an eye on:

• Battery-Powered Chainsaws: Battery-powered chainsaws are becoming increasingly popular, offering a quieter and more environmentally friendly alternative to gasoline-powered saws. While they may not be as powerful as their gasoline counterparts, they are ideal for smaller jobs and homeowners.
• Smart Chainsaws: Some manufacturers are developing “smart” chainsaws that can monitor performance, provide maintenance alerts, and even detect potential safety hazards.
• Sustainable Forestry Practices: There is a growing emphasis on sustainable forestry practices, which aim to ensure that forests are managed responsibly and that wood is harvested in a way that minimizes environmental impact.
• Increased Automation: In the logging industry, there is a trend towards increased automation, with machines being used to fell trees, process logs, and transport wood.

Actionable Takeaways and Next Steps

By now, you should have a solid understanding of the key considerations when choosing and maintaining bars and chains for your Stihl MS 251 Wood Boss. Here are some actionable takeaways and next steps:

1. Assess Your Needs: Determine the types of wood you’ll be cutting and the size of the logs you’ll be handling. This will help you choose the appropriate bar length and chain type.
2. Choose the Right Bar: Based on my experience and the data I’ve presented, I recommend the Stihl Rollomatic E bar for its durability and versatility.
3. Select the Appropriate Chain: For general woodcutting, the Stihl Rapid Micro (RM) chain is a good all-around choice.
4. Invest in Maintenance: Purchase the necessary tools and supplies for cleaning, lubricating, and sharpening your bar and chain.
5. Develop a Budget: Allocate a specific amount of money each year for chainsaw maintenance and replacement parts.
6. Stay Informed: Keep up-to-date on the latest woodcutting technologies and trends.
7. Prioritize Safety: Always wear appropriate safety gear and follow safe woodcutting practices.

My Final Thoughts:

Woodcutting is more than just a task; it’s a craft, a connection to nature, and a source of immense satisfaction. By understanding the nuances of your tools and equipment, you can not only improve your efficiency and reduce your costs, but also enhance your overall experience. The Stihl MS 251 Wood Boss is a capable and reliable saw, and with the right bar and chain, it can be a valuable asset for years to come. So, get out there, cut some wood, and enjoy the fruits (or firewood!) of your labor. Just remember to keep that chain sharp and that bar well-oiled!

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