STIHL MS 661 Chainsaw Review

When it comes to professional-grade chainsaws for tough felling jobs, the STIHL MS 661 MAGNUM stands out as a formidable choice. Designed for forestry, municipal, and tree service professionals, this chainsaw promises not just power and efficiency but also the rugged dependability required to tackle large diameter trees with ease. Let’s delve into what makes the MS 661 MAGNUM a tool worthy of its reputation.

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Specifications of STIHL MS 661

POWER SOURCE	Gas
POWERHEAD WEIGHT	16.5 lbs.
GUIDE BAR LENGTH (Recommended)	25 in.
OILOMATIC CHAIN	3/8″ RS3
CHAIN OIL CAPACITY	13.5 oz.
ENGINE POWER	7.2 bhp
FUEL CAPACITY	28.7 oz.
DISPLACEMENT	91.1 cc

Power and Performance

At the heart of the MS 661 MAGNUM is its gas-powered engine, offering an impressive 7.2 brake horsepower (bhp) from a 91.1 cc displacement.

This combination ensures that the chainsaw has plenty of power to cut through large trees quickly and efficiently. The recommended 25-inch guide bar length is well-suited to the chainsaw’s capabilities, making it a versatile tool for various tasks, including felling, de-limbing, and bucking.

Insights: Transforming Daunting Tasks

The STIHL MS 661 MAGNUM has proven to be a game-changer, especially when faced with challenging tasks. A prime example was dealing with a large tree that had been blown down by a storm, a situation that initially seemed overwhelming.

However, with the MS 661 MAGNUM, this daunting task was made significantly easier and more manageable. The chainsaw’s raw power is undeniable, but it’s the combination of efficiency and ease of use that truly sets it apart.

Cutting through the thick trunk of the storm-fallen tree was not just quick but also surprisingly straightforward. This efficiency and user-friendly operation highlight why the MS 661 MAGNUM stands out as a professional-grade tool, capable of transforming potentially arduous jobs into manageable, even satisfying, tasks.

Efficiency and Environmental Consideration

STIHL has equipped the MS 661 MAGNUM with reduced-emission engine technology, showing its commitment to caring for nature while providing a powerful tool. The fuel-efficient engine not only contributes to lower operating costs but also reduces the environmental impact.

Durability and Maintenance

One of the standout features of the MS 661 MAGNUM is its HD2 air filter, designed for low maintenance and durability. The non-electronic, simple, and proven design further ensures that the chainsaw remains reliable over time with minimal upkeep. Additionally, features like the adjustable automatic oiler and the side-access chain tensioner make maintenance tasks more straightforward, ensuring the chainsaw runs smoothly.

User Comfort and Safety Features

Understanding the rigors of professional chainsaw use, STIHL has incorporated several features aimed at improving user comfort and safety.

The anti-vibration system significantly reduces operator fatigue, making it easier to handle the chainsaw for extended periods, especially with long guide bars. The decompression valve and STIHL ElastoStart are thoughtful additions that make starting the chainsaw less strenuous. Furthermore, the fuel and oil caps with retainers are a small yet practical feature that adds to the convenience of use.

Pros and Cons of the STIHL MS 661 MAGNUM Chainsaw

Pros

• The MS 661 MAGNUM’s engine delivers impressive power, making short work of even the largest trees. Its capability to handle demanding tasks effortlessly is a significant advantage for professionals.
• With its advanced engine technology, the chainsaw is not only powerful but also fuel-efficient, reducing running costs and environmental impact.
• The anti-vibration system and ergonomic design make it more comfortable to use for extended periods, reducing operator fatigue.
• Known for its rugged build and reliability, the MS 661 MAGNUM is built to withstand the rigors of professional use, offering long-term value.
• Features like the HD2 air filter and the side-access chain tensioner simplify maintenance, ensuring the chainsaw remains in top condition with minimal effort.

Cons

• Weighing in at 16.5 lbs, the MS 661 MAGNUM can be heavy for some users, potentially making maneuverability and prolonged use more challenging.
• As a professional-grade chainsaw, the MS 661 MAGNUM comes with a higher price tag, which might be a significant investment for non-professional users.
• Despite its ease of use, the chainsaw’s power and range of features may be overwhelming for beginners or those not accustomed to handling such powerful equipment.
• Being a gas-powered chainsaw, it requires proper fuel mix and maintenance to keep running smoothly, which might be inconvenient for some users compared to electric models.

STIHL MS 661 Chainsaw Maintenance

Keeping your STIHL MS 661 MAGNUM chainsaw in top condition requires some straightforward but crucial steps.

Before using the chainsaw, check the chain tension to ensure it’s not too loose or too tight, and make sure the chain is sharp for efficient cutting. Also, fill up on fuel and chain oil, and give the air filter a quick check to ensure proper engine ventilation. Don’t forget to inspect your safety gear for any wear or damage.

For regular upkeep, clean or replace the air filter as needed, and keep an eye on the spark plug, replacing it if you spot any wear. The fuel filter should be changed annually, and the chainsaw body should be kept free of debris. Lubricate the sprocket and bearings to maintain smooth operation.

Occasionally, you’ll need to adjust the carburetor, check the guide bar for wear, replace the chain as it wears out, and service the anti-vibration system to ensure continued comfort and safety. The decompression valve should also be checked for proper function.

If you’re storing the chainsaw for a long period, empty the fuel tank, clean the chainsaw thoroughly, apply a coat of oil to the chain and bar to prevent rust, and store it in a dry, safe place.

By sticking to these maintenance routines, you’ll ensure that your STIHL MS 661 MAGNUM remains reliable, safe to use, and ready for action whenever you need it. Always consult the user manual for specific maintenance advice tailored to your chainsaw.

Conclusion

The STIHL MS 661 MAGNUM chainsaw is a testament to what professional-grade equipment can achieve. With its powerful and efficient engine, user-friendly maintenance and safety features, and the rugged dependability STIHL is known for, it’s a tool that lives up to its promises. Whether it’s for felling large trees or clearing storm damage, the MS 661 MAGNUM is designed to save time and reduce effort, making it a highly recommended choice for professionals in need of a reliable chainsaw that can handle the rigors of their work.

FAQs

1. Can the MS 661 MAGNUM be used for artistic wood carving, or is it too powerful?
   While primarily designed for heavy-duty tasks like felling and bucking large trees, with the right chain and guide bar, skilled users can adapt the MS 661 MAGNUM for more delicate wood carving projects.
2. What’s the largest diameter tree the MS 661 MAGNUM can comfortably cut through?
   The MS 661 MAGNUM, especially when equipped with its recommended 25-inch guide bar, can tackle trees of significant diameter. With proper technique, it can cut through trees over 48 inches in diameter, though larger tasks may require multiple cuts from different angles.
3. How does altitude affect the performance of the MS 661 MAGNUM?
   Like all gas-powered chainsaws, the MS 661 MAGNUM might experience a decrease in power at high altitudes due to thinner air affecting combustion. Adjustments to the carburetor settings might be necessary to maintain optimal performance.
4. Can the MS 661 MAGNUM run on biofuel or other alternative fuels?
   The MS 661 MAGNUM is designed to run on gasoline mixed with a specific ratio of oil. Using biofuel or alternative fuels is not recommended as they can affect engine performance and may void the warranty.
5. What are the implications of using a longer or shorter guide bar than recommended on the MS 661 MAGNUM?
   Using a longer guide bar can provide greater reach and ability to cut larger trees but may reduce cutting efficiency and control. A shorter bar enhances maneuverability and control for smaller tasks but limits the size of wood you can cut in a single pass.
6. How does the MS 661 MAGNUM’s anti-vibration system work, and how effective is it in reducing fatigue?
   The anti-vibration system uses rubber elements or springs to isolate the handles from the engine and cutting equipment, significantly reducing the vibrations transmitted to the operator. This system effectively reduces fatigue and allows for longer periods of use with greater comfort.
7. Is there a recommended break-in period for the MS 661 MAGNUM, and how should it be handled?
   Yes, like most high-performance engines, the MS 661 MAGNUM benefits from a break-in period. During the first few tanks of fuel, avoid pushing the chainsaw to its limits. Gradually increasing the engine’s workload helps ensure internal components wear in smoothly, leading to longer engine life and better performance.
8. How does the MS 661 MAGNUM’s fuel efficiency compare to older STIHL models or competitors?
   Thanks to its advanced engine technology, the MS 661 MAGNUM is more fuel-efficient than many older models and some competitors, offering a better power-to-fuel consumption ratio. This efficiency reduces operating costs and environmental impact.
9. Can the MS 661 MAGNUM be equipped with aftermarket parts, or is it recommended to use only STIHL parts and accessories?
   While aftermarket parts can be used, for optimal performance and safety, it’s recommended to use genuine STIHL parts and accessories. These are specifically designed to meet the chainsaw’s specifications and quality standards.
10. What’s the most unusual but effective use of the MS 661 MAGNUM reported by users?
    Some users have creatively employed the MS 661 MAGNUM for ice sculpting during winter events, swapping the standard chain for a specialized ice cutting chain. This showcases the chainsaw’s versatility and power across different mediums.

We hope you found this review of the STIHL MS 661 MAGNUM chainsaw insightful and helpful! Whether you’re a seasoned professional or just curious about high-performance chainsaws, we’d love to hear from you. Do you have experiences or tips to share about using this powerhouse? Maybe you’re considering it for your next big project? Drop your thoughts and questions in the comments below. Let’s keep the conversation going and learn from each other’s experiences. Don’t forget to share this review with anyone who might find it useful. Happy cutting!

David Murray

Forestry Author

I'm David Murry, a forestry equipment specialist with a focus on chainsaw operation. With over 13 years of experience, I've honed my skills in operating and maintaining a wide range of machinery, from chainsaws to log splitters. My passion for the outdoors and commitment to sustainable forestry drive my work, which emphasizes safety, efficiency, and staying updated with industry advancements. Additionally, I'm dedicated to sharing my expertise and promoting environmental awareness within the forestry community.