MS 170 Stihl Chain Guide: Choosing The Best 18” Bar (5 Pro Tips)

The integration of technology into the world of wood processing and firewood preparation has been nothing short of revolutionary. From GPS-guided felling operations in large-scale logging to advanced moisture meters that ensure perfectly seasoned firewood, we’ve come a long way from the simple axe and saw. Today, even the humble chainsaw, a mainstay of woodcutting, benefits from innovations like anti-vibration systems, ergonomic designs, and fuel-efficient engines. These advancements not only boost productivity but also enhance safety and reduce physical strain, making wood processing more accessible and enjoyable for both professionals and hobbyists alike.

MS 170 Stihl Chain Guide: Choosing the Best 18” Bar (5 Pro Tips)

Alright, let’s talk chainsaws. More specifically, let’s dive deep into optimizing your MS 170 Stihl chainsaw with the right 18-inch bar. This isn’t just about slapping any old bar on your saw; it’s about understanding the nuances of bar selection to maximize performance, safety, and the lifespan of your trusty Stihl. I’ve spent years felling trees, bucking logs, and prepping firewood, and I’ve learned a thing or two about matching the right bar to the right saw. Trust me, the difference is night and day.

The firewood industry, for example, is a significant market with global implications. According to recent statistics, the global firewood market is projected to reach multi-billion dollar figures in the coming years, driven by the increasing demand for renewable energy sources and the rising cost of fossil fuels. This growth underscores the importance of efficient and sustainable firewood preparation, and the right tools can make all the difference.

Choosing the right bar for your MS 170 is vital, whether you’re a seasoned logger, a homeowner managing your property, or a small-scale firewood producer. This guide gives you five pro tips to help you make the best choice.

Understanding the MS 170 Stihl Chainsaw

Before we jump into bar selection, let’s get grounded with the MS 170 itself. The Stihl MS 170 is a lightweight, entry-level chainsaw, a popular choice for homeowners and occasional users. It’s known for its ease of use, reliability, and affordability. However, it has its limitations. It’s not designed for heavy-duty, commercial logging. Think of it as the perfect tool for limbing small trees, cutting firewood, and general yard maintenance.

Engine Size: Typically around 30.1 cc
Power Output: Roughly 1.7 horsepower
Guide Bar Length: Usually comes with a 14-inch or 16-inch bar
Weight: Around 8.6 pounds (without fuel and bar)

Why Choose an 18-Inch Bar for the MS 170?

The stock bar on the MS 170 is usually shorter. So, why even consider an 18-inch bar? Here’s the deal:

Increased Reach: An 18-inch bar allows you to cut through larger diameter logs without having to reposition the saw constantly. This can save you time and effort.
Versatility: It expands the range of tasks the MS 170 can handle. You can tackle slightly larger trees and logs with greater ease.
Convenience: If you regularly work with logs that are close to the 16-inch limit of the standard bar, the extra length of an 18-inch bar can provide a more comfortable and efficient cutting experience.

However, there are trade-offs. An 18-inch bar will put more strain on the MS 170’s engine, potentially reducing its lifespan if used improperly. It’s crucial to understand the saw’s limitations and use the longer bar judiciously.

Pro Tip #1: Check the Specifications and Compatibility

This might seem obvious, but it’s the most critical step. Before you even think about buying an 18-inch bar, make sure it’s compatible with your MS 170.

Mounting Pattern: Chainsaw bars are attached to the saw via a specific mounting pattern. The bar must have the correct mounting holes to fit the MS 170.
Chain Pitch and Gauge: The bar must be compatible with the chain pitch and gauge that your saw uses. The MS 170 typically uses a 3/8″ low profile (0.375″) pitch chain with a 0.050″ (1.3 mm) gauge.
Oil Hole Alignment: The oil hole on the bar must align with the oil outlet on the saw. Proper lubrication is essential to prevent overheating and premature wear.

How to Verify Compatibility:

Consult the Stihl Manual: Your MS 170 owner’s manual is your best friend. It will list the compatible bar lengths, chain pitch, and gauge.
Use the Stihl Website: Stihl’s website has a parts finder that allows you to input your saw model and find compatible accessories.
Ask a Dealer: Visit your local Stihl dealer. They can verify compatibility and recommend the right bar for your saw.
Cross-Reference Part Numbers: If you’re buying online, look for part numbers that are specifically listed as compatible with the MS 170.

Example:

Let’s say you’re looking at an Oregon bar online. You need to ensure it states something like: “Fits Stihl MS 170, 3/8″ LP, .050″ gauge.” Don’t assume anything; double-check the specs.

Why This Matters:

Using an incompatible bar can lead to several problems:

Damage to the Saw: An improperly mounted bar can damage the saw’s housing, drive sprocket, and oil pump.
Chain Issues: An incorrect chain pitch or gauge can cause the chain to bind, break, or wear out prematurely.
Safety Hazards: An improperly fitted bar can come loose during operation, posing a serious safety risk.

Pro Tip #2: Understand Bar Types and Features

Not all chainsaw bars are created equal. They come in different types, each with its own set of features and benefits. Knowing the differences will help you choose the best bar for your needs.

Bar Types

Laminated Bars: These are the most common type of bar, consisting of multiple layers of steel welded together. They are lightweight, durable, and relatively inexpensive. Laminated bars are a good choice for general-purpose use.
Solid Bars: These bars are made from a single piece of steel. They are more durable and rigid than laminated bars, making them suitable for heavy-duty applications. However, they are also heavier and more expensive. Given the MS 170’s lower power, a solid bar is generally overkill.
Sprocket Nose Bars: These bars have a small sprocket at the tip, which reduces friction and improves cutting speed. They are often used by professional loggers and tree surgeons. Sprocket nose bars can be a good option if you prioritize cutting speed, but they require more maintenance and are more prone to damage.

Key Features to Consider

Bar Material: Look for bars made from high-quality steel, such as chrome-molybdenum alloy. This type of steel is strong, durable, and resistant to wear.
Hardness: The bar should be hardened to resist bending and wear. Look for a bar with a Rockwell hardness rating of at least 50 HRC.
Lubrication: Proper lubrication is essential to prevent overheating and premature wear. Look for a bar with a good oiling system, such as a large oil reservoir and multiple oil holes. Some bars even have laser-cut oil holes for improved oil flow.
Replaceable Sprocket Nose: If you opt for a sprocket nose bar, make sure the sprocket is replaceable. This will save you money in the long run, as you won’t have to replace the entire bar when the sprocket wears out.
Bar Weight: Given the MS 170’s limited power, it’s crucial to choose a lightweight bar. A heavier bar will put more strain on the engine and reduce cutting performance.

My Experience:

I once made the mistake of buying a cheap, no-name bar online. It looked the part, but the steel was soft, and the oiling system was inadequate. The bar wore out quickly, and the chain kept binding. I learned my lesson: it’s worth investing in a quality bar from a reputable brand.

Pro Tip #3: Choose the Right Chain for the Bar

The chainsaw bar and chain work together as a system. Choosing the right chain for your 18-inch bar is just as important as choosing the right bar itself.

Chain Types

Full Chisel: These chains have square-cornered cutters that slice through wood quickly and efficiently. They are best suited for clean, softwood applications. However, they are more prone to damage from dirt and debris.
Semi-Chisel: These chains have rounded-corner cutters that are more durable and resistant to damage than full chisel chains. They are a good choice for general-purpose use, especially in dirty or abrasive conditions.
Low-Profile (Micro-Lite): These chains have a smaller cutter and a narrower kerf (the width of the cut). They require less power to operate, making them a good choice for smaller chainsaws like the MS 170. They also tend to vibrate less, making them easier to control.
Ripping Chain: These chains are designed for cutting wood along the grain, as in milling logs into boards. They have a different cutter geometry than cross-cutting chains, resulting in a smoother, more efficient cut.

Key Chain Features to Consider

Chain Pitch: As mentioned earlier, the chain pitch must match the bar’s pitch. The MS 170 typically uses a 3/8″ low profile (0.375″) pitch chain.
Chain Gauge: The chain gauge must also match the bar’s gauge. The MS 170 typically uses a 0.050″ (1.3 mm) gauge chain.
Number of Drive Links: The number of drive links is the number of links that fit into the bar’s groove. This number will vary depending on the bar length and the chain pitch. An 18-inch bar for the MS 170 will typically require around 62 drive links.
Chain Material: Look for chains made from high-quality steel that is hardened for durability.
Chain Design: Some chains have special features, such as anti-vibration links or low-kickback designs, that can improve safety and comfort.

Matching the Chain to the Bar:

When choosing a chain for your 18-inch bar, consider the following:

For General Use: A semi-chisel or low-profile chain is a good choice for general-purpose cutting. They are durable, versatile, and relatively easy to sharpen.
For Clean Wood: If you’re cutting clean, softwood, a full chisel chain can provide faster cutting speeds. However, be prepared to sharpen it more frequently.
For Dirty Conditions: If you’re cutting in dirty or abrasive conditions, a semi-chisel chain is the best choice. Its rounded cutters are more resistant to damage.

Chain Maintenance:

Proper chain maintenance is essential for optimal performance and safety.

Sharpening: Keep your chain sharp. A dull chain will cut slowly, require more effort, and increase the risk of kickback. Use a chainsaw file or a chain grinder to sharpen the cutters.
Lubrication: Keep your chain well-lubricated. Insufficient lubrication will cause the chain to overheat and wear out prematurely. Use a good quality bar and chain oil.
Tensioning: Keep your chain properly tensioned. A loose chain can come off the bar, while a tight chain can bind and overheat. Adjust the chain tension according to the manufacturer’s instructions.
Cleaning: Clean your chain regularly to remove dirt, debris, and pitch. Use a brush or a solvent to clean the chain.
Inspection: Inspect your chain regularly for damage, such as cracked or broken cutters. Replace the chain if it is damaged.

Pro Tip #4: Adjust Your Cutting Technique

Slapping an 18-inch bar on your MS 170 isn’t a magic bullet. You’ll need to adjust your cutting technique to compensate for the longer bar and the saw’s limited power.

Understanding the Limitations

Remember, the MS 170 is a relatively small and lightweight chainsaw. It’s not designed for heavy-duty cutting. An 18-inch bar will increase the saw’s cutting capacity, but it will also put more strain on the engine.

Avoid Overloading: Don’t try to cut through logs that are too large for the saw. This will bog down the engine and potentially damage it.
Use the Right Technique: Use proper cutting techniques to minimize strain on the saw.
Take Breaks: Give the saw a break every now and then to prevent overheating.

Cutting Techniques for Longer Bars

Patience is Key: Don’t force the saw through the wood. Let the chain do the work. Apply gentle pressure and allow the saw to cut at its own pace.
Use the Bumper Spikes: The bumper spikes (also known as felling dogs) are the metal teeth located near the base of the bar. Use these to lever the saw into the wood. This will help you control the saw and reduce strain on your arms.
Maintain a Straight Line: Keep the bar aligned with the direction of the cut. Twisting or bending the bar can cause it to bind and increase the risk of kickback.
Use the Pulling Chain: The bottom of the chain is called the “pulling chain” because it pulls the saw into the wood. Use this part of the chain to do most of the cutting.
Avoid the Tip: The tip of the bar is the most dangerous part of the saw. Avoid using it whenever possible, as it is more prone to kickback.
Make Multiple Passes: For larger logs, it’s often better to make multiple passes rather than trying to cut through the entire log in one go. This will reduce strain on the saw and make the cutting process easier.
Proper Body Positioning: Ensure you have a stable stance and maintain a safe distance from the cutting area. Keep both hands firmly on the saw and avoid overreaching.

Real-World Scenario:

I was once helping a friend clear some fallen trees after a storm. He had an MS 170 with an 18-inch bar, and he was struggling to cut through a large oak log. He was forcing the saw, and it kept bogging down. I showed him how to use the bumper spikes, make multiple passes, and let the chain do the work. He was amazed at how much easier it became.

Safety First

Wear Proper Safety Gear: Always wear a helmet, eye protection, hearing protection, gloves, and chainsaw chaps when operating a chainsaw.
Be Aware of Your Surroundings: Make sure the area around you is clear of obstacles and bystanders.
Know Your Limits: Don’t try to do more than you are capable of. If you’re feeling tired or fatigued, take a break.
Read the Manual: Familiarize yourself with the chainsaw’s operating instructions and safety precautions.

Pro Tip #5: Maintain Your Equipment

A well-maintained chainsaw is a safe and efficient chainsaw. Regular maintenance will extend the life of your MS 170 and ensure it performs optimally.

Daily Maintenance

Check the Chain Tension: Make sure the chain is properly tensioned.
Check the Chain Sharpness: Sharpen the chain if it is dull.
Clean the Bar and Chain: Remove any dirt, debris, and pitch from the bar and chain.
Check the Oil Level: Make sure the oil reservoir is full.
Check the Fuel Level: Make sure the fuel tank is full.
Inspect the Saw: Look for any signs of damage or wear.

Weekly Maintenance

Clean the Air Filter: A dirty air filter can reduce the saw’s performance. Clean the air filter with compressed air or soap and water.
Clean the Spark Plug: A dirty spark plug can cause the saw to start hard or run poorly. Clean the spark plug with a wire brush.
Inspect the Spark Arrestor: A clogged spark arrestor can reduce the saw’s performance and increase the risk of fire. Clean the spark arrestor with a wire brush.
Grease the Sprocket Nose: If your bar has a sprocket nose, grease it regularly to prevent wear.

Monthly Maintenance

Check the Fuel Filter: A clogged fuel filter can cause the saw to start hard or run poorly. Replace the fuel filter if it is dirty.
Inspect the Fuel Lines: Check the fuel lines for cracks or leaks. Replace the fuel lines if they are damaged.
Check the Anti-Vibration Mounts: Make sure the anti-vibration mounts are in good condition. Replace them if they are worn or damaged.
Sharpen the Chain Professionally: Have your chain professionally sharpened to ensure it is properly sharpened and balanced.

Seasonal Maintenance

Drain the Fuel: If you’re not going to use the saw for an extended period, drain the fuel tank and run the saw until it stalls. This will prevent the fuel from going stale and damaging the carburetor.
Store the Saw Properly: Store the saw in a dry, protected location.

Why Maintenance Matters:

I’ve seen firsthand what happens when people neglect their equipment. I worked with a guy who never cleaned his air filter or sharpened his chain. His saw ran poorly, and he was constantly fighting it. Eventually, the engine seized up, and he had to buy a new saw. A little bit of maintenance can go a long way in preventing costly repairs and extending the life of your equipment.

Cost Considerations:

Bar and Chain Oil: Budget for regular purchases of bar and chain oil. A gallon typically costs between $10 and $20.
Chain Sharpening Equipment: Invest in a chainsaw file and guide or a chain grinder. A good chainsaw file and guide can cost around $20 to $50, while a chain grinder can range from $100 to $300.
Replacement Chains: Factor in the cost of replacing chains as they wear out. A new chain for an 18-inch bar can cost between $20 and $40.
Professional Servicing: Consider having your chainsaw professionally serviced once a year. This can cost between $50 and $100.

Troubleshooting Common Issues

Even with the right bar and proper technique, you might encounter some common issues when using an 18-inch bar on your MS 170. Here’s a quick troubleshooting guide:

Saw Bogs Down:
- Possible Cause: The bar is too long, the chain is dull, the air filter is dirty, or the spark plug is fouled.
- Solution: Use a shorter bar, sharpen the chain, clean the air filter, or replace the spark plug.
Chain Binds:
- Possible Cause: The chain is too tight, the bar is not properly lubricated, or the chain is damaged.
- Solution: Adjust the chain tension, lubricate the bar, or replace the chain.
Saw Starts Hard:
- Possible Cause: The fuel is stale, the spark plug is fouled, or the carburetor is clogged.
- Solution: Use fresh fuel, replace the spark plug, or clean the carburetor.
Saw Overheats:
- Possible Cause: The bar is not properly lubricated, the air filter is dirty, or the saw is being overloaded.
- Solution: Lubricate the bar, clean the air filter, or reduce the load on the saw.
Excessive Vibration:
- Possible Cause: The chain is dull, the bar is damaged, or the anti-vibration mounts are worn.
- Solution: Sharpen the chain, replace the bar, or replace the anti-vibration mounts.

Case Study: Small-Scale Firewood Production

Let’s look at a case study to illustrate the benefits of choosing the right bar for your MS 170.

Scenario:

A small-scale firewood producer in rural Maine relies on an MS 170 for bucking logs into firewood lengths. They primarily process softwood, such as pine and fir, sourced from local landowners.

Challenge:

The producer initially used the stock 16-inch bar on their MS 170. While it was adequate for smaller logs, it struggled with larger diameter pieces, requiring multiple cuts and increasing processing time.

Solution:

After consulting with a Stihl dealer, the producer decided to upgrade to an 18-inch bar with a low-profile chain.

Results:

Increased Efficiency: The longer bar allowed the producer to cut through larger logs in a single pass, significantly reducing processing time.
Reduced Effort: The longer bar reduced the need for awkward repositioning, minimizing physical strain.
Improved Profitability: The increased efficiency translated into higher firewood output, boosting the producer’s profitability.
Enhanced Safety: The reduced strain and improved control contributed to a safer working environment.

Key Takeaway:

This case study demonstrates that choosing the right bar can have a significant impact on efficiency, profitability, and safety, even for small-scale operations.

Next Steps and Additional Resources

So, you’ve got the knowledge, now it’s time to put it into action! Here are some next steps and resources to help you get started:

Visit Your Local Stihl Dealer: Talk to a Stihl dealer about your needs and get their recommendations for the best 18-inch bar and chain for your MS 170.
Shop Online: Compare prices and read reviews on websites like Amazon, eBay, and Forestry Suppliers.
Join Online Forums: Connect with other chainsaw users on online forums like ArboristSite and Chainsaw Repair.
Take a Chainsaw Safety Course: Consider taking a chainsaw safety course to learn proper cutting techniques and safety precautions.
Rent a Chainsaw: If you’re not ready to buy a new chainsaw, consider renting one from a local rental company.
Find a Local Arborist: If you need help with tree removal or other tree care services, find a qualified arborist in your area.

Additional Resources:

Stihl Website: https://www.stihl.com/
Oregon Products Website: https://www.oregonproducts.com/
ArboristSite: https://www.arboristsite.com/
Forestry Suppliers: https://www.forestry-suppliers.com/

Final Thoughts

Choosing the right 18-inch bar for your MS 170 Stihl chainsaw is a crucial step in optimizing its performance and ensuring your safety. By understanding the specifications, bar types, chain options, cutting techniques, and maintenance requirements, you can make an informed decision and get the most out of your saw. Remember, it’s not just about having the right tools; it’s about using them safely and effectively. So, gear up, stay sharp, and get cutting!

MS 170 Stihl Chain Guide: Choosing the Best 18” Bar (5 Pro Tips)