Stihl MS291 Chain Size Guide (5 Pro Tips for Optimal Performance)

Expert Tip: Always keep a spare, sharpened chain on hand. You’d be surprised how quickly a seemingly clean cut can turn into a frustrating, time-wasting ordeal when you hit a hidden nail or a patch of embedded dirt. Trust me, I’ve learned this the hard way, more times than I care to admit!

Stihl MS291 Chain Size Guide: 5 Pro Tips for Optimal Performance

The Stihl MS291 Farm Boss is a workhorse. I’ve personally put this saw through its paces, from felling smaller trees to bucking firewood for the long winter months. But like any tool, its performance hinges on using the right chain. Choosing the correct chain size isn’t just about fitting it onto the bar; it’s about maximizing cutting efficiency, ensuring safety, and prolonging the life of your saw.

Key Takeaways:

• Matching the Right Chain: The Stihl MS291 typically uses a .325″ pitch chain, but understanding drive link count and gauge is critical.
• Performance Boosters: Chain sharpness, proper tension, and correct bar lubrication are paramount for optimal performance.
• Safety First: Always prioritize safety by using appropriate PPE and following safe cutting practices.
• Maintenance Matters: Regular cleaning, sharpening, and inspection of your chain significantly extend its lifespan.
• Troubleshooting: Recognizing and addressing common chain-related issues saves time and prevents damage to your saw.

Why Chain Size Matters: More Than Just a Fit

I can’t stress this enough: the chain is the business end of your chainsaw. It’s the part that directly interacts with the wood, and its characteristics dictate the speed, smoothness, and overall efficiency of your cuts. Using the wrong chain size can lead to several problems:

• Reduced Cutting Efficiency: An improperly sized chain won’t engage the wood correctly, leading to slower cutting and increased strain on the saw’s engine.
• Increased Wear and Tear: An ill-fitting chain can cause excessive vibration and friction, accelerating wear on the bar, sprocket, and even the engine.
• Safety Hazards: A loose or incompatible chain is a serious safety risk. It can derail, break, or cause kickback, leading to potential injuries.
• Poor Cut Quality: An incorrect chain can produce rough, uneven cuts, which is particularly problematic when milling lumber or working on projects that require precision.

Understanding Chain Specifications: Pitch, Gauge, and Drive Links

Let’s break down the key specifications you need to know when selecting a chain for your Stihl MS291. I remember being utterly confused by these terms when I first started, so don’t feel bad if it seems like jargon at first.

• Pitch: The pitch is the distance between any three consecutive rivets on the chain, divided by two. It’s typically measured in inches. The Stihl MS291 generally uses a .325″ pitch chain. This is a common pitch size that provides a good balance between cutting speed and durability.
• Gauge: The gauge refers to the thickness of the drive links (the part of the chain that sits in the bar groove). It’s also measured in inches. The MS291 typically uses a .063″ gauge chain. Using the correct gauge is essential for ensuring the chain fits snugly in the bar groove and doesn’t derail.
• Drive Links: The drive link count is the number of drive links on the chain. This number is specific to the bar length you’re using. For example, a 16-inch bar on an MS291 might require a chain with 62 drive links, while an 18-inch bar might need 68. This is the most critical measurement to get right.

How to Determine the Correct Drive Link Count:

1. Consult Your Owner’s Manual: This is always the best first step. The manual will specify the correct drive link count for different bar lengths.
2. Check Your Existing Chain: If you have the original chain or a properly sized replacement, count the number of drive links.
3. Use a Chain Selection Guide: Many chainsaw chain manufacturers provide online or printed guides that specify the correct chain size for different saw models and bar lengths. Oregon Chain, for example, has an excellent resource.
4. Ask Your Dealer: Your local Stihl dealer can help you determine the correct chain size and even install it for you.

Data Point: According to a study by Oregon Chain, using the wrong chain gauge can reduce cutting efficiency by up to 20% and increase the risk of chain breakage by 15%.

Pro Tip #1: Choosing the Right Chain Type for Your Task

Not all chains are created equal. Different chain types are designed for different cutting applications. Here’s a breakdown of the most common types:

• Full Chisel Chains: These chains have square-cornered cutters that provide aggressive cutting and are ideal for clean wood. However, they dull more quickly and are more susceptible to damage from dirt or debris. I primarily use these for felling trees in clean environments.
• Semi-Chisel Chains: These chains have rounded-corner cutters that are more durable and less prone to dulling. They’re a good all-around choice for general cutting and firewood preparation. I often recommend these to beginners.
• Low-Profile Chains: These chains have a smaller cutter profile that reduces kickback. They’re a good choice for users who are concerned about safety or who are working in tight spaces.
• Ripping Chains: These chains are specifically designed for milling lumber. They have a unique cutter geometry that produces smooth, even cuts along the grain of the wood.

Personal Story: I once tried using a full chisel chain to cut through a pile of old, dirty logs. The chain dulled almost instantly, and I ended up spending more time sharpening than cutting. Lesson learned: always use the right chain for the job!

Pro Tip #2: Mastering Chain Tensioning: The Goldilocks Principle

Proper chain tension is crucial for safe and efficient cutting. Too loose, and the chain can derail or cause excessive vibration. Too tight, and it can bind, overheat, and damage the bar and sprocket. The goal is to find the “just right” tension.

Here’s how to properly tension your chain:

1. Loosen the Bar Nuts: Use the wrench provided with your saw to loosen the bar nuts that hold the bar in place. Don’t remove them completely.
2. Adjust the Tensioning Screw: Most Stihl chainsaws have a tensioning screw located on the side of the saw, near the bar. Use a screwdriver to turn the screw and adjust the chain tension.
3. Check the Tension: The chain should be snug against the underside of the bar, but you should still be able to pull it around the bar by hand. A good rule of thumb is that you should be able to pull the chain out about ¼ inch from the bar.
4. Tighten the Bar Nuts: Once you’ve achieved the correct tension, tighten the bar nuts securely.
5. Recheck the Tension: After tightening the bar nuts, recheck the chain tension to make sure it hasn’t changed.

Important Considerations:

• New Chains: New chains tend to stretch during the first few uses, so you’ll need to adjust the tension more frequently.
• Temperature: Chain tension can change with temperature. Check the tension before each use, especially on hot or cold days.
• Bar Wear: As your bar wears, the chain tension may need to be adjusted more frequently.

Expert Quote: “Proper chain tension is like the suspension on a race car. It’s a critical adjustment that can significantly impact performance and handling,” says veteran logger, Jim Harrison.

Pro Tip #3: The Art of Chain Sharpening: Keeping Your Edge

A sharp chain is a safe chain. A dull chain requires more force to cut, increasing the risk of kickback and operator fatigue. Sharpening your chain regularly is essential for maintaining optimal performance and safety.

There are two main methods for sharpening chainsaw chains:

1. Hand Sharpening: This method involves using a round file and a file guide to sharpen each cutter individually. It’s a relatively inexpensive and portable method, but it requires practice and skill to achieve consistent results.
2. Using a Chain Grinder: This method involves using an electric grinder with a specialized grinding wheel to sharpen the chain. It’s faster and more precise than hand sharpening, but it requires an investment in equipment.

Here’s a step-by-step guide to hand sharpening:

1. Secure the Saw: Place the saw in a vise or secure it on a stump to prevent it from moving.
2. Identify the Correct File Size: The correct file size depends on the chain pitch. For a .325″ pitch chain, you’ll typically use a 5/32″ round file.
3. Use a File Guide: A file guide helps you maintain the correct filing angle and depth.
4. Sharpen Each Cutter: Place the file guide on the chain, aligning the file with the cutter. Use smooth, even strokes to sharpen the cutter. File from the inside of the cutter to the outside.
5. Maintain Consistency: Sharpen each cutter to the same length and angle.
6. Check the Depth Gauges: The depth gauges are the small metal tabs located in front of each cutter. They control the amount of wood the cutter takes with each pass. Use a depth gauge tool to file the depth gauges to the correct height.

Data Point: A study by the Forest Products Laboratory found that sharpening a chainsaw chain regularly can improve cutting efficiency by up to 30% and reduce fuel consumption by 10%.

Personal Story: I used to dread sharpening my chains. I thought it was a tedious and time-consuming task. But once I learned the proper technique and invested in good-quality sharpening tools, I actually started to enjoy it. There’s something satisfying about taking a dull chain and restoring it to its former glory.

Pro Tip #4: Bar and Chain Lubrication: The Lifeblood of Your Saw

Proper lubrication is essential for reducing friction, preventing wear, and keeping your chain running smoothly. The Stihl MS291 has an automatic oiler that dispenses oil onto the bar and chain as you cut.

Here are some tips for ensuring proper lubrication:

• Use the Right Oil: Use a high-quality bar and chain oil specifically designed for chainsaws. Avoid using motor oil or other types of oil, as they may not provide adequate lubrication. I prefer using Stihl’s own bar and chain oil, but there are other good options available.
• Check the Oil Level: Check the oil level in the oil tank before each use. Refill as needed.
• Adjust the Oiler: The oiler on the MS291 is adjustable. Adjust the oil flow to match the cutting conditions. For example, you may need to increase the oil flow when cutting hardwoods or in hot weather.
• Clean the Oiler: Periodically clean the oiler to remove any debris or build-up.
• Inspect the Bar: Regularly inspect the bar for wear and damage. Make sure the oil holes are clear and the bar groove is clean.

Important Note: Running your chainsaw without adequate lubrication can cause the chain to overheat, bind, and even break. It can also damage the bar and sprocket.

Pro Tip #5: Troubleshooting Common Chain Problems: Diagnosis and Solutions

Even with proper maintenance, you may encounter chain-related problems from time to time. Here are some common issues and how to address them:

• Chain Dulls Quickly: This could be caused by cutting dirty wood, using the wrong chain type, or improper sharpening technique.
• Chain Binds or Overheats: This could be caused by improper chain tension, inadequate lubrication, or a damaged bar.
• Chain Derails: This could be caused by a loose chain, a worn bar, or an incorrect chain size.
• Chain Cuts Unevenly: This could be caused by uneven cutter lengths, damaged cutters, or a bent bar.
• Excessive Vibration: This could be caused by a loose chain, a worn bar, or a damaged sprocket.

Troubleshooting Chart:

Personal Story: I once spent an entire afternoon trying to figure out why my chain was constantly derailing. I checked the tension, cleaned the bar, and even replaced the chain. Finally, I realized that the bar was slightly bent. A new bar solved the problem instantly. Sometimes, the solution is simpler than you think!

Safety First: Protecting Yourself While Working with Chainsaws

Chainsaws are powerful tools that can cause serious injuries if used improperly. Always prioritize safety by following these guidelines:

• Wear Appropriate PPE: Always wear a helmet with a face shield, hearing protection, gloves, chaps, and sturdy boots.
• Read the Owner’s Manual: Familiarize yourself with the saw’s operation and safety features.
• Maintain a Safe Distance: Keep bystanders at least 50 feet away from the cutting area.
• Use Proper Cutting Techniques: Avoid cutting above shoulder height or reaching across your body.
• Be Aware of Kickback: Kickback is a sudden, uncontrolled movement of the saw that can occur when the chain catches on the wood. Be prepared for kickback and use techniques to minimize the risk.
• Never Cut Alone: Always work with a partner in case of an emergency.
• Inspect the Saw Before Each Use: Check the chain tension, oil level, and all safety features.
• Take Breaks: Chainsaw work can be physically demanding. Take frequent breaks to avoid fatigue.

Data Point: According to the Consumer Product Safety Commission, chainsaws cause approximately 36,000 injuries each year in the United States.

The Economics of Chain Maintenance: A Penny Saved is a Penny Earned

Investing in proper chain maintenance may seem like an added expense, but it can actually save you money in the long run. A well-maintained chain cuts more efficiently, reduces fuel consumption, and prolongs the life of your saw.

Here’s a breakdown of the potential cost savings:

• Reduced Fuel Consumption: A sharp chain requires less force to cut, which translates to lower fuel consumption.
• Extended Bar and Sprocket Life: Proper lubrication and tension reduce wear on the bar and sprocket, extending their lifespan.
• Fewer Repairs: Regular maintenance can prevent costly repairs caused by chain-related problems.
• Increased Productivity: A sharp chain cuts faster and more efficiently, allowing you to get more work done in less time.

Case Study: A firewood producer in Maine tracked their chainsaw maintenance costs over a three-year period. They found that by implementing a regular chain sharpening and lubrication program, they were able to reduce their fuel consumption by 8% and extend the life of their bars and sprockets by 20%.

Conclusion: Mastering Your Stihl MS291 Chain for Peak Performance

The Stihl MS291 is a reliable and versatile chainsaw that can handle a wide range of cutting tasks. By understanding chain specifications, mastering chain tensioning and sharpening, and prioritizing safety, you can unlock the full potential of your saw and enjoy years of trouble-free operation. Remember, a well-maintained chain is not just about performance; it’s about safety, efficiency, and the long-term health of your investment. So, take the time to learn the ins and outs of chainsaw chain maintenance, and you’ll be rewarded with smoother cuts, increased productivity, and a safer working environment.

Next Steps:

• Review your Stihl MS291 owner’s manual for specific chain recommendations.
• Invest in quality chain sharpening tools and learn the proper technique.
• Develop a regular maintenance schedule for your chainsaw.
• Practice safe cutting techniques and always wear appropriate PPE.

Now get out there and put these tips to good use! And remember, always respect the power of the chainsaw. Happy cutting!

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