400c Stihl Chainsaw Review (5 Pro Tips For Peak Performance)

The resurgence of wood-burning stoves and fireplaces, coupled with a growing interest in sustainable heating solutions, has fueled a steady climb in the demand for firewood. Globally, the firewood market is projected to reach a staggering $35.6 billion by 2027, according to a recent report by Global Market Insights. This surge underscores the importance of efficient and safe wood processing techniques, especially when dealing with powerful tools like the Stihl MS 400 C-M chainsaw. Whether you’re a seasoned logger or a homeowner preparing for winter, understanding how to optimize your equipment is crucial.

Stihl MS 400 C-M Chainsaw Review: 5 Pro Tips for Peak Performance

As someone who’s spent countless hours in the woods, felling trees and processing timber, I’ve come to rely on the right tools to get the job done safely and efficiently. The Stihl MS 400 C-M chainsaw is a powerhouse, a mid-sized professional saw that boasts impressive power and performance. I remember the first time I fired up a Stihl chainsaw; it was a hand-me-down from my grandfather. The smell of the two-stroke engine, the vibration in my hands, and the satisfying feeling of cutting through wood – it was then I knew I was hooked.

This review isn’t just about specs and features; it’s about sharing practical insights I’ve gained over years of experience. I’ll delve into the nuances of this machine and provide five pro tips to help you unlock its full potential. Whether you’re tackling storm cleanup, felling trees for firewood, or milling lumber, these tips will help you achieve peak performance and extend the life of your MS 400 C-M.

Understanding the Stihl MS 400 C-M: A Deep Dive

Before we dive into the pro tips, let’s understand what makes the Stihl MS 400 C-M a valuable piece of equipment. This chainsaw is designed for professional use, offering a blend of power, durability, and advanced technology.

Engine: The MS 400 C-M features a 59.8 cc engine, delivering 4.0 kW (5.4 bhp) of power. This makes it suitable for felling trees up to 24 inches in diameter and handling demanding cutting tasks.
M-Tronic™ Engine Management System: This is where the “C-M” comes in. The M-Tronic™ system automatically adjusts the engine’s fuel mixture based on altitude, temperature, and fuel quality, ensuring optimal performance in various conditions.
Lightweight Design: Despite its power, the MS 400 C-M is relatively lightweight at around 12.8 pounds (without fuel and bar). This reduces operator fatigue during extended use.
Anti-Vibration System: Stihl’s anti-vibration technology minimizes vibrations transmitted to the operator, enhancing comfort and reducing the risk of hand-arm vibration syndrome (HAVS).
Side-Access Chain Tensioner: This feature allows for quick and easy chain adjustments, a crucial time-saver in the field.

Pro Tip #1: Mastering M-Tronic™ for Optimum Fuel Efficiency

The M-Tronic™ system is the brain of the MS 400 C-M, constantly monitoring and adjusting the engine to achieve optimal performance. However, to fully leverage its capabilities, you need to understand how it works and how to maintain it.

Fuel Quality is Key: The M-Tronic™ system relies on clean, high-quality fuel. Always use a premium fuel with an octane rating of 89 or higher. I recommend using ethanol-free fuel whenever possible, as ethanol can degrade rubber and plastic components in the fuel system over time, especially during prolonged storage.
Stihl MotoMix®: For ultimate peace of mind, consider using Stihl MotoMix®, a pre-mixed fuel specifically formulated for Stihl engines. It contains a high-quality synthetic oil that provides excellent lubrication and protects against carbon buildup.
Proper Storage: When storing the chainsaw for extended periods (e.g., during the off-season), drain the fuel tank completely. Alternatively, use a fuel stabilizer to prevent the fuel from degrading.
Spark Plug Maintenance: A fouled spark plug can throw off the M-Tronic™ system. Inspect and clean the spark plug regularly, and replace it as needed (typically every 100 hours of operation). Refer to the owner’s manual for the correct spark plug type and gap. I usually carry a spare spark plug with me when I’m working in the woods, just in case.
Air Filter Cleaning: A dirty air filter restricts airflow, causing the engine to run rich and reducing power. Clean the air filter regularly, especially when working in dusty conditions. I recommend using compressed air to blow out the filter from the inside out.

Data Point: Studies have shown that using premium fuel and maintaining a clean air filter can improve fuel efficiency by up to 15% in M-Tronic™ equipped chainsaws. This translates to significant cost savings and reduced emissions over the lifespan of the saw.

Pro Tip #2: Chain Selection and Sharpening: The Cutting Edge of Performance

The chain is the heart of any chainsaw, and selecting the right chain and keeping it sharp is paramount for efficient cutting and safe operation. I’ve seen firsthand how a dull chain can turn a simple task into a frustrating and dangerous ordeal.

Chain Types: Stihl offers a variety of chains designed for different applications. For general firewood cutting and felling, I recommend using a semi-chisel chain like the Stihl Rapid Micro™ (RM) or Rapid Super™ (RS). These chains offer a good balance of cutting speed and durability. For milling lumber, consider using a ripping chain, which is designed to cut along the grain of the wood.
Chain Pitch and Gauge: Ensure that the chain pitch and gauge match the specifications of your chainsaw. The pitch is the distance between three consecutive rivets, and the gauge is the thickness of the drive links. Using the wrong chain can damage the sprocket and bar.
Chain Sharpening: A sharp chain is essential for efficient cutting and preventing kickback. I recommend sharpening the chain after every few hours of use, or whenever you notice a decrease in cutting performance.
- Hand Sharpening: Use a chainsaw file and a filing guide to sharpen the chain manually. The filing guide helps maintain the correct filing angle and depth. Practice makes perfect, so don’t be discouraged if your first few attempts aren’t perfect.
- Electric Chain Sharpener: For faster and more precise sharpening, consider using an electric chain sharpener. These sharpeners use a grinding wheel to sharpen the chain quickly and accurately.
Depth Gauge Adjustment: The depth gauge controls the amount of wood the chain can cut with each pass. If the depth gauges are too high, the chain will cut slowly. If they are too low, the chain will be prone to kickback. Use a depth gauge tool to maintain the correct depth gauge setting.
Chain Tension: Proper chain tension is crucial for safe and efficient operation. The chain should be snug against the bar but still able to be pulled around the bar by hand. Check the chain tension frequently, especially when using a new chain, as it will stretch during the initial break-in period.

Case Study: In a recent study conducted by the Oregon State University Extension Service, it was found that sharpening a chainsaw chain regularly can reduce cutting time by up to 50% and extend the life of the chain by up to 30%. This underscores the importance of proper chain maintenance.

Pro Tip #3: Bar Maintenance and Lubrication: Extending the Life of Your Saw

The chainsaw bar is often overlooked, but it plays a critical role in guiding the chain and dissipating heat. Proper bar maintenance and lubrication are essential for extending the life of your chainsaw and preventing premature wear.

Bar Inspection: Regularly inspect the bar for wear and damage. Look for burrs, grooves, and uneven wear. Use a bar dresser to remove burrs and smooth out the edges of the bar.
Bar Rotation: Rotate the bar periodically to distribute wear evenly. This will help prevent the bar from wearing out prematurely. I usually rotate the bar every time I sharpen the chain.
Bar Cleaning: Keep the bar clean and free of debris. Use a wire brush to remove sawdust and pitch from the bar groove.
Lubrication: Use a high-quality bar and chain oil to lubricate the chain and bar. The oil reduces friction, dissipates heat, and prevents rust. Check the oil level frequently and refill as needed. I prefer using a biodegradable bar and chain oil to minimize environmental impact.
Oiler Adjustment: The MS 400 C-M features an adjustable oiler, allowing you to control the amount of oil delivered to the chain and bar. Adjust the oiler setting based on the type of wood you are cutting and the ambient temperature. Hardwoods require more oil than softwoods, and warmer temperatures may require a higher oiler setting.

Technical Requirement: The Stihl MS 400 C-M requires bar and chain oil that meets or exceeds the ISO VG 100 viscosity grade. Using the wrong type of oil can damage the oil pump and reduce the lifespan of the bar and chain.

Pro Tip #4: Safe Starting and Handling Techniques: Prioritizing Your Well-being

Chainsaws are powerful tools that can be dangerous if not handled properly. Safe starting and handling techniques are paramount for preventing accidents and injuries. I’ve witnessed too many close calls in the woods, and I can’t stress enough the importance of safety.

Personal Protective Equipment (PPE): Always wear appropriate PPE when operating a chainsaw, including:
- Chainsaw Chaps: These protect your legs from accidental contact with the chain.
- Safety Glasses or Face Shield: These protect your eyes from flying debris.
- Hearing Protection: Chainsaws are loud, and prolonged exposure to high noise levels can damage your hearing.
- Gloves: Gloves provide a better grip and protect your hands from cuts and abrasions.
- Steel-Toed Boots: These protect your feet from falling logs and accidental cuts.
- Helmet: A helmet protects your head from falling branches and other hazards.
Starting Procedures:
- Clear the Area: Ensure that the area around you is clear of obstacles and bystanders.
- Firm Footing: Find a stable and level surface to stand on.
- Engage the Chain Brake: Always engage the chain brake before starting the chainsaw.
- Starting on the Ground: Place the chainsaw on the ground with the bar and chain clear of any obstructions. Hold the front handle firmly with one hand and pull the starter cord with the other.
- Starting Between Your Legs: For larger chainsaws, you may need to start the saw between your legs. Place the rear handle between your thighs and hold the front handle firmly with one hand. Pull the starter cord with the other.
Cutting Techniques:
- Firm Grip: Maintain a firm grip on the chainsaw with both hands.
- Keep Your Balance: Keep your balance and avoid overreaching.
- Avoid Kickback: Kickback occurs when the tip of the bar contacts a solid object or is pinched in the cut. To avoid kickback, avoid using the tip of the bar and be aware of the potential for pinching.
- Plan Your Cuts: Plan your cuts carefully and avoid cutting above your shoulder height.
Emergency Stop: Know how to stop the chainsaw quickly in an emergency. The chain brake can be engaged by pushing the front hand guard forward.

Data Point: According to the U.S. Consumer Product Safety Commission, chainsaws cause approximately 30,000 injuries each year in the United States. Wearing appropriate PPE and following safe operating procedures can significantly reduce the risk of injury.

Pro Tip #5: Troubleshooting Common Issues: Resolving Problems Efficiently

Even with proper maintenance and care, chainsaws can sometimes experience problems. Knowing how to troubleshoot common issues can save you time and money.

Hard Starting:
- Check the Fuel: Ensure that the fuel tank is full and that the fuel is fresh.
- Check the Spark Plug: Inspect the spark plug for fouling or damage. Clean or replace the spark plug as needed.
- Check the Air Filter: Clean the air filter to ensure proper airflow.
- Check the Carburetor: The carburetor may need to be adjusted or cleaned. If you are not comfortable working on the carburetor, take the chainsaw to a qualified service technician.
Chain Not Oiling:
- Check the Oil Level: Ensure that the oil tank is full.
- Check the Oiler Adjustment: Adjust the oiler setting to increase the amount of oil delivered to the chain and bar.
- Check the Oil Filter: The oil filter may be clogged. Clean or replace the oil filter as needed.
- Check the Oil Pump: The oil pump may be damaged or malfunctioning. If the oil pump is not working, take the chainsaw to a qualified service technician.
Chain Binding:
- Check the Chain Tension: Ensure that the chain tension is correct.
- Check the Bar for Damage: Inspect the bar for burrs or grooves that may be causing the chain to bind.
- Check the Wood for Obstructions: Ensure that there are no nails, screws, or other obstructions in the wood.
Engine Stalling:
- Check the Fuel: Ensure that the fuel tank is full and that the fuel is fresh.
- Check the Air Filter: Clean the air filter to ensure proper airflow.
- Check the Spark Plug: Inspect the spark plug for fouling or damage. Clean or replace the spark plug as needed.
- Check the Carburetor: The carburetor may need to be adjusted or cleaned. If you are not comfortable working on the carburetor, take the chainsaw to a qualified service technician.

Troubleshooting Guidance: When troubleshooting chainsaw problems, always refer to the owner’s manual for specific instructions and recommendations. If you are not comfortable working on the chainsaw yourself, take it to a qualified service technician.

Beyond the Chainsaw: Mastering the Art of Wood Processing

Owning a Stihl MS 400 C-M chainsaw is just the beginning. To truly master the art of wood processing, you need to understand the entire process, from felling trees to seasoning firewood.

Felling Trees Safely and Efficiently

Felling trees is a dangerous task that requires careful planning and execution. Here’s a step-by-step guide:

Assess the Tree: Evaluate the tree’s size, lean, and condition. Look for signs of decay, disease, or broken branches.
Plan the Felling Direction: Determine the direction in which you want the tree to fall. Consider the tree’s natural lean, wind direction, and obstacles in the area.
Clear the Area: Clear the area around the tree of any obstacles, such as brush, rocks, or debris. Create a clear escape path that is at a 45-degree angle to the planned felling direction.
Make the Notch: Cut a notch on the side of the tree facing the planned felling direction. The notch should be about one-third of the tree’s diameter and have a 45-degree angle.
Make the Felling Cut: Cut from the opposite side of the tree, slightly above the notch. Leave a hinge of wood between the felling cut and the notch.
Wedge the Tree: If the tree does not begin to fall on its own, use a felling wedge to help push it over.
Retreat Safely: As the tree begins to fall, retreat quickly along your escape path.

De-limbing and Bucking

Once the tree is on the ground, it needs to be de-limbed and bucked into manageable lengths.

De-limbing: Remove the branches from the tree using a chainsaw or axe. Be careful to avoid kickback when cutting branches.
Bucking: Cut the tree into logs of the desired length. Use a measuring stick to ensure consistent lengths.

Splitting Firewood

Splitting firewood is a necessary step for preparing it for burning.

Manual Splitting: Use a splitting axe or maul to split the logs by hand. Choose a splitting block that is stable and at a comfortable height.
Hydraulic Log Splitter: For larger volumes of firewood, consider using a hydraulic log splitter. These machines can split logs quickly and easily.

Seasoning Firewood

Green wood contains a high moisture content, which makes it difficult to burn and produces excessive smoke. Seasoning firewood reduces the moisture content, making it burn more efficiently.

Stacking: Stack the firewood in a single row, allowing for good air circulation.
Covering: Cover the top of the stack with a tarp to protect it from rain and snow.
Drying Time: Allow the firewood to dry for at least six months, or preferably a year. The ideal moisture content for firewood is below 20%.

Data Point: Studies have shown that properly seasoned firewood can produce up to 25% more heat than green wood and significantly reduce emissions.

Costs, Budgeting, and Resource Management

Wood processing can be a cost-effective way to heat your home, but it’s important to consider the costs involved.

Equipment Costs: Chainsaws, axes, log splitters, and other tools can be expensive. Consider renting equipment if you only need it occasionally.
Fuel and Oil Costs: Chainsaws require fuel and oil, which can add up over time.
Maintenance Costs: Chainsaws require regular maintenance, such as chain sharpening and spark plug replacement.
Time Costs: Wood processing takes time and effort. Consider your time commitment when deciding whether to process your own firewood.

Budgeting Considerations: Create a budget to track your expenses and ensure that you are not overspending. Look for ways to save money, such as buying used equipment or sourcing firewood from free or low-cost sources.

Practice Safe Operating Procedures: Always prioritize safety when operating a chainsaw or other wood processing equipment.
Start Small: Begin with small projects and gradually increase the scale of your operations as you gain experience.
Seek Expert Advice: Don’t hesitate to seek advice from experienced loggers or arborists.
Join a Woodworking Community: Connect with other woodworking enthusiasts to share tips, ideas, and resources.

Additional Resources:

Stihl Website: https://www.stihl.com/
Oregon State University Extension Service: https://extension.oregonstate.edu/
Local Logging and Arborist Associations: These organizations can provide valuable resources and training opportunities.

By following these pro tips and guidelines, you can unlock the full potential of your Stihl MS 400 C-M chainsaw and become a skilled wood processor. Remember, safety is always the top priority, so take your time, be careful, and enjoy the satisfaction of working with wood.