Stihl Chainsaw Bar 18 Inch: Best Upgrades For MS170 (Expert Tips)

Ever felt like your trusty Stihl MS170 chainsaw could use a little extra oomph? You’re not alone. I remember the first time I tackled a serious firewood project. My MS170, a reliable little workhorse, was struggling with some seasoned oak. I knew I needed an upgrade, but where to start? The options seemed endless. That’s when I dove deep into researching the best upgrades for this model, focusing specifically on the 18-inch bar. Let’s explore the world of MS170 upgrades, focusing on the 18-inch bar and how it can transform your cutting experience. I’ll share expert tips, cost considerations, and practical advice based on my own experiences and extensive research.

Stihl Chainsaw Bar 18 Inch: Best Upgrades for MS170 (Expert Tips)

The Stihl MS170 is a fantastic entry-level chainsaw, known for its lightweight design and ease of use. However, like any tool, it has its limitations. One common desire among MS170 users is to increase its cutting capacity, and that’s where an 18-inch bar comes in. But simply slapping on a longer bar isn’t always the best approach. We need to consider the saw’s engine power, chain type, and overall balance. Let’s dive into the upgrades that will make your MS170 with an 18-inch bar a cutting machine.

Why Upgrade to an 18-Inch Bar?

Before we get into the specifics, let’s address the “why.” Why would you even consider putting an 18-inch bar on an MS170? Here are a few reasons:

Increased Cutting Capacity: Obviously, a longer bar allows you to tackle larger diameter logs. This is especially useful for felling small trees or processing larger firewood rounds.
Improved Reach: An 18-inch bar can be helpful when cutting branches that are slightly out of reach, reducing the need to constantly reposition yourself.
Versatility: With a longer bar, your MS170 becomes more versatile, capable of handling a wider range of cutting tasks.

However, it’s crucial to understand that the MS170’s engine is designed for smaller bars (typically 14-16 inches). Overloading it with an inappropriately long bar can lead to reduced performance, increased wear and tear, and even engine damage. That’s why proper upgrades and adjustments are essential.

Selecting the Right 18-Inch Bar for Your MS170

The first step is choosing the right bar. Not all 18-inch bars are created equal. Here are some key factors to consider:

Bar Type: There are several types of chainsaw bars, including:
- Laminated Bars: These are the most common and affordable type, consisting of multiple layers of steel welded together. They are suitable for general-purpose cutting.
- Solid Bars: These are made from a single piece of steel and are more durable and resistant to bending than laminated bars. They are a good choice for heavy-duty use.
- Carving Bars: These are specialized bars designed for intricate carving work. They are not typically used for general cutting.
Bar Mount: Ensure the bar you choose has the correct mount for your MS170. Stihl uses a specific bar mount pattern, so double-check compatibility before purchasing.
Chain Gauge and Pitch: The bar must be compatible with the chain gauge and pitch of your chainsaw. The gauge refers to the thickness of the drive links that fit into the bar groove, while the pitch is the distance between the chain’s rivets. Using the wrong chain can damage the bar and the chainsaw. For the MS170, the common chain pitch is 3/8″ Picco and the gauge is .050″.
Brand: Stihl, Oregon, and Husqvarna are reputable brands that offer high-quality chainsaw bars. While Stihl bars are generally considered the best match for Stihl chainsaws, Oregon bars offer a good balance of performance and affordability.

Cost Considerations:

Laminated Bars: $30 – $50
Solid Bars: $60 – $100
Oregon Bars: $35 – $65

Data Source: Amazon, Home Depot, and specialty chainsaw retailers (as of October 2024).

Personal Story: I initially opted for a cheaper, off-brand bar. It didn’t last long. The bar rails wore out quickly, and the chain kept derailing. I learned my lesson and invested in an Oregon bar, and the difference in performance and durability was night and day.

Essential Upgrades for Optimal Performance with an 18-Inch Bar

Simply slapping an 18-inch bar on your MS170 isn’t enough. To get the most out of this upgrade, you’ll need to consider additional modifications.

1. Chain Selection: Choosing the Right Chain for the Job

The chain is just as important as the bar. Using the wrong chain can lead to poor cutting performance, increased kickback, and accelerated wear and tear.

Chain Type:
- Full Chisel: These chains have aggressive cutting teeth and are ideal for fast, efficient cutting in clean wood. However, they are more prone to kickback and require more sharpening.
- Semi-Chisel: These chains have rounded cutting teeth and are more forgiving than full chisel chains. They are a good choice for general-purpose cutting and are less prone to kickback.
- Low-Kickback: These chains are designed to reduce the risk of kickback, making them a safer option for inexperienced users. However, they typically cut slower than full chisel or semi-chisel chains.
Chain Length: Ensure you purchase a chain that is the correct length for your 18-inch bar. The number of drive links will vary depending on the bar manufacturer. Consult your bar’s specifications or your chainsaw’s manual to determine the correct chain length.
Chain Sharpness: A sharp chain is essential for efficient cutting. Dull chains require more force, which puts strain on the chainsaw’s engine and can lead to increased wear and tear. Invest in a good chain sharpener and learn how to sharpen your chain properly.

Cost Considerations:

Full Chisel Chain (18-inch): $20 – $30
Semi-Chisel Chain (18-inch): $18 – $28
Low-Kickback Chain (18-inch): $22 – $32
Chain Sharpener (Manual): $15 – $30
Chain Sharpener (Electric): $50 – $150

Data Source: Amazon, Home Depot, and specialty chainsaw retailers (as of October 2024).

Expert Tip: I always keep a spare chain on hand. That way, if my chain gets damaged or dull while I’m working, I can quickly swap it out and get back to cutting.

2. Carburetor Adjustment: Optimizing Fuel Delivery

When you increase the bar length, you’re asking the engine to work harder. A properly adjusted carburetor ensures that the engine is receiving the correct fuel-air mixture for optimal performance.

Why Adjust the Carburetor? A longer bar requires more power to pull the chain through the wood. If the carburetor is not adjusted properly, the engine may run lean (too much air, not enough fuel) or rich (too much fuel, not enough air). A lean condition can lead to overheating and engine damage, while a rich condition can cause poor performance and excessive smoke.
How to Adjust the Carburetor: The MS170 carburetor typically has three adjustment screws:
- L (Low-Speed): Controls the fuel-air mixture at idle and low speeds.
- H (High-Speed): Controls the fuel-air mixture at high speeds.
- LA (Idle Speed): Adjusts the engine’s idle speed.
The Adjustment Process:
1. Warm-up the Engine: Start the chainsaw and let it run for a few minutes to warm up.
2. Adjust the Idle Speed: Turn the LA screw until the chain stops moving at idle.
3. Adjust the Low-Speed: Turn the L screw until the engine idles smoothly and accelerates cleanly.
4. Adjust the High-Speed: This is the trickiest part. You’ll need to listen carefully to the engine. Slowly turn the H screw until the engine runs smoothly at full throttle. Avoid running the engine too lean, as this can cause damage. A slight four-stroking sound at full throttle is ideal.
Using a Tachometer: For more precise adjustments, you can use a tachometer to measure the engine’s RPM. Consult your chainsaw’s manual for the recommended RPM range.

Cost Considerations:

Carburetor Adjustment Tool: $10 – $20
Tachometer: $20 – $50

Data Source: Amazon, Home Depot, and specialty chainsaw retailers (as of October 2024).

Caution: If you are not comfortable adjusting the carburetor yourself, it’s best to take your chainsaw to a qualified technician. Incorrect adjustments can damage the engine.

Personal Experience: I remember trying to adjust my carburetor without a tachometer. I thought I had it dialed in, but after a few hours of cutting, the engine started to overheat. I learned my lesson and invested in a tachometer. It made the adjustment process much easier and more accurate.

3. Exhaust Modification (Optional): Enhancing Engine Performance

Some users choose to modify the exhaust system to improve engine performance. This typically involves removing or modifying the muffler to increase exhaust flow.

Why Modify the Exhaust? A restrictive exhaust system can limit engine power. By increasing exhaust flow, you can potentially increase the engine’s horsepower and torque.
Types of Exhaust Modifications:
- Muffler Modification: This involves drilling additional holes in the muffler or removing internal baffles.
- Aftermarket Muffler: These are specially designed mufflers that offer improved exhaust flow compared to the stock muffler.
Considerations:
- Noise: Exhaust modifications can significantly increase the chainsaw’s noise level. Be mindful of noise regulations in your area.
- Warranty: Modifying the exhaust system may void your chainsaw’s warranty.
- Safety: Ensure that any exhaust modifications are done safely and do not create a fire hazard.
Alternative: High-Performance Muffler Cap: A less extreme option is to replace the stock muffler cap with a high-performance version that allows for better exhaust flow without significantly increasing noise.

Cost Considerations:

High-Performance Muffler Cap: $15 – $30
Aftermarket Muffler: $50 – $100

Data Source: Amazon, eBay, and specialty chainsaw retailers (as of October 2024).

Disclaimer: I am not advocating for illegal or unsafe modifications. Always follow local regulations and prioritize safety.

4. Sprocket Upgrade (Optional): Optimizing Chain Speed and Torque

The sprocket is the toothed wheel that drives the chain. Upgrading to a different sprocket can affect the chain’s speed and torque.

Types of Sprockets:
- Spur Sprocket: This is the most common type of sprocket. It is simple and reliable.
- Rim Sprocket: This type of sprocket has a replaceable rim, which can be replaced when it wears out. This is a more economical option than replacing the entire sprocket.
Sprocket Size: The number of teeth on the sprocket affects the chain’s speed and torque. A smaller sprocket will increase the chain’s torque but decrease its speed, while a larger sprocket will increase the chain’s speed but decrease its torque.
Considerations:
- Cutting Conditions: If you are cutting mostly hardwoods, a smaller sprocket may be beneficial for increasing torque. If you are cutting mostly softwoods, a larger sprocket may be preferable for increasing speed.
- Engine Power: Ensure that the sprocket you choose is appropriate for the engine’s power. Using a sprocket that is too large can overload the engine.

Cost Considerations:

Rim Sprocket Kit: $20 – $40

Data Source: Amazon, eBay, and specialty chainsaw retailers (as of October 2024).

5. Maintaining Proper Chain Tension

Regardless of the bar length, maintaining proper chain tension is crucial for safety and performance.

Why is Chain Tension Important?
- Safety: A loose chain can derail and cause injury.
- Performance: A chain that is too tight can bind and overheat, while a chain that is too loose can vibrate and cut poorly.
- Bar and Chain Life: Proper chain tension helps to prolong the life of the bar and chain.
How to Adjust Chain Tension:
1. Loosen the Bar Nuts: Use a wrench to loosen the bar nuts that hold the bar in place.
2. Adjust the Tensioning Screw: Use a screwdriver to turn the tensioning screw until the chain is snug against the bar.
3. Tighten the Bar Nuts: Tighten the bar nuts securely.
4. Check the Tension: The chain should be able to be pulled away from the bar slightly, but it should not sag.

Expert Tip: Check the chain tension frequently, especially when the chain is new. New chains tend to stretch more than older chains.

6. Regular Maintenance: Keeping Your MS170 in Top Shape

Regular maintenance is essential for keeping your MS170 running smoothly and reliably.

Air Filter: Clean the air filter regularly to ensure that the engine is receiving adequate airflow. A dirty air filter can restrict airflow and cause the engine to run poorly.
Spark Plug: Replace the spark plug annually or as needed. A worn spark plug can cause the engine to misfire.
Fuel Filter: Replace the fuel filter annually or as needed. A clogged fuel filter can restrict fuel flow and cause the engine to stall.
Bar Oil: Use a high-quality bar oil to lubricate the chain and bar. Proper lubrication helps to reduce friction and wear.
Sharpening: Keep the chain sharp. A dull chain requires more force and can be dangerous.

Cost Considerations:

Air Filter: $5 – $10
Spark Plug: $3 – $5
Fuel Filter: $2 – $4
Bar Oil (1 gallon): $15 – $25

Data Source: Amazon, Home Depot, and specialty chainsaw retailers (as of October 2024).

Budgeting for Your MS170 Upgrade

Upgrading your MS170 can be a rewarding experience, but it’s important to budget carefully. Here’s a breakdown of the potential costs:

18-Inch Bar: $30 – $100
Chain: $18 – $32
Carburetor Adjustment Tool: $10 – $20
Tachometer (Optional): $20 – $50
High-Performance Muffler Cap (Optional): $15 – $30
Rim Sprocket Kit (Optional): $20 – $40
Maintenance Supplies: $25 – $40

Total Estimated Cost: $138 – $312 (depending on the upgrades you choose)

Pro Tip: Shop around and compare prices from different retailers. You may be able to save money by purchasing parts online or during sales.

Safety First: Prioritizing Safe Chainsaw Operation

Chainsaws are powerful tools that can be dangerous if not used properly. Always follow these safety guidelines:

Wear Appropriate Safety Gear: Always wear safety glasses, hearing protection, gloves, and sturdy boots.
Read the Manual: Familiarize yourself with the chainsaw’s operating instructions and safety precautions.
Inspect the Chainsaw: Before each use, inspect the chainsaw for any damage or loose parts.
Clear the Work Area: Clear the work area of any obstacles or hazards.
Use Proper Cutting Techniques: Use proper cutting techniques to avoid kickback and other hazards.
Never Cut Above Shoulder Height: Cutting above shoulder height is dangerous and can lead to loss of control.
Be Aware of Your Surroundings: Be aware of your surroundings and watch out for other people, animals, and obstacles.
Take Breaks: Take frequent breaks to avoid fatigue. Fatigue can impair your judgment and increase the risk of accidents.

Remember: Safety is always the top priority. If you are not comfortable operating a chainsaw, seek professional training.

Alternative Solutions: When Upgrading Isn’t Enough

While these upgrades can significantly improve the performance of your MS170 with an 18-inch bar, there may come a point where it’s simply not enough. If you find that your chainsaw is consistently struggling to handle larger logs, it may be time to consider purchasing a more powerful chainsaw.

Consider a Larger Chainsaw: Chainsaws with larger engines and longer bars are designed for heavy-duty cutting tasks.
Rent a Chainsaw: If you only need to cut large logs occasionally, renting a larger chainsaw may be a more cost-effective option than purchasing one.

Cost Considerations:

Stihl MS271 Farm Boss (18-inch): $450 – $550 (This is a popular mid-range chainsaw that offers significantly more power than the MS170)
Chainsaw Rental (Daily Rate): $50 – $100 (depending on the size and power of the chainsaw)

Data Source: Home Depot, Lowe’s, and local rental companies (as of October 2024).

Case Study: My Firewood Project

I recently undertook a project to cut and split several cords of firewood. I started with my trusty MS170 and an 18-inch bar, along with the upgrades I mentioned earlier. While the MS170 performed admirably on smaller logs (up to 12 inches in diameter), it struggled with the larger rounds of oak and maple.

The Challenge: The larger logs required multiple passes to cut through, which was time-consuming and put a strain on the chainsaw. The engine also tended to bog down, especially when cutting through knots.
The Solution: I ended up renting a larger chainsaw (a Stihl MS271 Farm Boss) for the larger logs. This made the job much easier and faster.
The Lesson: While the MS170 with upgrades was sufficient for smaller firewood projects, it was not the right tool for the job when dealing with larger logs.

This experience reinforced the importance of choosing the right tool for the task. While upgrades can improve the performance of your MS170, they cannot overcome its inherent limitations.

Real-World Cost Examples: From Forest to Fireplace

Let’s break down the costs involved in preparing firewood, from harvesting the wood to stacking it in your backyard. This will give you a better understanding of the overall expenses and how the MS170 and its upgrades fit into the picture.

Scenario 1: Harvesting Your Own Firewood

Location: Rural area with access to a woodlot.
Wood Species: Mixed hardwoods (oak, maple, ash).
Equipment: Stihl MS170 with 18-inch bar and upgrades, chainsaw safety gear, splitting maul, wedges, tractor with trailer.

Cost Breakdown:

Chainsaw and Upgrades: $250 (initial investment)
Fuel and Oil: $50 (per cord)
Chainsaw Maintenance: $20 (per cord)
Tractor Fuel: $30 (per cord)
Labor (Your Time): This is the tricky part. Let’s estimate your time at $20 per hour, and assume it takes 8 hours to harvest and process a cord of wood. That’s $160.
Total Cost Per Cord: $510 (excluding initial chainsaw investment)

Scenario 2: Purchasing Firewood

Location: Suburban area.
Wood Species: Seasoned hardwood mix.
Delivery: Firewood delivered to your home.

Cost Breakdown:

Price per Cord (Delivered): $250 – $400 (depending on location and wood species)

Data Source: Local firewood suppliers (as of October 2024).

Comparison:

As you can see, harvesting your own firewood can be more expensive than purchasing it, especially when you factor in your time. However, many people enjoy the process of harvesting their own wood, and it can be a good way to get exercise and spend time outdoors.

Cost Optimization Tips:

Harvest Wood During Off-Peak Season: Wood prices tend to be lower during the spring and summer months.
Buy in Bulk: Purchasing larger quantities of firewood can often result in lower prices per cord.
Season Your Own Wood: Purchasing green (unseasoned) wood is typically cheaper than purchasing seasoned wood. However, you will need to allow the wood to dry for at least six months before burning it.
Maintain Your Chainsaw: Regular maintenance can help to prolong the life of your chainsaw and reduce repair costs.

The Future of Wood Processing: Innovation and Sustainability

The world of wood processing is constantly evolving. New technologies and techniques are emerging that are making the process more efficient, sustainable, and safe.

Electric Chainsaws: Electric chainsaws are becoming increasingly popular due to their quiet operation, low emissions, and ease of use. While they may not be as powerful as gas-powered chainsaws, they are a good option for small to medium-sized tasks.
Robotics and Automation: Robotics and automation are being used in larger-scale wood processing operations to improve efficiency and reduce labor costs.
Sustainable Forestry Practices: Sustainable forestry practices are becoming increasingly important as we strive to protect our forests for future generations. These practices involve managing forests in a way that ensures their long-term health and productivity.
Biofuel Production: Wood is being used as a feedstock for biofuel production. This is a promising way to reduce our reliance on fossil fuels.

Global Timber Prices: A Snapshot

Understanding global timber prices can provide valuable context for your wood processing projects. Timber prices vary widely depending on the species, quality, and location.

North America: Softwood lumber prices have been volatile in recent years due to supply chain disruptions and increased demand. Prices for hardwoods, such as oak and maple, have been more stable.
Europe: Timber prices in Europe have been affected by factors such as the war in Ukraine and the rising cost of energy.
Asia: Demand for timber in Asia is growing rapidly, driven by economic growth and urbanization.

Data Source: Forest Economic Advisors, Random Lengths, and other industry sources (as of October 2024).

Important Note: Timber prices are constantly changing. It’s important to stay informed about the latest market trends.

Actionable Takeaways and Next Steps

So, you’ve made it through the deep dive! Here are the key takeaways and next steps for upgrading your Stihl MS170 with an 18-inch bar:

Assess Your Needs: Determine the types of cutting tasks you’ll be performing and whether an 18-inch bar is truly necessary.
Choose the Right Bar: Select a high-quality bar that is compatible with your MS170.
Upgrade Your Chain: Invest in a sharp, durable chain that is appropriate for the type of wood you’ll be cutting.
Adjust the Carburetor: Ensure that the engine is receiving the correct fuel-air mixture.
Consider Optional Upgrades: Evaluate the benefits of exhaust modifications and sprocket upgrades.
Maintain Proper Chain Tension: Check the chain tension frequently and adjust as needed.
Perform Regular Maintenance: Keep your chainsaw in top shape by cleaning the air filter, replacing the spark plug, and lubricating the chain.
Prioritize Safety: Always wear appropriate safety gear and follow safe operating procedures.
Budget Carefully: Plan your budget and shop around for the best prices.
Know Your Limits: Recognize when it’s time to consider a larger chainsaw or rent equipment.

Next Steps:

Research: Spend some time researching different bars, chains, and upgrades. Read reviews and compare prices.
Consult with Experts: Talk to experienced chainsaw users or technicians for advice.
Start Small: Begin with the most essential upgrades (bar and chain) and gradually add more as needed.
Practice: Get comfortable using your upgraded chainsaw in a safe and controlled environment.

The journey of upgrading your Stihl MS170 with an 18-inch bar is a testament to the adaptability and utility of this little saw. By following these expert tips, you can transform your MS170 into a more versatile and capable cutting machine. Remember to prioritize safety, budget carefully, and enjoy the process of working with wood. Good luck, and happy cutting!

Stihl Chainsaw Bar 18 Inch: Best Upgrades for MS170 (Expert Tips)