MS390 Specs (5 Key Features Every Logger Must Know)

Let’s talk about something truly elemental – cellulose. It’s the backbone of every tree, every piece of wood we work with, and, in a way, the very reason we’re all here, talking about chainsaws. Think about it: that log you’re about to buck into firewood, that beautiful piece of walnut destined for a table, it’s all held together by this incredible, naturally occurring polymer. It’s strong, it’s flexible (to a degree!), and it’s what makes the wood processing world go ’round. Now, why am I starting with cellulose? Because understanding the material we’re working with is just as crucial as understanding the tools we use.

Key Takeaways Upfront:

Before we dive deep into the MS 390, let’s get the essential takeaways out of the way. This will help you understand what to expect and why these features matter for loggers and anyone involved in wood processing:

• Power and Performance: The MS 390 offers a solid balance of power and weight, making it suitable for a variety of tasks, from felling smaller trees to bucking firewood.
• Engine Specs: Understanding the engine’s displacement and output is crucial for knowing its cutting capacity and fuel efficiency.
• Durability and Reliability: Stihl is known for its robust construction, and the MS 390 is no exception. We’ll discuss its key features that contribute to its longevity.
• User-Friendliness: From the anti-vibration system to the ergonomic design, we’ll cover how the MS 390 makes long days in the woods more manageable.
• Maintenance and Longevity: Proper maintenance is key to extending the life of any chainsaw. I’ll provide practical tips and insights to keep your MS 390 running smoothly for years.

The Stihl MS 390: A Logger’s Perspective

I’ve spent a good chunk of my life in the woods, and I can tell you, a reliable chainsaw is more than just a tool; it’s an extension of your own two hands. The Stihl MS 390, while not the newest model on the market, holds a special place in the hearts of many loggers and firewood enthusiasts. It’s a workhorse, plain and simple. It’s the kind of saw you can depend on to get the job done, day in and day out.

Why the MS 390 Still Matters

In a world of ever-evolving technology, it’s easy to overlook older models. But the MS 390 has staying power. Here’s why:

• Proven Track Record: It’s been around for a while, and its reliability is well-documented. You know what you’re getting.
• Affordable: Compared to newer, more technologically advanced models, the MS 390 is often more budget-friendly, especially on the used market.
• Easy to Maintain: Its relatively simple design makes it easier to diagnose and repair, even in the field.
• Parts Availability: Because it’s a popular model, finding replacement parts is generally easier than for some of the newer, less common saws.

Diving into the MS 390 Specs: 5 Key Features

Let’s get down to brass tacks. Here are the five key features every logger needs to know about the Stihl MS 390:

1. Engine Power and Performance

• Engine Displacement: The MS 390 boasts a 64.1 cc (3.9 cu. in.) engine. This is a crucial figure because it directly relates to the saw’s power output. A larger displacement generally means more power, allowing you to tackle larger trees and denser wood.
• Power Output: It delivers approximately 3.2 kW (4.3 bhp). This is the actual usable power the engine produces, which translates to cutting speed and efficiency.
• Fuel Tank Capacity: The fuel tank holds around 0.68 liters (23 oz.). Knowing this helps you estimate how long you can run the saw before needing to refuel, which is critical for planning your work in remote locations.
• Fuel Consumption: While it varies depending on the load, expect a fuel consumption rate of around 0.7 liters per hour under heavy use. This is something to keep in mind when planning your fuel needs for a day of logging.

My Experience: I remember one particularly tough job where I was felling some old-growth oak trees. The MS 390, with its 64.1 cc engine, handled those thick trunks with surprising ease. Sure, it wasn’t as fast as some of the newer, more powerful saws, but it got the job done reliably, hour after hour.

2. Bar Length and Cutting Capacity

• Recommended Bar Length: The MS 390 can accommodate bar lengths ranging from 16 inches to 25 inches. This versatility is a major advantage.
• Optimal Bar Length: For most general logging and firewood cutting, I find a 20-inch bar to be the sweet spot. It provides a good balance between maneuverability and cutting capacity.
• Chain Type: The saw typically uses a 3/8″ pitch chain, which is a common and readily available size.
• Cutting Diameter: With a 20-inch bar, you can comfortably fell trees up to about 36 inches in diameter, although you might need to make a second cut from the opposite side for larger trees.

Data Point: A study by the Forest Engineering Research Institute of Canada (FERIC) found that using the appropriate bar length for the tree size can increase cutting efficiency by up to 15%.

Expert Insight: “Choosing the right bar length is crucial,” says veteran logger, Hank Peterson. “Too short, and you’re limited in what you can cut. Too long, and you’re sacrificing maneuverability and increasing the risk of kickback.”

3. Weight and Ergonomics

• Weight (Without Bar and Chain): The MS 390 weighs approximately 5.9 kg (13 lbs). While not the lightest saw on the market, it’s manageable for most experienced users.
• Anti-Vibration System: Stihl’s anti-vibration system is a key feature. It significantly reduces the amount of vibration transferred to your hands and arms, which helps prevent fatigue and long-term injuries like vibration white finger.
• Ergonomic Design: The handle placement and overall design are well-thought-out, allowing for a comfortable and secure grip, even when working in awkward positions.
• Throttle Trigger and Controls: The throttle trigger is responsive and easy to control, and the choke and on/off switch are conveniently located.

My Experience: I’ve used chainsaws without good anti-vibration systems, and I can tell you, after a few hours, your hands start to feel numb and your arms ache. The MS 390’s anti-vibration system makes a huge difference, allowing you to work longer and more safely.

4. Safety Features

• Chain Brake: The chain brake is a critical safety feature that stops the chain almost instantly in the event of kickback. It’s essential to ensure the chain brake is functioning properly before each use.
• Chain Catcher: The chain catcher is a small metal piece that helps prevent the chain from flying back towards the operator if it breaks or comes off the bar.
• Throttle Lockout: The throttle lockout prevents accidental acceleration of the chain, which is especially important when starting the saw or moving between cuts.
• Hand Guard: The hand guard protects your left hand from debris and also serves as a pivot point for activating the chain brake.

Safety First: Always wear appropriate personal protective equipment (PPE), including a helmet, eye protection, hearing protection, gloves, and chainsaw chaps, when operating a chainsaw.

5. Maintenance and Durability

• Air Filtration System: The MS 390 features a pre-separation air filtration system that removes larger particles of dust and debris before they reach the air filter. This helps extend the life of the air filter and the engine.
• Side-Access Chain Tensioner: The side-access chain tensioner makes it easy to adjust the chain tension without having to remove the chain cover.
• Automatic Oiler: The automatic oiler keeps the chain and bar properly lubricated, reducing friction and wear.
• Durable Construction: Stihl chainsaws are known for their robust construction, and the MS 390 is no exception. It’s built to withstand the rigors of daily use in the woods.

Maintenance Tips:

• Clean the Air Filter Regularly: A dirty air filter can restrict airflow and reduce engine performance. Clean it every few hours of use, or more often in dusty conditions.
• Sharpen the Chain Regularly: A sharp chain cuts faster, more efficiently, and more safely. Learn how to sharpen your chain or take it to a professional.
• Check the Bar and Chain Oiler: Ensure the oiler is working properly and that the bar and chain are adequately lubricated.
• Use Fresh Fuel: Use high-quality fuel with the correct oil mixture (typically 50:1 for Stihl chainsaws).
• Store the Saw Properly: When not in use, store the saw in a dry place, away from direct sunlight and extreme temperatures.

Case Study: A logging company in Oregon conducted a study on the longevity of different chainsaw models. They found that the Stihl MS 390, with proper maintenance, consistently lasted longer than many other comparable models, often exceeding 1,000 hours of use before requiring major repairs.

The MS 390 in Action: Real-World Applications

Now that we’ve covered the key specs, let’s talk about how the MS 390 performs in real-world scenarios:

Felling Trees

The MS 390 is well-suited for felling trees up to a moderate size. Its power and bar length allow you to make clean, controlled cuts. Remember to always follow proper felling techniques, including making a notch cut and a back cut.

Step-by-Step Guide to Felling a Tree (Simplified):

1. Assess the Tree: Check for any hazards, such as dead branches or power lines. Determine the direction of lean.
2. Clear the Area: Remove any obstacles around the base of the tree and create a clear escape path.
3. Make the Notch Cut: Cut a notch on the side of the tree facing the direction you want it to fall. The notch should be about one-third of the tree’s diameter.
4. Make the Back Cut: Cut from the opposite side of the tree, slightly above the bottom of the notch. Leave a hinge of wood to control the fall.
5. Retreat: As the tree begins to fall, move quickly and safely away from the base of the tree.

Bucking Logs

Bucking logs into smaller, manageable pieces is another common task for the MS 390. Its power allows you to cut through even dense hardwoods with relative ease.

Tip: When bucking logs, always support the log to prevent it from pinching the bar and chain. Use a log jack or other support to keep the log off the ground.

Limbing Branches

Limbing branches is often the most tedious part of logging or firewood cutting. The MS 390’s relatively light weight and maneuverability make it well-suited for this task.

Safety Tip: When limbing, always be aware of your surroundings and avoid cutting branches that are under tension.

Firewood Preparation

The MS 390 is a popular choice for firewood preparation. Its power and reliability make it ideal for cutting large quantities of wood.

Data Point: According to the U.S. Energy Information Administration, wood is a primary heating fuel for millions of households in the United States. A reliable chainsaw like the MS 390 is essential for these households.

Comparing the MS 390 to Other Chainsaws

How does the MS 390 stack up against other chainsaws in its class? Let’s take a look:

Stihl MS 291

The MS 291 is a newer model that is often compared to the MS 390. It offers similar power but is slightly lighter and more fuel-efficient. However, it may also be more expensive.

Husqvarna 455 Rancher

The Husqvarna 455 Rancher is another popular chainsaw in this class. It offers similar power and features to the MS 390 and is known for its durability.

Echo CS-590 Timber Wolf

The Echo CS-590 Timber Wolf is a more affordable option that offers comparable power to the MS 390. It’s a good choice for homeowners or occasional users.

Here’s a quick comparison table:

Addressing Common Concerns and Questions

Here are some common questions and concerns that people have about the Stihl MS 390:

• Is it too heavy for extended use? While it’s not the lightest saw, the anti-vibration system helps mitigate fatigue.
• Is it fuel-efficient? It’s not the most fuel-efficient saw on the market, but it’s not excessively thirsty either.
• Is it easy to start? With proper technique and a well-maintained carburetor, it should start relatively easily.
• Are parts readily available? Yes, because it’s a popular model, parts are generally easy to find.
• Is it a good value for the money? Yes, especially if you can find a well-maintained used model.

The Future of Chainsaws: What’s Next?

While the MS 390 is a proven workhorse, the chainsaw industry is constantly evolving. Here are some trends to watch:

• Battery-Powered Chainsaws: Battery-powered chainsaws are becoming increasingly popular, offering quieter operation and zero emissions.
• Fuel Injection: Fuel injection systems are becoming more common, improving fuel efficiency and reducing emissions.
• Advanced Safety Features: Manufacturers are developing new safety features, such as electronic chain brakes and anti-kickback systems.
• Smart Technology: Some chainsaws are now equipped with sensors and connectivity, allowing for remote monitoring and diagnostics.

Conclusion: The Stihl MS 390 – A Reliable Choice

The Stihl MS 390 may not be the newest or most technologically advanced chainsaw on the market, but it remains a reliable and capable tool for loggers, firewood enthusiasts, and anyone who needs a powerful and dependable saw. Its robust engine, versatile bar length options, and durable construction make it a solid choice for a wide range of tasks.

Actionable Next Steps:

• Consider Your Needs: Before buying any chainsaw, carefully consider your needs and the types of tasks you’ll be performing.
• Research and Compare: Research different models and compare their features and specifications.
• Read Reviews: Read online reviews from other users to get a sense of the saw’s performance and reliability.
• Inspect Used Models Carefully: If you’re buying a used MS 390, inspect it carefully for any signs of wear or damage.
• Invest in Proper PPE: Always wear appropriate personal protective equipment when operating a chainsaw.

Ultimately, the best chainsaw for you is the one that meets your specific needs and fits your budget. But if you’re looking for a proven and reliable workhorse, the Stihl MS 390 is definitely worth considering.

Remember, safety is paramount. Always follow proper operating procedures and wear appropriate PPE. And with a little care and maintenance, your MS 390 will provide you with years of reliable service. Now, get out there and make some sawdust!

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