Stihl MS171 Bar And Chain Maintenance Tips (5 Pro Hacks)

I remember the first time I picked up a chainsaw. It was an old, beat-up thing my grandfather used for clearing fallen trees on his property. The roar of the engine, the smell of bar oil and sawdust, it was all a bit intimidating. But after a few shaky cuts, I was hooked. Over the years, I’ve worked with countless chainsaws, from vintage models to the latest high-tech machines. And through it all, I’ve learned that proper maintenance is key to keeping your chainsaw running smoothly and safely. Today, I want to share my knowledge specifically about maintaining the Stihl MS171, a popular and reliable chainsaw, focusing on the bar and chain. These “5 Pro Hacks” will keep your MS171 cutting like new for years to come.

Stihl MS171 Bar and Chain Maintenance Tips (5 Pro Hacks)

1. Sharpening Your Chain Like a Pro: Beyond the Basics

A dull chain is a dangerous chain. It not only makes cutting harder and slower, but it also increases the risk of kickback. I’ve seen firsthand how a dull chain can lead to accidents, so this is where I always tell people to start when discussing chainsaw maintenance.

Why Sharpening Matters:

Efficiency: A sharp chain cuts faster and requires less effort, saving you time and energy.
Safety: A sharp chain is less likely to kick back, reducing the risk of injury.
Chain Life: Regular sharpening extends the life of your chain.
Fuel Efficiency: A sharper chain requires less power to cut, thus saving fuel.

The Tools You’ll Need:

Chainsaw File: A round file specifically sized for your chain’s pitch. For the MS171, you’ll typically need a 5/32″ (4.0 mm) file.
File Holder: A file holder helps maintain the correct filing angle and depth. Stihl offers specific file holders for their chains.
Depth Gauge Tool: Used to check and adjust the depth gauges (rakers) on your chain.
Vise: To secure the chainsaw bar while sharpening. A small, portable vise is ideal for field sharpening.
Gloves: To protect your hands.
Safety Glasses: To protect your eyes from metal filings.

The Sharpening Process (Step-by-Step):

Secure the Bar: Place the chainsaw bar in a vise, ensuring the chain is easily accessible.
Identify the Correct Filing Angle: The correct filing angle is usually marked on the chain or in the chainsaw’s manual. For most Stihl chains, it’s around 30 degrees.
File Each Cutter: Using the file holder, file each cutter consistently. Maintain the correct angle and depth. File from the inside of the cutter outwards.
Count Your Strokes: Make the same number of strokes on each cutter to ensure they are all sharpened evenly. I usually recommend between 3-5 strokes per cutter.
Check the Depth Gauges (Rakers): Use the depth gauge tool to check the height of the depth gauges (rakers). If they are too high, the chain will cut aggressively and be more prone to kickback. If they are too low, the chain won’t cut effectively.
File the Depth Gauges: If necessary, file the depth gauges using a flat file. Lower them slightly, following the manufacturer’s recommendations.
Rotate the Chain: Rotate the chain and repeat the process for all cutters.
Inspect Your Work: After sharpening, inspect the chain for any damaged or uneven cutters.

Pro Tip: Always file in the same direction. Filing back and forth can dull the file and create an uneven edge on the cutter. I’ve found this is a common mistake among beginners.

Depth Gauge Adjustment:

The depth gauge (raker) controls how much the cutter bites into the wood. If the depth gauge is too high, the cutter won’t be able to cut effectively. If it’s too low, the cutter will take too big of a bite, leading to increased kickback and a rough cut.

Checking the Depth Gauges: Place the depth gauge tool on the chain. If the depth gauge protrudes above the tool, it needs to be filed down.
Filing the Depth Gauges: Use a flat file to file down the depth gauges until they are flush with the depth gauge tool. Round off the front of the depth gauge slightly to prevent it from catching on the wood.

When to Sharpen:

Before Each Use: Ideally, sharpen your chain before each use.
When Cutting Performance Decreases: If you notice the chain is cutting slower or requires more effort, it’s time to sharpen.
After Hitting Dirt or Rocks: Contact with dirt or rocks can quickly dull a chain.
Visually Inspect: Inspect the chain regularly for dull or damaged cutters.

Real-World Example: I was once working on a logging project where we were cutting hardwood trees. The chains were getting dull quickly due to the density of the wood. By sharpening the chains multiple times a day, we were able to maintain optimal cutting performance and avoid unnecessary downtime.

Takeaway: Regular and proper chain sharpening is essential for safety, efficiency, and extending the life of your Stihl MS171. Invest in quality sharpening tools and learn the correct techniques.

2. Bar Maintenance: Keeping It Straight and True

The chainsaw bar is the foundation of your cutting system. A bent or damaged bar can lead to uneven cuts, increased chain wear, and even dangerous situations. I’ve seen bars get damaged from pinching, improper chain tension, and even just plain old wear and tear.

Why Bar Maintenance Matters:

Chain Alignment: A straight bar ensures proper chain alignment, resulting in smoother cuts and reduced chain wear.
Reduced Friction: A clean and properly lubricated bar reduces friction, minimizing heat buildup and extending the life of the bar and chain.
Safety: A damaged bar can be a safety hazard. Cracks or bends can cause the chain to derail or break.

The Tools You’ll Need:

Flat File: For removing burrs and smoothing the bar rails.
Bar Rail Dresser: A specialized tool for squaring and truing the bar rails.
Rags: For cleaning the bar.
Wire Brush: For cleaning the oil holes and groove.
Straight Edge: For checking the bar for straightness.

The Bar Maintenance Process (Step-by-Step):

Inspect the Bar: Before each use, inspect the bar for any signs of damage, such as cracks, bends, or burrs.
Clean the Bar: Use a rag to wipe down the bar and remove any sawdust or debris.
Clean the Oil Holes: Use a wire brush to clean the oil holes on the bar. These holes are essential for lubricating the chain. Clogged oil holes can lead to premature chain wear and bar damage.
Clean the Bar Groove: Use a small screwdriver or a specialized bar groove cleaner to remove any debris from the bar groove. This groove is where the chain rides, and a clean groove is essential for smooth operation.
Dress the Bar Rails: Use a flat file or a bar rail dresser to remove any burrs or unevenness from the bar rails. This will ensure that the chain runs smoothly and evenly.
Check for Straightness: Use a straight edge to check the bar for straightness. If the bar is bent, it may be possible to straighten it using a vise and a hammer. However, if the bend is severe, it’s best to replace the bar.
Flip the Bar: Regularly flip the bar to ensure even wear on both sides.

Pro Tip: Always use the correct bar oil. Using the wrong type of oil can lead to premature bar and chain wear. I recommend using a high-quality bar oil specifically designed for chainsaws.

Bar Rail Dressing:

The bar rails are the edges of the bar that the chain rides on. Over time, these rails can become worn or uneven, leading to poor chain alignment and increased friction. Dressing the bar rails involves using a flat file or a bar rail dresser to restore them to their original shape.

Using a Flat File: Hold the flat file at a slight angle to the bar rail and file in a smooth, even motion. Be careful not to remove too much material.
Using a Bar Rail Dresser: A bar rail dresser is a specialized tool that makes it easier to dress the bar rails accurately. Follow the manufacturer’s instructions for using the bar rail dresser.

When to Maintain the Bar:

Before Each Use: Inspect and clean the bar before each use.
After Each Use: Clean the bar after each use to remove sawdust and debris.
When Cutting Performance Decreases: If you notice the chain is cutting unevenly or the bar is getting hot, it’s time to inspect and maintain the bar.
Every 25 Hours of Use: Perform a more thorough bar maintenance, including dressing the bar rails and checking for straightness.

Real-World Example: I once neglected to clean the oil holes on my chainsaw bar. As a result, the chain wasn’t getting enough lubrication, and it quickly overheated and became damaged. I learned my lesson the hard way and now make sure to clean the oil holes regularly.

Takeaway: Proper bar maintenance is crucial for ensuring the longevity and performance of your Stihl MS171. Regularly inspect, clean, and dress the bar to keep it in top condition.

3. Chain Tension: Finding the Sweet Spot

Proper chain tension is critical for safe and efficient chainsaw operation. Too loose, and the chain can derail, causing damage to the bar and potentially injuring the operator. Too tight, and the chain can overheat and break. I’ve seen both happen, and neither is a pretty sight.

Why Chain Tension Matters:

Safety: Proper chain tension prevents the chain from derailing, reducing the risk of injury.
Chain Life: Correct tension minimizes chain wear and extends its life.
Bar Life: Prevents undue wear on the bar rails.
Cutting Performance: Optimal tension allows the chain to cut efficiently.

Checking Chain Tension:

Cool Down: Ensure the chain is cool before checking the tension. A hot chain will expand and give a false reading.
Lift the Chain: Using a gloved hand, lift the chain in the middle of the bar.
Measure the Gap: The gap between the chain and the bar should be approximately 1/8 inch (3 mm).
Rotate the Chain: Rotate the chain around the bar to check for any tight spots.

Adjusting Chain Tension:

Loosen the Bar Nuts: Use the wrench that came with your chainsaw to loosen the bar nuts slightly.
Adjust the Tensioning Screw: Locate the chain tensioning screw on the side of the chainsaw. Turn the screw clockwise to tighten the chain and counterclockwise to loosen it.
Check the Tension: After adjusting the tension, check it again as described above.
Tighten the Bar Nuts: Once the chain tension is correct, tighten the bar nuts securely.

Pro Tip: Adjust the chain tension frequently, especially when the chain is new. A new chain will stretch quickly and require frequent adjustments. Also, temperature affects tension. A chain tightened in the cold may be too tight when warm.

Common Mistakes:

Over-Tightening: Over-tightening the chain can lead to premature wear and damage to the bar and chain.
Under-Tightening: Under-tightening the chain can cause it to derail, posing a safety hazard.
Adjusting a Hot Chain: Adjusting the chain tension when it’s hot can lead to inaccurate adjustments.

Real-World Example: I was once cutting firewood with a friend who had never used a chainsaw before. I showed him how to adjust the chain tension, but he didn’t tighten it enough. As a result, the chain derailed while he was cutting, and he nearly lost control of the chainsaw. Fortunately, he wasn’t injured, but it was a close call.

Takeaway: Maintaining proper chain tension is crucial for safety and performance. Check and adjust the chain tension regularly, and avoid over-tightening or under-tightening.

4. Lubrication: The Lifeblood of Your Chain

Proper lubrication is essential for keeping your chain and bar running smoothly and preventing premature wear. Without adequate lubrication, the chain will overheat, causing it to stretch and break. The bar will also suffer from increased friction, leading to damage and reduced performance. I can’t stress enough how important this is for chainsaw maintenance.

Why Lubrication Matters:

Reduced Friction: Lubrication reduces friction between the chain and the bar, minimizing heat buildup.
Extended Chain Life: Proper lubrication prevents the chain from stretching and breaking, extending its life.
Extended Bar Life: Lubrication reduces wear on the bar rails, extending its life.
Improved Cutting Performance: A well-lubricated chain cuts more efficiently.

Choosing the Right Bar Oil:

Viscosity: Choose a bar oil with the appropriate viscosity for your climate and the type of wood you’re cutting. In colder climates, you’ll need a thinner oil. For cutting hardwoods, you’ll need a thicker oil.
Tackiness: Choose a bar oil that is tacky enough to cling to the chain and bar, even at high speeds.
Biodegradability: Consider using a biodegradable bar oil to reduce your environmental impact.

Checking the Oil Level:

Regularly Check: Check the oil level in the oil reservoir before each use.
Refill as Needed: Refill the oil reservoir whenever it’s low.
Monitor Consumption: Monitor your oil consumption to ensure that the chain is getting enough lubrication.

Adjusting the Oil Flow:

Oil Flow Adjustment Screw: Most chainsaws have an oil flow adjustment screw that allows you to adjust the amount of oil that is delivered to the chain.
Adjust Based on Conditions: Adjust the oil flow based on the type of wood you’re cutting and the ambient temperature. In hot weather or when cutting hardwoods, you’ll need to increase the oil flow.

Pro Tip: Use a high-quality bar oil specifically designed for chainsaws. Avoid using motor oil or other types of oil, as they may not provide adequate lubrication and can damage your chainsaw.

Common Mistakes:

Using the Wrong Type of Oil: Using the wrong type of oil can lead to premature wear and damage to the bar and chain.
Not Checking the Oil Level: Neglecting to check the oil level can lead to inadequate lubrication and damage to the bar and chain.
Not Adjusting the Oil Flow: Failing to adjust the oil flow based on the cutting conditions can lead to either over-lubrication or under-lubrication.

Real-World Example: I once ran out of bar oil while cutting firewood. I didn’t realize it until the chain started smoking and the bar got extremely hot. The chain was damaged beyond repair, and the bar was also slightly warped. I learned my lesson and now always carry extra bar oil with me.

Takeaway: Proper lubrication is essential for the longevity and performance of your Stihl MS171. Use a high-quality bar oil, check the oil level regularly, and adjust the oil flow based on the cutting conditions.

5. Storage: Protecting Your Investment

Proper storage is often overlooked, but it’s crucial for protecting your chainsaw and ensuring that it’s ready to use when you need it. I’ve seen chainsaws left sitting in garages for years, only to find them rusted and unusable.

Why Proper Storage Matters:

Prevents Rust and Corrosion: Proper storage protects your chainsaw from rust and corrosion, extending its life.
Protects Against Damage: Storage protects the chainsaw from physical damage, such as impacts and scratches.
Maintains Fuel Stability: Storage helps maintain the stability of the fuel, preventing it from going stale and causing engine problems.

Preparing Your Chainsaw for Storage:

Clean the Chainsaw: Thoroughly clean the chainsaw to remove any sawdust, debris, or oil.
Drain the Fuel: Drain the fuel tank to prevent the fuel from going stale and causing engine problems.
Empty the Oil Reservoir: Empty the oil reservoir to prevent the oil from gumming up.
Remove the Bar and Chain: Remove the bar and chain and clean them thoroughly.
Sharpen the Chain: Sharpen the chain before storing it so it’s ready to use when you need it.
Lubricate the Bar and Chain: Lubricate the bar and chain with bar oil to prevent rust and corrosion.
Store the Chainsaw in a Safe Place: Store the chainsaw in a dry, safe place where it won’t be exposed to extreme temperatures or humidity.

Long-Term Storage:

Fuel Stabilizer: If you’re storing the chainsaw for an extended period, add a fuel stabilizer to the fuel tank before draining it. This will help prevent the fuel from going stale.
Fogging Oil: Spray fogging oil into the engine cylinder to protect it from rust and corrosion.
Cover the Chainsaw: Cover the chainsaw with a tarp or blanket to protect it from dust and scratches.

Pro Tip: Store the chainsaw with the bar cover on to protect the chain and prevent accidental cuts.

Common Mistakes:

Storing a Dirty Chainsaw: Storing a dirty chainsaw can lead to rust, corrosion, and other problems.
Storing the Chainsaw with Fuel in the Tank: Storing the chainsaw with fuel in the tank can cause the fuel to go stale and damage the engine.
Storing the Chainsaw in a Damp Place: Storing the chainsaw in a damp place can lead to rust and corrosion.

Real-World Example: I once stored my chainsaw in a damp garage for several months without properly preparing it. When I went to use it again, the chain was rusted solid, and the engine wouldn’t start. I had to spend several hours cleaning and repairing the chainsaw before I could use it again.

Takeaway: Proper storage is essential for protecting your Stihl MS171 and ensuring that it’s ready to use when you need it. Clean the chainsaw thoroughly, drain the fuel and oil, remove the bar and chain, and store the chainsaw in a dry, safe place.

By following these 5 pro hacks, you can keep your Stihl MS171 bar and chain in top condition, ensuring safe and efficient cutting for years to come. Remember, a well-maintained chainsaw is a safe and reliable tool. Happy cutting!

Stihl MS171 Bar and Chain Maintenance Tips (5 Pro Hacks)