Talk about legendary. If there are large trees that must be felled, more than likely, this is the saw that gets the nod. The MS 661c's amazing power-to-weight ratio gives you a whole lot more power (a 20% increase in engine power over the MS 460!) with only a marginal increase in weight. Small wonder, then, that it’s been the chain saw of choice for so many professionals, and the saw chosen for use in the STIHL® TIMBERSPORTS® Series.

STIHL professional chain saws are made to deliver the power you need when cutting wood is not just a hobby, but a way of life. With high power-to-weight ratios and heavy-duty components, a gasoline-powered STIHL professional saw will keep you cutting day in and day out with these features:

High-tech Magnesium Housing provides long-lasting wear.
An Adjustable Bar and Chain Oiler allows the operator to adjust the oil flow for long bars or dirty cutting conditions in max position. It also saves oil when using short bars in clean conditions.
An IntelliCarb™ Compensating Carburetor automatically adjusts the air/fuel ratio to maintain optimal performance during changing environmental conditions.
The Extra Slim Profile is ideal for overall comfort and ease of use.
Its Side-access Chain Tensioner allows for easy tensioning of the saw chain.
The Master Control Lever™ is a single lever that allows the user to operate the choke, starting throttle lock and on-off switch all from one convenient location.
STIHL manufactures its own saw chain for optimal performance and compatibility with your STIHL chain saw. Swiss-made STIHL OILOMATIC® Saw Chain is pre-stretched before it leaves the factory, which helps eliminate excessive stretching during the break-in period, reducing maintenance time and component wear.
The Electronic Ignition provides easier starting and smoother running.
An Anti-vibration System helps reduce operator fatigue and improves comfort.
Our Ematic™ Bar Lubrication System delivers proper lubrication while reducing oil usage by up to 50%.
Designed to stop the chain in fractions of a second, the STIHL Quickstop® Chain Brake System can be activated manually or by inertia if the kickback force is sufficient.
The Translucent Fuel Tank allows the operator to easily check the fuel level before starting work while the Balanced Fuel and Oil Tank Capacities allow for efficient refills.
The Front Handle is designed for a secure grip and is ergonomically angled for comfort.
Front and Rear Hand Guards help reduce the risk of injury.
Bumper Spikes help prevent pull-in and provide better control, making cutting easier.
An All-position Carburetor allows the engine to run at full power in any approved operational position.
A Combination Wrench/Screwdriver is supplied, providing easy and convenient adjustments to the saw.
The Chain Catcher helps reduce the risk of operator contact by a chain if it should break or derail.
Features like Heavy-duty Centrifugal Clutches, High-pressure Alloy Die Castings and STIHL-designed cylinders help provide durable, long-lasting wear.
The Easy-to-Access Air Filters and Protected Spark Plugs provide easy chain saw maintenance.
The Spark Arrester Muffler is designed to reduce noise levels and the emission of sparks.
The Smooth Clean Design has no rough edges to snag on clothing or brush.
When your livelihood is on the line, choose the legendary power of STIHL chain saws.

MS 660 MAGNUM® Specifications - Professional Use
DISPLACEMENT 91.6 cc (5.6 cu. in.)
ENGINE POWER 5.2 kW (7.0 bhp)
POWERHEAD WEIGHT 7.5 kg (16.5 lbs.)
GUIDE BAR LENGTHS* (Recommended ranges) 40 to 90 cm (16" to 36")
FUEL CAPACITY 825 cc (27.9 oz.)
CHAIN OIL CAPACITY 360 cc (12.2 oz.)
OILOMATIC® CHAIN 3/8" RS3