Stihl MS660 Specs (5 Pro Tips for Safer Cuts)

Let’s dive into the heart of wood processing and firewood preparation, focusing on a legend in the chainsaw world: the Stihl MS660. I’ve spent countless hours in the woods, and I’ve learned that having the right tool, along with the knowledge to use it safely, can make all the difference. The MS660 is a beast, no doubt, but with great power comes great responsibility. I’m going to share my insights on its specifications and, more importantly, provide five pro tips to ensure safer cuts.

Stihl MS660 Specs and Pro Tips for Safer Cuts

Introduction: The Evolution of Chainsaw Technology

The chainsaw has revolutionized forestry and wood processing. From the early cumbersome models to today’s high-performance machines, the evolution has been remarkable. The Stihl MS660 represents a pinnacle of power and engineering in its class. It’s designed for demanding tasks, and while newer models boast advanced features, the MS660 remains a favorite among professionals for its raw strength and reliability. I remember when I first laid my hands on an MS660. It was like holding a piece of history, a tool that could fell giants. But I quickly learned that respect and knowledge are paramount when wielding such power.

Understanding the Stihl MS660: A Deep Dive into its Specifications

Before we get into the safety tips, let’s take a look at what makes the Stihl MS660 so special. Knowing the specifications will help you understand its capabilities and limitations.

• Engine: 91.6 cc (5.6 cu. in.)
• Power Output: 5.2 kW (7.1 bhp)
• Weight: 7.3 kg (16.1 lbs) without bar and chain
• Fuel Capacity: 0.825 L (27.9 oz)
• Oil Capacity: 0.36 L (12.2 oz)
• Guide Bar Lengths (Recommended): 20″ to 36″ (50 cm to 90 cm)
• Chain Pitch: .404″
• Chain Gauge: .063″

These specs tell a story. The large engine displacement and high power output indicate its ability to handle large diameter trees and hardwoods. The weight, however, is a factor to consider, especially for prolonged use. The recommended bar lengths are crucial; using too long a bar can strain the engine and reduce cutting efficiency.

Takeaway: Familiarize yourself with these specifications. They’re not just numbers; they define the machine’s capabilities and limitations. Choosing the right bar length and understanding the power-to-weight ratio are critical for safe and efficient operation.

Pro Tip #1: Mastering the Pre-Cut Inspection

Before starting any chainsaw, a thorough inspection is crucial. This isn’t just a cursory glance; it’s a detailed examination of every component.

• Chain Sharpness: A dull chain is a dangerous chain. It requires more force, increases the risk of kickback, and produces more vibration. I always sharpen my chain before each use. A sharp chain bites into the wood effortlessly.
• Chain Tension: Proper chain tension is essential for smooth cutting and preventing derailment. The chain should be snug against the bar but still able to be pulled around by hand. I typically check this after the first few cuts as the chain warms up and expands.
• Bar Condition: Check for wear, damage, or burrs on the bar. A damaged bar can cause the chain to bind or derail. I use a bar dressing tool to remove any burrs and ensure a smooth surface.
• Fuel and Oil Levels: Never start a chainsaw without adequate fuel and bar oil. Running out of bar oil can quickly ruin the bar and chain. I always fill both tanks before starting, even if they appear to have some fluid remaining.
• Safety Features: Test the chain brake to ensure it engages properly. Check the throttle lock and on/off switch. These safety features are your last line of defense in case of an emergency. I make it a habit to test the chain brake before every cutting session.
• Air Filter: A clean air filter ensures optimal engine performance. A clogged filter can reduce power and increase fuel consumption. I clean the air filter regularly, especially when working in dusty conditions.

My Personal Experience: I once skipped a pre-cut inspection and paid the price. The chain was dull, and I forced it through the wood. The saw kicked back violently, narrowly missing my leg. That was a wake-up call. Now, I never skip the pre-cut inspection, no matter how eager I am to start cutting.

Data Point: According to a study by the National Institute for Occupational Safety and Health (NIOSH), a significant percentage of chainsaw injuries are due to improper maintenance.

Actionable Metric: Aim to spend at least 5 minutes on the pre-cut inspection. This small investment of time can prevent serious injuries.

Takeaway: The pre-cut inspection is not a formality; it’s a critical safety procedure. A well-maintained chainsaw is a safer chainsaw.

Pro Tip #2: Mastering the Stance and Grip

Your stance and grip are your foundation for safe and controlled cutting. A solid stance provides stability, while a proper grip allows you to control the chainsaw and react quickly to unexpected movements.

• Stance: Stand with your feet shoulder-width apart, with one foot slightly ahead of the other. This provides a stable base and allows you to shift your weight as needed. I prefer a staggered stance, with my left foot slightly forward when bucking logs.
• Grip: Use a firm, two-handed grip on the chainsaw. Your thumbs should be wrapped around the handles. This provides maximum control and reduces the risk of losing your grip. I always wear gloves for added grip and protection.
• Body Position: Keep your body to the side of the chainsaw, not directly behind it. This reduces the risk of injury if the saw kicks back. I try to position myself so that the chainsaw is never in line with my torso.
• Arm Position: Keep your arms slightly bent to absorb vibration and reduce fatigue. Straight arms can transmit more vibration to your body, leading to discomfort and potential injury. I find that slightly bent arms also allow for better control.
• Avoid Overreaching: Don’t overreach or extend your arms too far. This reduces your control and increases the risk of losing your balance. I always reposition myself to maintain a comfortable and controlled reach.

My Personal Experience: I used to underestimate the importance of stance and grip. I would often reach too far or stand in an awkward position. This led to fatigue, reduced control, and near misses. Once I focused on perfecting my stance and grip, my cutting became smoother, safer, and more efficient.

Data Point: Research from forestry safety organizations shows that proper stance and grip can reduce the risk of chainsaw kickback by up to 50%.

Actionable Metric: Practice your stance and grip until it becomes second nature. Spend a few minutes before each cutting session practicing your technique.

Takeaway: Your stance and grip are your connection to the chainsaw. A solid foundation and a firm grip are essential for safe and controlled cutting.

Pro Tip #3: Understanding and Avoiding Kickback

Kickback is one of the most dangerous hazards associated with chainsaw use. It occurs when the upper tip of the guide bar contacts an object, causing the saw to suddenly and violently kick back towards the operator.

• The Kickback Zone: Be aware of the kickback zone, which is the upper quadrant of the guide bar tip. Avoid contacting this area with the wood. I always visualize the kickback zone before making a cut.
• Boring Cuts: Be extremely cautious when making boring cuts (plunging the tip of the bar into the wood). These cuts are particularly prone to kickback. I only use boring cuts when absolutely necessary and with extreme caution.
• Maintain a Solid Grip: A firm grip is essential for controlling the chainsaw and reacting to kickback. I always ensure that my thumbs are wrapped around the handles.
• Use Low-Kickback Chains: Low-kickback chains have guard links that reduce the risk of kickback. I recommend using low-kickback chains, especially for beginners.
• Keep the Chain Sharp: A dull chain increases the risk of kickback. A sharp chain bites into the wood more easily, reducing the likelihood of the bar tip catching.
• Anti-Kickback Features: Utilize the chainsaw’s anti-kickback features, such as the chain brake. Ensure that the chain brake is functioning properly before each use.

My Personal Experience: I’ve experienced kickback firsthand, and it’s a terrifying experience. The saw kicked back so violently that it ripped out of my hands. Luckily, the chain brake engaged, preventing serious injury. That experience taught me to respect the power of kickback and to take every precaution to avoid it.

Data Point: Statistics from the Consumer Product Safety Commission (CPSC) indicate that kickback is a leading cause of chainsaw injuries.

Actionable Metric: Spend time practicing kickback prevention techniques. Familiarize yourself with the kickback zone and practice avoiding it.

Takeaway: Understanding and avoiding kickback is crucial for chainsaw safety. Be aware of the kickback zone, maintain a solid grip, and use low-kickback chains.

Pro Tip #4: Mastering Felling Techniques

Felling a tree is a complex and potentially dangerous task. Proper planning and technique are essential for ensuring a safe and controlled fall.

• Assess the Tree: Before felling a tree, carefully assess its size, lean, and any defects. Look for dead limbs, cracks, or other signs of weakness. I always take my time to thoroughly assess the tree before making any cuts.
• Plan the Escape Route: Before making any cuts, plan your escape route. This should be a clear path away from the tree at a 45-degree angle to the direction of the fall. I clear the escape route of any obstacles before starting the cut.
• The Notch Cut: The notch cut determines the direction of the fall. It should be cut on the side of the tree that you want it to fall towards. I use a combination of an open-face notch and a conventional notch, depending on the tree’s lean and size.
• The Back Cut: The back cut is made on the opposite side of the tree from the notch cut. It should be made slightly higher than the notch cut, leaving a hinge of wood to control the fall. I never cut completely through the tree; I always leave a hinge.
• Use Wedges: Use felling wedges to help direct the fall of the tree. Wedges can be inserted into the back cut to lift the tree and push it in the desired direction. I always carry wedges with me when felling trees.
• Communicate: If you’re working with a team, communicate clearly and consistently. Use hand signals and verbal commands to coordinate your actions. I always establish clear communication protocols before starting any felling operation.

My Personal Experience: I once felled a tree without properly assessing its lean. The tree fell in the wrong direction, narrowly missing a power line. That was a close call that taught me the importance of careful planning and assessment.

Data Point: Studies by forestry safety organizations show that improper felling techniques are a major cause of logging accidents.

Actionable Metric: Take a felling course or workshop to learn proper techniques. Practice felling techniques on small trees before attempting to fell larger trees.

Takeaway: Felling a tree is a complex task that requires careful planning and execution. Assess the tree, plan your escape route, and use proper cutting techniques.

Pro Tip #5: Maintaining Your MS660 for Longevity and Safety

Proper maintenance is essential for ensuring the longevity and safety of your Stihl MS660. A well-maintained chainsaw will perform better, last longer, and be less likely to cause accidents.

• Regular Cleaning: Clean your chainsaw regularly to remove sawdust, sap, and debris. Pay particular attention to the air filter, cylinder fins, and chain brake mechanism. I clean my chainsaw after every use.
• Sharpening the Chain: Keep your chain sharp. A dull chain is not only inefficient but also dangerous. I sharpen my chain before each use and whenever it starts to feel dull.
• Bar Maintenance: Clean and lubricate the guide bar regularly. Check for wear and damage and replace the bar if necessary. I use a bar dressing tool to remove any burrs and ensure a smooth surface.
• Air Filter Maintenance: Clean or replace the air filter regularly. A clogged air filter can reduce engine performance and increase fuel consumption. I clean the air filter every few hours when working in dusty conditions.
• Spark Plug Maintenance: Check and clean the spark plug regularly. A fouled spark plug can cause starting problems and reduced engine performance. I replace the spark plug annually.
• Fuel and Oil: Use high-quality fuel and bar oil. Avoid using old or contaminated fuel. I always use Stihl-approved fuel and bar oil in my MS660.
• Professional Service: Have your chainsaw serviced by a qualified technician at least once a year. A professional service can identify and correct potential problems before they become serious. I take my MS660 to a Stihl dealer for a tune-up every year.

My Personal Experience: I neglected to maintain my chainsaw properly, and it eventually broke down in the middle of a job. The repair was expensive, and I was without my chainsaw for several days. That experience taught me the importance of regular maintenance.

Data Point: Studies show that regular maintenance can extend the life of a chainsaw by up to 50%.

Actionable Metric: Create a maintenance schedule for your chainsaw and stick to it. Track your maintenance activities and keep a record of any repairs.

Takeaway: Proper maintenance is essential for ensuring the longevity and safety of your Stihl MS660. Clean your chainsaw regularly, sharpen the chain, and have it serviced by a qualified technician.

Additional Safety Considerations

Beyond the five pro tips, here are a few additional safety considerations to keep in mind:

• Personal Protective Equipment (PPE): Always wear appropriate PPE, including a helmet, eye protection, hearing protection, gloves, chainsaw chaps, and steel-toed boots. PPE is your first line of defense against injury.
• First Aid Kit: Keep a well-stocked first aid kit on hand. Know how to treat common chainsaw injuries, such as cuts and abrasions.
• Emergency Communication: Carry a cell phone or two-way radio in case of an emergency. Know the location of the nearest medical facility.
• Avoid Working Alone: Whenever possible, avoid working alone. Having a partner can provide assistance in case of an emergency.
• Stay Hydrated: Drink plenty of water to stay hydrated, especially when working in hot weather. Dehydration can lead to fatigue and reduced concentration.
• Take Breaks: Take frequent breaks to avoid fatigue. Fatigue can impair your judgment and increase the risk of accidents.
• Avoid Drugs and Alcohol: Never operate a chainsaw under the influence of drugs or alcohol.

My Personal Experience: I once witnessed a logging accident where a worker was seriously injured. The worker was not wearing proper PPE and was working alone. That incident reinforced the importance of following all safety precautions.

Data Point: Statistics show that the majority of chainsaw accidents occur when workers are not wearing proper PPE or are not following safety procedures.

Actionable Metric: Review your safety practices regularly and make any necessary improvements. Attend safety training courses to stay up-to-date on the latest safety procedures.

Takeaway: Safety is paramount when operating a chainsaw. Always wear appropriate PPE, carry a first aid kit, and avoid working alone.

Understanding Wood Types and Their Impact on Cutting

The type of wood you’re cutting significantly impacts the cutting process and the wear and tear on your chainsaw. Different wood types have varying densities, hardness, and moisture content, all of which affect cutting efficiency and safety.

• Hardwoods vs. Softwoods: Hardwoods (e.g., oak, maple, hickory) are denser and harder than softwoods (e.g., pine, fir, cedar). Hardwoods require more power to cut and can dull your chain more quickly. Softwoods, on the other hand, are easier to cut but can be more prone to splintering.
• Moisture Content: Green wood (freshly cut) has a high moisture content, making it heavier and more difficult to cut. Dry wood is lighter and easier to cut but can also be more brittle. I prefer to cut firewood when it’s partially seasoned, as it’s easier to handle than green wood and less likely to splinter than fully dry wood.
• Grain Direction: The direction of the wood grain also affects cutting. Cutting with the grain is generally easier than cutting against the grain. Be aware of the grain direction when felling trees or bucking logs.
• Knots: Knots are areas where branches grew out of the tree. They are denser and harder than the surrounding wood and can be difficult to cut through. Be careful when cutting near knots, as they can cause the chainsaw to bind or kick back.

My Personal Experience: I once tried to cut through a large oak log with a dull chain. The chainsaw bogged down, and the chain started smoking. I quickly realized that I needed to sharpen the chain and adjust my cutting technique to handle the dense hardwood.

Data Point: Studies show that cutting hardwoods can reduce the lifespan of a chainsaw chain by up to 30%.

Actionable Metric: Learn to identify different wood types and adjust your cutting technique accordingly. Use a moisture meter to measure the moisture content of the wood before cutting.

Takeaway: Understanding wood types and their properties is essential for efficient and safe cutting. Adjust your cutting technique and chain sharpness based on the type of wood you’re cutting.

Advanced Cutting Techniques for the MS660

Once you’ve mastered the basic cutting techniques, you can explore more advanced techniques to improve your efficiency and safety.

• Hinge Cutting: Hinge cutting is a technique used in forestry to create habitat for wildlife. It involves partially cutting trees and bending them over to create a living hinge. This creates a dense thicket of vegetation that provides cover and food for wildlife.
• Precision Felling: Precision felling involves felling trees in a specific direction to minimize damage to surrounding vegetation or structures. This requires careful planning and precise cutting techniques.
• Bucking Techniques: Bucking is the process of cutting logs into shorter lengths. There are several different bucking techniques, each suited for different situations. Some common techniques include the single buck, the double buck, and the step buck.
• Limbing Techniques: Limbing is the process of removing branches from a felled tree. This can be a dangerous task, as the branches can be under tension and can spring back when cut. Use caution when limbing and always wear appropriate PPE.

My Personal Experience: I’ve used hinge cutting techniques to create habitat for deer and other wildlife on my property. It’s a rewarding experience to see the positive impact of your work on the environment.

Data Point: Studies have shown that hinge cutting can significantly increase the diversity and abundance of wildlife in forested areas.

Actionable Metric: Take an advanced chainsaw course to learn these techniques. Practice these techniques on small trees before attempting them on larger trees.

Takeaway: Mastering advanced cutting techniques can improve your efficiency, safety, and ability to manage forests and create wildlife habitat.

Troubleshooting Common MS660 Issues

Even with proper maintenance, your Stihl MS660 may experience occasional problems. Here are some common issues and how to troubleshoot them:

• Starting Problems: Starting problems can be caused by a variety of factors, including a fouled spark plug, a clogged air filter, or old fuel. Check the spark plug, air filter, and fuel before attempting to start the chainsaw.
• Engine Stalling: Engine stalling can be caused by a lean fuel mixture, a clogged fuel filter, or a faulty carburetor. Check the fuel filter and carburetor before taking the chainsaw to a mechanic.
• Chain Binding: Chain binding can be caused by a dull chain, a damaged bar, or improper chain tension. Sharpen the chain, check the bar for damage, and adjust the chain tension.
• Excessive Vibration: Excessive vibration can be caused by a loose chain, a damaged bar, or worn engine mounts. Check the chain tension, bar, and engine mounts.
• Overheating: Overheating can be caused by a clogged air filter, a lean fuel mixture, or a faulty cooling system. Check the air filter, fuel mixture, and cooling system.

My Personal Experience: I once had a starting problem with my MS660. I tried everything I could think of, but nothing worked. Finally, I took it to a mechanic, who discovered that the fuel line was cracked. Replacing the fuel line solved the problem.

Data Point: Statistics show that many chainsaw problems can be prevented with regular maintenance.

Actionable Metric: Consult your Stihl MS660 owner’s manual for detailed troubleshooting information. Keep a record of any problems you experience and how you resolved them.

Takeaway: Knowing how to troubleshoot common MS660 issues can save you time and money. Consult your owner’s manual and seek professional assistance when needed.

The Future of Chainsaw Technology

Chainsaw technology continues to evolve, with new innovations constantly being introduced. Some of the trends shaping the future of chainsaw technology include:

• Battery-Powered Chainsaws: Battery-powered chainsaws are becoming increasingly popular, offering quieter operation, reduced emissions, and easier maintenance. While they may not yet match the power of gas-powered chainsaws like the MS660, they are rapidly improving.
• Electronic Fuel Injection: Electronic fuel injection (EFI) systems provide more precise fuel delivery, resulting in improved engine performance and fuel efficiency.
• Automatic Chain Tensioning: Automatic chain tensioning systems automatically adjust the chain tension, eliminating the need for manual adjustments.
• Smart Chainsaws: Smart chainsaws incorporate sensors and electronics to monitor engine performance, provide safety alerts, and even assist with cutting tasks.

My Personal Experience: I’ve tried out some of the newer battery-powered chainsaws, and I’ve been impressed with their performance. While I still prefer my MS660 for heavy-duty tasks, I can see the potential for battery-powered chainsaws to become the dominant technology in the future.

Data Point: Market research indicates that the demand for battery-powered chainsaws is growing rapidly.

Actionable Metric: Stay informed about the latest chainsaw technology and consider upgrading to a newer model when it makes sense for your needs.

Takeaway: Chainsaw technology is constantly evolving. Stay informed about the latest innovations and consider how they can improve your efficiency and safety.

Conclusion: Respecting the Power of the MS660

The Stihl MS660 is a powerful and capable chainsaw, but it demands respect. By understanding its specifications, mastering proper techniques, and following safety precautions, you can harness its power safely and efficiently. Remember, the key to safe chainsaw operation is knowledge, skill, and a healthy dose of caution. I hope these pro tips have been helpful, and I encourage you to continue learning and practicing to become a skilled and safe chainsaw operator. The woods are a rewarding place to work, but they require vigilance and respect. Stay safe out there!

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