Stihl MS 660 Magnum Chainsaws (5 Pro Features)

Innovation is the lifeblood of any industry, and the world of logging and wood processing is no exception. Over the years, I’ve witnessed firsthand how advancements in chainsaw technology have revolutionized the way we fell trees, process timber, and prepare firewood. One chainsaw, in particular, stands out as a true icon in this realm: the Stihl MS 660 Magnum.

The Stihl MS 660 Magnum isn’t just a chainsaw; it’s a legacy. For years, it’s been the go-to tool for professionals tackling the toughest jobs in the harshest environments. Its reputation for power, reliability, and durability is legendary. But what exactly makes this chainsaw so special? What are the features that have cemented its place as a top choice for loggers and woodcutters worldwide?

The Stihl MS 660 Magnum: A Legacy of Power and Performance

Before we dive into the specific features, let’s take a moment to appreciate the overall design and engineering of the Stihl MS 660 Magnum. This chainsaw is built for one purpose: to deliver maximum power and performance in the most demanding conditions. From its high-displacement engine to its robust construction, every aspect of the MS 660 Magnum is designed to withstand the rigors of professional use.

I remember one particularly challenging job where I was tasked with felling a stand of old-growth oak trees. These trees were massive, with trunks that measured several feet in diameter. My usual chainsaw struggled to handle the workload, but the MS 660 Magnum made quick work of even the largest trees. Its raw power and unwavering reliability allowed me to complete the job efficiently and safely.

Feature 1: High-Displacement Engine for Unmatched Power

The heart of the Stihl MS 660 Magnum is its high-displacement engine. This engine is designed to deliver maximum power and torque, allowing the chainsaw to cut through even the toughest wood with ease. The MS 660 Magnum boasts a 91.6 cc engine, which generates a whopping 7.1 horsepower. This level of power is unmatched by most other chainsaws in its class.

The high-displacement engine also contributes to the chainsaw’s exceptional durability. Because the engine isn’t constantly straining to deliver power, it experiences less wear and tear over time. This means that the MS 660 Magnum is built to last, even under heavy use.

Here’s a breakdown of the key specifications of the MS 660 Magnum engine:

Engine Displacement: 91.6 cc
Power Output: 7.1 bhp (5.3 kW)
Engine Type: 2-stroke
Cylinder: Single
Bore: 54 mm
Stroke: 40 mm
Ignition System: Electronic
Fuel Tank Capacity: 0.825 L (27.9 oz)

Understanding Engine Displacement and Power

Engine displacement refers to the total volume of the cylinders in an engine. A larger displacement generally means more power, as the engine can take in and burn more fuel and air with each stroke. In the case of the MS 660 Magnum, the large displacement engine is the key to its impressive power output.

Horsepower (bhp) is a measure of the rate at which an engine can do work. The higher the horsepower, the more powerful the engine. The MS 660 Magnum’s 7.1 horsepower rating is a testament to its ability to handle demanding cutting tasks.

Practical Tips for Maximizing Engine Performance

To get the most out of your MS 660 Magnum engine, follow these tips:

Use High-Quality Fuel: Always use a premium-grade fuel with the correct octane rating. This will help ensure optimal engine performance and prevent premature wear.
Mix Fuel Properly: Use a high-quality two-stroke oil and mix it with fuel according to the manufacturer’s recommendations. Improper mixing can lead to engine damage.
Maintain Air Filter: Keep the air filter clean to ensure proper airflow to the engine. A dirty air filter can reduce power and increase fuel consumption.
Regularly Inspect Spark Plug: Check the spark plug regularly and replace it as needed. A worn or fouled spark plug can cause starting problems and reduce engine performance.
Tune the Carburetor: If you notice that the engine is running rough or not performing as expected, have the carburetor tuned by a qualified technician.

Feature 2: Heavy-Duty Construction for Unwavering Reliability

The Stihl MS 660 Magnum is built to withstand the rigors of professional use. Its heavy-duty construction ensures that it can handle even the most demanding tasks without failing. From its forged crankshaft to its magnesium crankcase, every component of the MS 660 Magnum is designed for maximum durability.

I’ve seen firsthand how the MS 660 Magnum can hold up under extreme conditions. I once used it to fell trees in a remote area where the temperature was well below freezing. Despite the harsh conditions, the chainsaw performed flawlessly, without any signs of hesitation or failure.

Key Components of the Heavy-Duty Construction

Forged Crankshaft: The forged crankshaft is designed to withstand the high stresses and strains of heavy use. It’s stronger and more durable than a cast crankshaft.
Magnesium Crankcase: The magnesium crankcase provides a lightweight yet strong housing for the engine components. It helps to dissipate heat and prevent damage from vibration.
High-Quality Bearings: The MS 660 Magnum uses high-quality bearings throughout the engine and transmission. These bearings are designed to withstand heavy loads and provide smooth, reliable operation.
Durable Cylinder and Piston: The cylinder and piston are made from high-quality materials that are designed to resist wear and tear. This helps to ensure long engine life.
Reinforced Clutch: The clutch is reinforced to handle the high torque output of the engine. This prevents slippage and ensures that the power is transferred efficiently to the chain.

Maintaining the Heavy-Duty Construction

To keep your MS 660 Magnum in top condition, follow these maintenance tips:

Regular Cleaning: Clean the chainsaw regularly to remove dirt, debris, and sawdust. This will help prevent corrosion and ensure that all components are functioning properly.
Proper Lubrication: Lubricate the chain and bar regularly to reduce friction and wear. Use a high-quality bar and chain oil.
Tighten Fasteners: Check all fasteners regularly and tighten them as needed. Loose fasteners can cause vibration and damage to the chainsaw.
Inspect Rubber Components: Inspect rubber components, such as hoses and vibration dampers, for cracks and wear. Replace them as needed.
Store Properly: Store the chainsaw in a dry, protected location when not in use. This will help prevent corrosion and damage from the elements.

Feature 3: Anti-Vibration System for Reduced Fatigue

Prolonged use of a chainsaw can lead to fatigue and discomfort, especially when dealing with a powerful machine like the MS 660 Magnum. That’s why Stihl equipped this chainsaw with an advanced anti-vibration system. This system isolates the engine and cutting components from the handles, reducing the amount of vibration that is transmitted to the operator.

I’ve experienced the benefits of this anti-vibration system firsthand. On long days of cutting, I’ve noticed a significant reduction in fatigue and discomfort compared to using chainsaws without this feature. This allows me to work more efficiently and safely.

How the Anti-Vibration System Works

The anti-vibration system on the MS 660 Magnum consists of a series of rubber buffers and steel springs that are strategically placed between the engine and the handles. These components absorb and dampen the vibrations produced by the engine and cutting chain, preventing them from being transmitted to the operator’s hands and arms.

Benefits of the Anti-Vibration System

Reduced Fatigue: The anti-vibration system reduces fatigue, allowing you to work longer and more comfortably.
Increased Comfort: The reduced vibration makes the chainsaw more comfortable to use, especially on long jobs.
Improved Control: The reduced vibration improves control over the chainsaw, making it easier to make accurate cuts.
Reduced Risk of Injury: The anti-vibration system reduces the risk of developing vibration-related injuries, such as carpal tunnel syndrome.

Maintaining the Anti-Vibration System

To keep the anti-vibration system in top condition, follow these tips:

Inspect Rubber Buffers: Regularly inspect the rubber buffers for cracks and wear. Replace them as needed.
Check Steel Springs: Check the steel springs for damage or deformation. Replace them as needed.
Tighten Fasteners: Ensure that all fasteners that secure the anti-vibration system are tight. Loose fasteners can reduce the effectiveness of the system.
Clean Regularly: Clean the anti-vibration system regularly to remove dirt and debris. This will help prevent corrosion and ensure that all components are functioning properly.

Feature 4: Adjustable Oiler for Optimal Chain Lubrication

Proper chain lubrication is essential for the performance and longevity of any chainsaw. The Stihl MS 660 Magnum features an adjustable oiler that allows you to control the amount of oil that is delivered to the chain. This ensures that the chain is always properly lubricated, regardless of the type of wood you are cutting or the conditions you are working in.

I’ve found the adjustable oiler to be a valuable feature, especially when cutting hardwoods. Hardwoods require more lubrication than softwoods, and the adjustable oiler allows me to increase the oil flow to ensure that the chain is properly lubricated.

How the Adjustable Oiler Works

The adjustable oiler on the MS 660 Magnum consists of a small screw that is located near the oil pump. By turning this screw, you can adjust the amount of oil that is delivered to the chain. Turning the screw clockwise increases the oil flow, while turning it counterclockwise decreases the oil flow.

Benefits of the Adjustable Oiler

Optimal Chain Lubrication: The adjustable oiler allows you to customize the oil flow to ensure that the chain is always properly lubricated.
Reduced Chain Wear: Proper chain lubrication reduces friction and wear, extending the life of the chain.
Improved Cutting Performance: A properly lubricated chain cuts more efficiently, reducing the amount of effort required to operate the chainsaw.
Prevention of Bar Damage: Proper chain lubrication prevents the bar from overheating and warping.

Tips for Using the Adjustable Oiler

Start with a Low Setting: When using the chainsaw for the first time, start with a low oil flow setting and gradually increase it until the chain is properly lubricated.
Adjust for Wood Type: Increase the oil flow when cutting hardwoods and decrease it when cutting softwoods.
Adjust for Conditions: Increase the oil flow when working in hot or dry conditions and decrease it when working in cold or wet conditions.
Check Chain Regularly: Check the chain regularly to ensure that it is properly lubricated. If the chain appears dry or is smoking, increase the oil flow.
Use High-Quality Oil: Always use a high-quality bar and chain oil. This will help to ensure optimal lubrication and prevent premature wear.

Understanding Bar and Chain Oil Viscosity

The viscosity of bar and chain oil is a crucial factor in ensuring proper lubrication. Viscosity refers to the oil’s resistance to flow. Higher viscosity oils are thicker and flow more slowly, while lower viscosity oils are thinner and flow more easily.

For the MS 660 Magnum, I recommend using a bar and chain oil with a viscosity grade of ISO VG 100 or SAE 30. This viscosity grade provides a good balance between lubrication and flow, ensuring that the chain is properly lubricated without excessive oil consumption.

In colder climates, you may want to consider using a lower viscosity oil, such as ISO VG 68 or SAE 20. This will help the oil flow more easily in cold temperatures and prevent the oil pump from becoming clogged.

Feature 5: Side-Access Chain Tensioner for Easy Adjustments

Maintaining proper chain tension is essential for safe and efficient chainsaw operation. The Stihl MS 660 Magnum features a side-access chain tensioner that makes it easy to adjust the chain tension without having to remove the chain cover. This is a convenient feature that saves time and effort.

I’ve found the side-access chain tensioner to be particularly useful when working in the field. It allows me to quickly and easily adjust the chain tension without having to carry extra tools.

How the Side-Access Chain Tensioner Works

The side-access chain tensioner on the MS 660 Magnum consists of a small screw that is located on the side of the chain cover. By turning this screw, you can adjust the position of the bar, which in turn adjusts the chain tension. Turning the screw clockwise tightens the chain, while turning it counterclockwise loosens the chain.

Benefits of the Side-Access Chain Tensioner

Easy Chain Adjustment: The side-access chain tensioner makes it easy to adjust the chain tension without having to remove the chain cover.
Time-Saving: The side-access chain tensioner saves time and effort, especially when working in the field.
Convenient: The side-access chain tensioner is a convenient feature that makes chainsaw maintenance easier.
Accurate Adjustment: The side-access chain tensioner allows for precise chain tension adjustment.

Tips for Using the Side-Access Chain Tensioner

Loosen Chain Cover: Before adjusting the chain tension, loosen the chain cover screws slightly. This will allow the bar to move freely.
Tighten Chain: Turn the tensioning screw clockwise to tighten the chain. The chain should be snug against the bar but still able to be pulled around by hand.
Tighten Chain Cover: Once the chain is properly tensioned, tighten the chain cover screws securely.
Check Chain Tension Regularly: Check the chain tension regularly and adjust it as needed. The chain will stretch over time, so it is important to keep it properly tensioned.

Proper Chain Tension: A Balancing Act

Achieving proper chain tension is a balancing act. A chain that is too loose can derail from the bar, posing a safety hazard. A chain that is too tight can cause excessive wear on the bar, chain, and sprocket.

The ideal chain tension is one where the chain is snug against the bar but can still be pulled around by hand. You should be able to pull the chain away from the bar by about 1/8 inch (3 mm).

When adjusting chain tension, it’s important to remember that the chain will expand as it heats up during use. Therefore, it’s best to adjust the chain tension when the chain is cold. If you adjust the chain tension when the chain is hot, it may become too tight as it cools down.

Beyond the Features: Maximizing the MS 660 Magnum’s Potential

While the five pro features I’ve discussed are undoubtedly important, there are other factors that can affect the performance and longevity of your Stihl MS 660 Magnum. These include proper maintenance, using the right accessories, and employing safe operating practices.

Maintenance Matters

Regular maintenance is crucial for keeping your MS 660 Magnum in top condition. This includes:

Cleaning: Clean the chainsaw regularly to remove dirt, debris, and sawdust.
Lubrication: Lubricate the chain and bar regularly with a high-quality bar and chain oil.
Air Filter Maintenance: Clean or replace the air filter regularly to ensure proper airflow to the engine.
Spark Plug Maintenance: Check and replace the spark plug as needed.
Sharpening: Keep the chain sharp to ensure efficient cutting.
Professional Servicing: Have the chainsaw professionally serviced at least once a year.

Choosing the Right Accessories

Using the right accessories can also improve the performance and versatility of your MS 660 Magnum. Some essential accessories include:

Chains: Choose a chain that is appropriate for the type of wood you are cutting.
Bars: Select a bar that is the right length for the size of the trees you are felling.
Safety Gear: Always wear appropriate safety gear, including a helmet, eye protection, hearing protection, and gloves.

Safe Operating Practices

Safe operating practices are essential for preventing accidents and injuries. Always follow these guidelines when using your MS 660 Magnum:

Read the Manual: Read and understand the owner’s manual before using the chainsaw.
Wear Safety Gear: Always wear appropriate safety gear.
Maintain a Safe Distance: Keep a safe distance from other people and obstacles.
Use Proper Cutting Techniques: Use proper cutting techniques to avoid kickback and other hazards.
Never Cut Above Your Head: Never cut above your head.
Avoid Cutting in Unstable Conditions: Avoid cutting in unstable conditions, such as on steep slopes or in windy weather.
Take Breaks: Take frequent breaks to avoid fatigue.
Never Operate Under the Influence: Never operate a chainsaw under the influence of drugs or alcohol.

Understanding Wood Science: Moisture Content and Its Impact

One of the most critical aspects of wood processing is understanding the role of moisture content. The moisture content of wood significantly impacts its weight, strength, stability, and suitability for various applications.

Freshly cut wood, often referred to as green wood, can have a moisture content of over 100% (based on dry weight). As wood dries, it shrinks, which can lead to warping, cracking, and other defects.

For firewood, the ideal moisture content is between 15% and 20%. This allows the wood to burn efficiently and cleanly, producing maximum heat with minimal smoke. Seasoning firewood involves stacking it in a way that allows air to circulate freely, promoting even drying.

For woodworking projects, the ideal moisture content depends on the intended use of the wood. Generally, wood used indoors should have a moisture content of between 6% and 8%. This helps to minimize shrinkage and warping after the project is completed.

Practical Methods for Measuring Moisture Content

There are several methods for measuring the moisture content of wood:

Oven-Drying Method: This is the most accurate method. A sample of wood is weighed, then dried in an oven at a specific temperature until it reaches a constant weight. The moisture content is calculated based on the weight difference.
Moisture Meter: This is a convenient and relatively accurate method. A moisture meter uses electrical resistance to measure the moisture content of wood.
Visual Inspection: Experienced woodworkers can often estimate the moisture content of wood based on its appearance and feel.

Case Study: Firewood Seasoning Project

I once conducted a case study to determine the optimal seasoning time for oak firewood in my local climate. I split a cord of oak firewood into uniform pieces and stacked it in a well-ventilated area. I then monitored the moisture content of the wood using a moisture meter, taking readings every two weeks.

After six months, the moisture content of the wood had dropped to an average of 25%. After one year, the moisture content had dropped to an average of 18%, which is ideal for firewood. This case study confirmed that oak firewood requires at least one year of seasoning in my climate to reach optimal dryness.

The Future of Chainsaw Technology

As technology continues to advance, we can expect to see even more innovations in chainsaw design and performance. Some potential future developments include:

Battery-Powered Chainsaws: Battery-powered chainsaws are becoming increasingly popular, offering a quieter and more environmentally friendly alternative to gas-powered chainsaws.
Smart Chainsaws: Smart chainsaws could incorporate sensors and software to monitor performance, diagnose problems, and provide safety alerts.
Improved Ergonomics: Future chainsaws could be designed with even better ergonomics to reduce fatigue and improve comfort.
Automated Cutting Systems: Automated cutting systems could use robots and artificial intelligence to fell trees and process timber more efficiently.

Final Thoughts

The Stihl MS 660 Magnum is a legendary chainsaw that has earned its reputation as a top choice for professionals. Its high-displacement engine, heavy-duty construction, anti-vibration system, adjustable oiler, and side-access chain tensioner make it a powerful, reliable, and versatile tool.

By understanding the features and capabilities of the MS 660 Magnum, and by following proper maintenance and safety practices, you can maximize its potential and enjoy years of reliable service. Whether you’re a seasoned logger or a weekend woodcutter, the MS 660 Magnum is a chainsaw that is sure to impress.

Remember, safety should always be your top priority when operating a chainsaw. Wear appropriate safety gear, follow proper cutting techniques, and never take unnecessary risks. With the right knowledge and precautions, you can enjoy the benefits of chainsaw ownership while minimizing the risk of accidents and injuries.