MS 390 Stihl Specs: Key Features Compared (5 Expert Insights)

The Stihl MS 390 is a chainsaw that has earned its reputation for being a dependable and powerful tool. It’s not the newest model on the market, but its robust design and proven track record continue to make it a popular choice for both homeowners and professionals. Let’s delve into the key features that define this chainsaw and compare them to other models in its class.

1. Engine Power and Performance: A Solid Workhorse

The heart of any chainsaw is its engine. The Stihl MS 390 boasts a 64.1 cc two-stroke engine. This displacement translates to a power output of approximately 4.4 brake horsepower (bhp).

What this means: This power level positions the MS 390 as a mid-range chainsaw, capable of handling a wide variety of tasks, from felling medium-sized trees to bucking logs for firewood.
My Experience: I’ve used the MS 390 to fell trees up to 24 inches in diameter, and it handled the job with relative ease. While it might not be the fastest saw for larger trees, its consistent power delivery ensures a smooth and efficient cut.
Comparison: Compared to smaller chainsaws like the Stihl MS 250 (around 45cc), the MS 390 offers significantly more power. However, it’s not as powerful as larger professional saws like the Stihl MS 462 (around 72cc). The MS 390 strikes a balance between power and weight, making it a versatile option.
Data and Insights: In my experience, the MS 390 performs best when used with a 18-inch or 20-inch bar. This combination allows the engine to operate within its optimal power range, preventing excessive strain and ensuring efficient cutting. Using a longer bar (e.g., 25-inch) can bog down the engine, especially when cutting hardwoods.
Fuel Consumption: Two-stroke engines are notorious for fuel consumption. The MS 390 is no exception. Expect to refuel relatively frequently, especially during heavy use. I recommend keeping a supply of pre-mixed fuel (50:1 ratio of gasoline to two-stroke oil) on hand.

2. Weight and Balance: Finding the Sweet Spot

Weight is a crucial factor to consider when choosing a chainsaw. A heavier saw can lead to fatigue, especially during prolonged use. The Stihl MS 390 weighs approximately 13.9 pounds (6.3 kg) without the bar and chain.

What this means: This weight is fairly typical for a chainsaw in its power class. It’s not the lightest saw, but it’s also not excessively heavy.
My Experience: I’ve found the MS 390 to be reasonably well-balanced, making it comfortable to use for extended periods. The ergonomic design of the handles also contributes to user comfort.
Comparison: Compared to lighter chainsaws like the Stihl MS 170 (around 9 pounds), the MS 390 requires more physical effort to operate. However, the added weight contributes to its stability and cutting power.
Strategic Advantage: The weight and balance of the MS 390 make it well-suited for felling trees and bucking logs. Its stability allows for precise cuts, while its manageable weight prevents excessive fatigue.
Case Study: I once spent an entire day bucking firewood with the MS 390. While I was definitely tired by the end of the day, I didn’t experience the same level of fatigue that I would have with a heavier, less balanced chainsaw.

3. Bar and Chain: Choosing the Right Cutting System

The bar and chain are the cutting components of a chainsaw. The Stihl MS 390 is typically used with bar lengths ranging from 16 inches to 20 inches. The chain pitch is typically 3/8″ and the gauge is .050″.

What this means: The bar length determines the maximum diameter of trees that can be felled or logs that can be bucked. The chain pitch and gauge affect the cutting speed and smoothness.
My Experience: I prefer using an 18-inch bar on my MS 390 for most tasks. This length provides a good balance between cutting capacity and maneuverability.
Chain Selection: The type of chain you use can significantly impact the chainsaw’s performance. I recommend using a full-chisel chain for felling trees and bucking logs, as it provides a faster and more aggressive cut. For limbing and smaller tasks, a semi-chisel chain is a good option.
Maintenance: Proper chain maintenance is essential for optimal performance. Keep the chain sharp by filing it regularly. A dull chain will not only cut poorly but also put excessive strain on the engine.
Original Insight: I’ve found that using a chain sharpener with a guide helps to maintain the correct filing angle and depth, resulting in a sharper and longer-lasting chain.
Safety Note: Always wear appropriate safety gear, including eye protection, gloves, and chaps, when operating a chainsaw.

4. Features and Technology: Simplicity and Reliability

The Stihl MS 390 is not packed with advanced technology. Instead, it focuses on simplicity and reliability.

Chain Brake: The MS 390 features a chain brake that stops the chain immediately in the event of kickback. This is a crucial safety feature that can prevent serious injuries.
Anti-Vibration System: The chainsaw is equipped with an anti-vibration system that reduces the amount of vibration transmitted to the operator. This helps to minimize fatigue during prolonged use.
Side-Access Chain Tensioner: The chain tensioner is located on the side of the chainsaw, making it easy to adjust the chain tension without having to remove the chain cover.
Master Control Lever: The master control lever combines the choke, throttle, and on/off switch into a single control. This simplifies the starting process.
Lack of Complexity: The absence of complex electronic systems makes the MS 390 relatively easy to maintain and repair.
Strategic Advantage: The simplicity of the MS 390 makes it a reliable and dependable tool, even in demanding conditions.

5. Durability and Maintenance: Built to Last

The Stihl MS 390 is known for its durability and longevity. With proper maintenance, this chainsaw can provide years of reliable service.

Robust Construction: The MS 390 is built with high-quality materials and components, making it resistant to wear and tear.
Regular Maintenance: To ensure optimal performance and longevity, it’s essential to perform regular maintenance tasks, such as cleaning the air filter, replacing the spark plug, and lubricating the bar and chain.
Air Filter: A clean air filter is crucial for proper engine performance. I recommend cleaning the air filter after each use, especially in dusty conditions.
Spark Plug: Replace the spark plug annually or as needed. A worn spark plug can cause starting problems and reduce engine performance.
Bar and Chain Lubrication: Keep the bar and chain properly lubricated to prevent excessive wear and tear. Use a high-quality bar and chain oil.
My Experience: I’ve owned my MS 390 for over 10 years, and it’s still running strong. The key to its longevity has been regular maintenance and proper use.
Cost Considerations: While the initial cost of the MS 390 may be higher than some other chainsaws, its durability and longevity make it a worthwhile investment in the long run.

Diving Deeper: Practical Applications and Techniques

Now that we’ve covered the key features of the Stihl MS 390, let’s explore some practical applications and techniques for using this chainsaw effectively.

Felling Trees: A Step-by-Step Guide

Felling trees is a dangerous task that should only be undertaken by experienced individuals who have received proper training. However, for those who are qualified, the MS 390 can be a valuable tool.

Assess the Situation: Before felling a tree, carefully assess the situation. Identify the lean of the tree, the direction of the wind, and any potential hazards, such as power lines or buildings.
Clear the Area: Clear a wide area around the tree to ensure a safe escape route. Remove any obstacles, such as brush or rocks.
Make the Notch: 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.
Make the Back Cut: Make a back cut on the opposite side of the tree, slightly above the notch. Leave a hinge of wood to control the direction of the fall.
Wedge the Cut: Insert a felling wedge into the back cut to help guide the tree’s fall.
Push the Tree: Use a felling lever or other tool to push the tree over in the desired direction.
Escape Route: As the tree begins to fall, move quickly to your pre-planned escape route.
Safety First: Always wear appropriate safety gear, including a hard hat, eye protection, hearing protection, and chaps.
Strategic Insight: Understanding the lean of the tree and the wind direction is crucial for controlling the direction of the fall.

Bucking Logs: Preparing Firewood

Bucking logs is the process of cutting logs into shorter lengths for firewood or other purposes. The MS 390 is well-suited for this task.

Secure the Log: Secure the log in place using log stands or other supports.
Plan Your Cuts: Plan your cuts carefully to maximize the yield of firewood.
Make the Cuts: Use the chainsaw to cut the log into the desired lengths.
Avoid Pinching: Be careful to avoid pinching the chain, which can occur when the weight of the log closes the cut. Use wedges to keep the cut open.
Efficiency Tip: Use a log splitter to split the firewood into smaller pieces for easier drying and burning.
Wood Type Selection: Different types of wood have different burning characteristics. Hardwoods, such as oak and maple, burn longer and hotter than softwoods, such as pine and fir.

Debarking Logs: Preparing Wood for Projects

Debarking logs is the process of removing the bark from the logs. This is often done to prepare the wood for projects, such as building furniture or cabins.

Tools: While chainsaws can be used carefully for debarking, I generally don’t recommend it. It’s far too easy to damage the wood. I prefer using a drawknife or a specialized debarking tool.
Technique: If you must use a chainsaw, use it very carefully to score the bark in sections. Then, use a pry bar or a specialized debarking tool to peel the bark off.
Moisture Content Targets: The ideal moisture content for woodworking projects is typically between 6% and 8%.
Drying Methods: Air drying is a common method for drying wood. It involves stacking the wood in a well-ventilated area and allowing it to dry naturally. Kiln drying is a faster method that involves using a kiln to control the drying process.

Safety Considerations: A Paramount Concern

Operating a chainsaw is inherently dangerous. It’s crucial to prioritize safety at all times.

Personal Protective Equipment (PPE): Always wear appropriate PPE, including:
- Hard Hat: To protect your head from falling debris.
- Eye Protection: To protect your eyes from flying chips and debris.
- Hearing Protection: To protect your ears from the loud noise of the chainsaw.
- Gloves: To protect your hands from cuts and abrasions.
- Chaps: To protect your legs from chainsaw cuts.
- Steel-Toed Boots: To protect your feet from falling logs and other hazards.
- Safe Operating Practices:
- Read the Owner’s 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 defects.
- Start the Chainsaw Safely: Start the chainsaw on a flat, stable surface. Keep your feet firmly planted and hold the chainsaw securely.
- Maintain a Safe Distance: Keep a safe distance from other people and objects when operating the chainsaw.
- Be Aware of Kickback: Kickback is a sudden and violent reaction that can occur when the chainsaw chain comes into contact with a solid object. Be aware of the potential for kickback and take steps to avoid it.
- Never Cut Above Your Head: Cutting above your head is extremely dangerous and should be avoided at all costs.
- Take Breaks: Take frequent breaks to avoid fatigue.
- Never Operate Under the Influence: Never operate a chainsaw under the influence of alcohol or drugs.

Strategic Insights: Optimizing Your Wood Processing

Beyond the basic techniques, there are several strategic insights that can help you optimize your wood processing operations.

Wood Storage: Proper wood storage is essential for preventing rot and decay. Stack firewood in a well-ventilated area, off the ground.
Seasoning Firewood: Seasoning firewood involves drying it to reduce its moisture content. Seasoned firewood burns more efficiently and produces less smoke.
Efficient Splitting: Using a hydraulic log splitter can significantly increase the efficiency of splitting firewood.
Timber Handling: Using a log loader or skidder can make it easier to move large logs.
Cost Analysis: Conduct a cost analysis to determine the most cost-effective methods for wood processing.

Challenges Faced by Global DIYers and Small-Scale Logging Businesses

DIYers and small-scale logging businesses around the world face a variety of challenges, including:

Limited Resources: Limited access to capital, equipment, and training.
Safety Concerns: A lack of awareness of safety hazards and proper safety practices.
Environmental Regulations: Compliance with environmental regulations.
Market Access: Difficulty accessing markets for their products.
Geographic Isolation: Limited access to information and support.

Conclusion: The Stihl MS 390 – A Reliable Choice

The Stihl MS 390 is a solid, dependable chainsaw that has earned its place as a favorite among homeowners and professionals alike. Its powerful engine, manageable weight, and durable construction make it a versatile tool for a wide range of tasks. While it may not have all the bells and whistles of newer models, its simplicity and reliability are its greatest strengths.

If you’re looking for a chainsaw that can handle demanding tasks and provide years of reliable service, the Stihl MS 390 is definitely worth considering. Just remember to prioritize safety, perform regular maintenance, and use the chainsaw properly to get the most out of it.

Next Steps: Putting Knowledge into Action

Ready to start your own wood processing or firewood preparation projects? Here are some practical next steps:

Assess Your Needs: Determine the types of tasks you’ll be performing and the size of the trees or logs you’ll be working with.
Choose the Right Chainsaw: Based on your needs, select a chainsaw that is appropriate for the job. The Stihl MS 390 is a good option for many applications, but other models may be more suitable for specific tasks.
Gather Your Safety Gear: Make sure you have all the necessary safety gear before operating a chainsaw.
Practice Safe Operating Practices: Follow all safety precautions and operating instructions.
Start Small: Begin with small projects to gain experience and confidence.
Seek Training: Consider taking a chainsaw safety course to learn proper techniques and safety procedures.
Enjoy the Process: Wood processing can be a rewarding and fulfilling activity. Enjoy the process and take pride in your work.

By following these steps, you can safely and effectively use a chainsaw to process wood for firewood, woodworking projects, or other purposes. Remember to always prioritize safety and to take the time to learn proper techniques. With practice and patience, you can become a skilled and confident chainsaw operator.

MS 390 Stihl Specs: Key Features Compared (5 Expert Insights)