Stihl MS170 Chain Guide (5 Pro Tips for Optimal Cutting)

Are you struggling to get the most out of your Stihl MS170 chainsaw? Perhaps you’re finding your cuts are uneven, your chain dulls quickly, or the saw just doesn’t seem to have the power you expect. You’re not alone. The Stihl MS170 is a fantastic entry-level chainsaw, perfect for homeowners and light-duty tasks. However, like any tool, mastering its use requires understanding its limitations and employing the right techniques. In this guide, I’ll share five pro tips, honed over years of experience in wood processing and firewood preparation, to help you unlock the full potential of your MS170 and achieve optimal cutting performance.

Mastering the Stihl MS170: 5 Pro Tips for Optimal Cutting

I remember the first time I used a chainsaw. It was a hand-me-down, far from the sleek MS170, but the principle was the same: a spinning chain turning wood into manageable pieces. I made every mistake in the book, from dulling the chain on the ground to pinching the bar in the cut. Through trial and error, and guidance from seasoned loggers, I learned the crucial techniques that I’m about to share with you. These tips aren’t just about using the MS170; they’re about understanding the fundamentals of chainsaw operation, wood properties, and safety.

Tip 1: Chain Selection and Maintenance: The Foundation of Efficient Cutting

The chain is the heart of your chainsaw. A dull or improperly selected chain will drastically reduce cutting performance, increase wear on the saw, and even pose a safety risk.

Understanding Chain Types:

The MS170 typically uses a low-profile chain, often referred to as a Picco Micro 3 (PM3) chain. This chain is designed for smooth cutting and reduced kickback, making it ideal for beginners. However, there are variations within this category. Key considerations include:

• Gauge: The gauge refers to the thickness of the drive links that fit into the guide bar groove. The MS170 typically uses a .050″ (1.3mm) gauge chain. Using the wrong gauge will prevent the chain from fitting properly.
• Pitch: The pitch is the distance between three consecutive rivets divided by two. The MS170 generally uses a 3/8″ Picco (LP) pitch.
• Number of Drive Links: This is specific to your bar length. Count the number of drive links on your old chain before replacing it to ensure you purchase the correct length. A 16-inch bar on the MS170 usually requires around 55 drive links, but always confirm.

My Experience: I once tried to save money by using a generic chain on my MS170. It fit, but the cutting performance was terrible. The chain dulling quickly, the saw vibrated excessively, and the cuts were rough. I quickly realized that investing in a quality Stihl chain was worth the extra cost in terms of performance, longevity, and safety.

Chain Sharpening: A Critical Skill

A sharp chain is essential for efficient and safe cutting. A dull chain requires more force, increases the risk of kickback, and puts unnecessary strain on the saw’s engine. Sharpening your chain regularly is crucial.

• Tools: You’ll need a chainsaw file (typically 4.0mm for the MS170), a file guide, and a depth gauge tool.
• Technique: Secure the chainsaw in a vise or on a stable surface. Use the file guide to maintain the correct angle (typically 30 degrees) and depth. File each cutter evenly, using smooth, consistent strokes. Pay attention to the depth gauges; these should be filed down periodically to ensure they are at the correct height.

Data and Insights: Studies show that a properly sharpened chain can reduce cutting time by up to 50% compared to a dull chain. This translates to less fuel consumption, reduced wear on the saw, and increased productivity.

Chain Tension:

Proper chain tension is vital for safety and performance. A loose chain can derail, causing injury, while an overly tight chain can bind and cause premature wear.

• Checking Tension: Lift the chain away from the bar midway along the top. You should be able to pull the chain out about 1/8 inch (3mm).
• Adjusting Tension: Use the chain tensioning screw, located on the side of the saw, to adjust the tension. Tighten or loosen the screw until the chain has the correct amount of slack. Always check the tension after the first few cuts, as the chain will stretch as it warms up.

Strategic Advantage: Mastering chain sharpening and maintenance not only improves cutting performance but also extends the life of your chain and saw. It’s a skill that every chainsaw user should develop.

Tip 2: Understanding Wood Types and Cutting Techniques

Not all wood is created equal. The type of wood you’re cutting, its moisture content, and its internal stresses will all affect how the chainsaw performs.

Green Wood vs. Seasoned Wood:

• Green Wood: This is freshly cut wood that still contains a high amount of moisture. Green wood is generally easier to cut than seasoned wood, as it’s softer. However, it’s also heavier and more prone to binding the chain. Examples include freshly felled trees.
• Seasoned Wood: This is wood that has been allowed to dry for several months or years. Seasoned wood is harder and more stable than green wood, making it ideal for firewood and construction. However, it can be more challenging to cut, especially if it’s knotty or dense.

Wood Density and Hardness:

Different wood species have different densities and hardness levels. Softwoods like pine and fir are generally easier to cut than hardwoods like oak and maple.

• Softwoods: Pine, fir, spruce, cedar. Easier to cut, less wear on the chain.
• Hardwoods: Oak, maple, beech, ash. More challenging to cut, require a sharper chain.

Cutting Techniques:

• Bore Cutting: This technique involves plunging the tip of the bar into the wood to create a hole. It’s useful for felling trees and removing branches. However, it’s also one of the most dangerous techniques, as it can lead to kickback. I advise against this technique with the MS170 unless you are a very experienced user.
• Conventional Cutting: This is the most common technique, where you use the bottom of the bar to cut through the wood. It’s generally safer and more efficient than bore cutting.
• Undercutting and Overcutting: When felling trees, it’s crucial to use a combination of undercutting and overcutting to control the direction of the fall. The undercut creates a hinge that guides the tree, while the overcut severs the remaining wood.

Case Study: Cutting Knotty Oak:

I once had a project involving cutting a large oak tree into firewood. The oak was seasoned and riddled with knots. I quickly realized that my usual cutting techniques weren’t working. The chain kept binding, and the saw was struggling. I switched to a sharper chain, used a slower cutting speed, and focused on making small, controlled cuts. I also used wedges to prevent the wood from pinching the bar. By adapting my technique to the specific properties of the wood, I was able to complete the project safely and efficiently.

Strategic Advantage: Understanding wood types and adapting your cutting techniques accordingly will significantly improve your cutting efficiency and reduce the risk of accidents.

Tip 3: Mastering Felling Techniques (For Small Trees)

While the MS170 isn’t designed for felling large trees, it can be used to safely fell smaller trees with the right techniques. Always assess the situation carefully and prioritize safety.

Assessing the Tree:

Before felling any tree, it’s crucial to assess the following:

• Lean: Which way is the tree naturally leaning?
• Branches: Are there any dead or hanging branches that could fall unexpectedly?
• Surroundings: Are there any obstacles, such as power lines, buildings, or roads, that could be damaged by the falling tree?
• Escape Route: Plan a clear escape route that is 45 degrees away from the direction of the fall.

Felling Cuts:

• Undercut: Make a notch on the side of the tree facing the direction you want it to fall. The undercut should be about one-third of the tree’s diameter. The angle of the undercut is important. The top cut should be about 60 degrees and the bottom cut should be about 30 degrees, creating a clean “V” shape.
• Back Cut: Make a back cut on the opposite side of the tree, slightly above the bottom of the undercut. Leave a hinge of wood between the back cut and the undercut. This hinge will control the direction of the fall.
• Wedges: If the tree is leaning in the wrong direction or if you’re concerned about it falling prematurely, use wedges to help guide the fall. Drive the wedges into the back cut to push the tree over.

Safety Precautions:

• Wear appropriate safety gear: This includes a helmet, eye protection, hearing protection, gloves, and chainsaw chaps.
• Clear the area of people and obstacles.
• Be aware of your surroundings.
• Never fell a tree alone.
• If you’re unsure about any aspect of the felling process, consult with a professional.

My Experience: I once underestimated the lean of a small tree and almost had it fall in the wrong direction. Fortunately, I was able to react quickly and avoid a dangerous situation. This experience taught me the importance of careful assessment and planning before felling any tree.

Strategic Advantage: Safe felling techniques are essential for protecting yourself and your property. Always prioritize safety and never take unnecessary risks.

Tip 4: Optimizing Bar and Chain Oiling

Proper lubrication is essential for the longevity and performance of your bar and chain. Without adequate oil, the chain will overheat, causing premature wear and potentially damaging the bar and saw.

Oil Types:

• Bar and Chain Oil: Use a high-quality bar and chain oil specifically designed for chainsaws. These oils contain additives that help them adhere to the chain and provide excellent lubrication. I recommend Stihl bar and chain oil.
• Avoid Using Motor Oil: Motor oil is not designed for the high-speed, high-friction environment of a chainsaw bar and chain. It will not provide adequate lubrication and can damage the saw.

Oiling System:

The MS170 has an automatic oiling system that lubricates the bar and chain while the saw is running. Check the oil level regularly and refill as needed.

• Adjusting Oil Flow: Some chainsaws allow you to adjust the oil flow rate. If you’re cutting dense wood or working in hot weather, you may need to increase the oil flow.
• Checking for Proper Oiling: Hold the chainsaw over a piece of cardboard and rev the engine. You should see a spray of oil coming from the bar. If you don’t see oil, check the oil tank, oil filter, and oil pump.

Cleaning the Oiling System:

Over time, the oiling system can become clogged with debris. Clean the oil filter regularly to ensure proper oil flow.

• Oil Filter Location: The oil filter is typically located inside the oil tank.
• Cleaning Procedure: Remove the oil filter and clean it with solvent or compressed air.

My Experience: I once neglected to check the oil level on my chainsaw and ran it dry. The chain overheated and seized, causing significant damage to the bar and chain. This costly mistake taught me the importance of regular maintenance and proper lubrication.

Strategic Advantage: Proper bar and chain oiling is essential for extending the life of your chainsaw and ensuring optimal performance.

Tip 5: Safe Handling and Storage Practices

Chainsaws are powerful tools that can be dangerous if not handled and stored properly.

Safety Gear:

• Helmet: Protects your head from falling branches and debris.
• Eye Protection: Protects your eyes from flying chips and sawdust.
• Hearing Protection: Protects your ears from the loud noise of the chainsaw.
• Gloves: Protect your hands from cuts and abrasions.
• Chainsaw Chaps: Protect your legs from accidental cuts.

Starting and Stopping the Chainsaw:

• Starting: Place the chainsaw on a flat, stable surface. Engage the chain brake. Hold the saw firmly with one hand and pull the starter cord with the other.
• Stopping: Release the throttle and engage the chain brake.

Carrying the Chainsaw:

• Engage the chain brake.
• Carry the chainsaw with the bar pointing backwards.
• Keep the chainsaw away from your body.

Storage:

• Clean the chainsaw thoroughly after each use.
• Empty the fuel tank and run the engine until it stalls to prevent fuel from gumming up the carburetor.
• Store the chainsaw in a dry, secure location, out of reach of children.
• Use a bar cover to protect the chain and prevent accidental cuts.

Fuel Storage:

• Store fuel in an approved container.
• Keep fuel away from sources of heat and ignition.
• Do not store fuel in direct sunlight.

My Experience: I once witnessed a serious accident involving a chainsaw that was not stored properly. A child accidentally started the chainsaw, resulting in severe injuries. This incident reinforced the importance of safe storage practices.

Strategic Advantage: Safe handling and storage practices are essential for preventing accidents and protecting yourself and others.

Conclusion: Mastering the MS170 for Years of Reliable Service

The Stihl MS170 is a capable chainsaw when used correctly. By following these five pro tips – focusing on chain maintenance, understanding wood types, mastering felling techniques (for small trees), optimizing oiling, and practicing safe handling – you can unlock its full potential and enjoy years of reliable service. Remember, safety is paramount. Always wear appropriate safety gear, assess the situation carefully before cutting, and never take unnecessary risks.

Now, take what you’ve learned and put it into practice. Start with something simple, like cutting firewood. Focus on mastering the basics, and gradually work your way up to more challenging tasks. With practice and patience, you’ll become a proficient chainsaw operator, capable of tackling a wide range of wood processing and firewood preparation projects. And always remember, continuous learning and refinement are key to maximizing your skills and ensuring safety. Good luck, and happy cutting!

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