STIHL MS 660 Magnum Specifications And Features

The STIHL MS 660 Magnum is one of those tools that grabs your attention as soon as you hear its name—a powerhouse among professional chainsaws. Renowned as a legendary saw, the STIHL MS 660 Magnum stands out as one of the most beloved models used in the STIHL® TIMBERSPORTS® Series. Its prowess stems from boasting one of the industry’s best power-to-weight ratios. Now, with the permission of eBay seller Sherman Saw Parts, we delve into images of an MS 660 Magnum sold for $549.99 in September 2023. This remarkable chainsaw has become a favorite among both professionals and hobbyists alike.

STIHL MS 660 Specs

STIHL MS 660 MAGNUM
SERIES:	1122
YEARS MADE:	2004 – 2014
VERSIONS:	MS 660, MS 660 R, MS 660 W (Artic)
DISPLACEMENT:	91.6 cc / 5.6 cu. in.
POWER:	7.0 hp / 5.2 kW
CYLINDER BORE:	54 mm / 2.12 in.
PISTON STROKE:	40 mm / 1.57 in.
PISTON RING THICKNESS:	2 of 1.2 mm
CYLINDER TYPE:	Aluminum with chrome plated bore
INTAKE METHOD:	Piston ported
WEIGHT:	660: 7.5 kg / 16.5 lbs 660 W: 7.6 kg / 16.8 lbs
HANDLEBAR SYSTEM:	Anti-Vibration
CHAIN BRAKE:	Inertia Activated
CLUTCH:	Centrifugal, 3 metal shoes
DRIVE TYPE:	Direct
CONSTRUCTION:	Die-cast Magnesium, polymer
MAGNETO TYPE:	Electronic
CARBURETOR:	Walbro WJ-67
AIR FILTER SYSTEM:	Filter element
OIL TANK CAPACITY:	36 ml / 12.2 fl. oz.
OIL PUMP:	Automatic, adjustable flow
MAXIMUM ENGINE RPM:	13,500
IDLE RPM:	2,500
IGNITION TIMING:	Fixed
BREAKER POINT SETTING:	none
SPARK PLUG TYPE:	NGK BPMR 7 A, Bosch WSR 6 F
SPARK PLUG GAP:	0.5 mm / 0.020 in.
FUEL TANK CAPACITY:	825 ml / 27.9 fl. oz.
FUEL OIL RATIO:	50:1
CHAIN GAUGE:	0.050 in / 1.3 mm or 0.063 in / 1.6 mm
CHAIN PITCH:	3/8 in. / 9.32 mm
CHAIN TYPE:	RSC 3
SPROCKET NOSE:	10-tooth
BAR LENGTHS:	20, 22, 25, 28, 32 or 36 in. / 50, 55, 63, 70, 80 or 90 cm

When it comes to the MS 660 series, it’s important to understand that all models are labeled as MAGNUMS—a marketing term denoting the larger Stihl chainsaws. Variations within this series include:

MS 660 Magnum: The standard base model.
MS 660 Magnum R: Equipped with a wrap handle, sometimes listed as MS 660 W.
MS 660 Magnum W or Arctic: Features a heated carburetor and electronically heated handles.

Despite their differences in features, all versions share the same engine and basic specifications.

For those familiar with Stihl’s chainsaw lineup, the predecessor to the MS 660 is the STIHL 066 Magnum, while the current iteration is the STIHL MS 661. These models represent the evolution and advancements within the Stihl chainsaw family, each catering to specific needs and preferences of users.

STIHL MS 660 Features

Magnesium construction sets the MS 660 apart from its plastic homeowner saw counterparts, ensuring durability and longevity. However, it’s worth noting that not all MS 660s come with the same features; variations depend on the year of production. Earlier models may lack certain features found in later versions.

Some key features of the MS 660 include:

Magnesium Casing: Known for its long-lasting wear, providing robust protection for the engine and internal components.
IntelliCarb Compensating Carburetor: Automatically adjusts the air-to-fuel ratio to maintain optimal performance, even as the air filter becomes clogged, ensuring consistent power delivery.
Decompression Valve: Facilitates easier starting by reducing cylinder compression, making the pull-start process notably smoother and requiring less effort.
Fuel and Oil Caps with Retainers: Designed for convenience and practicality, these caps create a tight seal to prevent leaks, while retainers keep them securely attached to the chainsaw during refueling or maintenance.
ElastoStart Starter Handle: Incorporates a shock-absorbing component to reduce the strain on the user’s hand during starting, improving comfort and usability.
Adjustable Automatic Bar and Chain Oiler: Allows users to customize the lubrication level based on cutting conditions, promoting better performance and prolonging chain life.
Side Access Chain Tensioner: Positioned for easy reach, enabling quick and tool-free adjustment of the saw chain tension.
Carburetor Preheat Shutter: Enables adjustment of the carburetor’s air intake for optimal engine performance in both cold (winter) and warm (summer) conditions.
Heavy-duty Air Filter: Offers enhanced protection against dust and debris, extending the engine’s lifespan and ensuring cleaner air intake, even in challenging work environments.
Sleek Profile: Designed with user comfort and usability in mind, making it suitable for extended, full-time use.

Unified Control Lever: Streamlines operation with single-point access to choke, start throttle lock, and power switch, reducing the risk of accidental stops.
STIHL-Specific Saw Chain: Crafted in Switzerland and pre-extended at the factory, minimizing wear and maintenance requirements.
Electronic Ignition: Ensures effortless starting and smooth operation, a standard feature on most chainsaws since the MS 660’s initial release.
Vibration-Dampening System: Prioritizes user comfort by minimizing fatigue, with Stihl’s renowned anti-vibration technology setting a global standard.
Ematic Bar Oil System: Provides efficient lubrication while potentially reducing oil consumption by half.
STIHL Quickstop Chain Brake System: Enables rapid chain halting, either manually or via inertia activation, enhancing safety during operation.
Clear Fuel Reservoir: Facilitates quick fuel level checks and balanced capacities for efficient refueling.
Ergonomically Designed Front Handle: Ensures a comfortable and secure grip for extended use.
Safety Guards: Front and rear guards minimize the risk of injuries during operation.
Bumper Spikes: Enhance control and cutting ease by providing improved stability.
Universal Carburetor: Maintains consistent engine performance regardless of position.
Chain Guard Feature: Reduces the likelihood of user contact with a misaligned chain, enhancing safety.
Durable Components: Robust centrifugal clutches, high-strength alloy castings, and STIHL-specific cylinders contribute to long-term durability.
Accessible Maintenance Points: Simplify maintenance tasks with easily accessible air filters and shielded spark plugs.
Spark Arrestor Muffler: Reduces noise and spark emissions, ensuring compliance with environmental regulations.
Smooth Design: Features no rough surfaces that might snag on clothing or foliage, further enhancing user experience and safety.

These features collectively establish the MS 660 as a reliable and user-friendly professional chainsaw, capable of meeting the demands of rigorous work environments with ease.

Magnum Specifications

It’s worth noting that this particular MS 660 Magnum was sold without a bar and chain, highlighting its versatility and adaptability to various user needs. As one of the most powerful offerings from Stihl, the MS 660 Magnum stands at the forefront of high-spec chainsaws. Its top-end features make it a go-to choice for professional loggers and tree care specialists alike, excelling in tasks such as milling, felling, and bucking large logs. Whether tackling demanding forestry work or precision milling projects, the MS 660 Magnum delivers unparalleled performance and reliability.

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