The STIHL MS 661 R MAGNUM® professional chainsaw provides the reliable power and rugged dependability you need for felling, de-limbing, and bucking large diameter trees. 

It is the perfect partner for forestry, municipal, and tree service professionals. The STIHL MS 661 R is designed for tough felling jobs with its array of features including the wrap handle.

FEATURES

• MS-Wrap Handle (R) - Saw can be used in multiple positions for felling or limbing with hands in the proper positions.
• Ematic™ Lubrication System - The Ematic™ guide bar, when used with STIHL OILOMATIC® saw chain, will provide proper lubrication and less oil consumption than conventional methods. The system works because two ramps, strategically placed in the guide bar rail, help contain the flow of oil and direct all lubrication to the sliding faces of the bar and chain links as well as the rivets and driver holes, which in turn can reduce bar oil consumption up to 50%.
• STIHL ElastoStart™ - The ElastoStart™ starter handle is an exclusive feature of STIHL. It is a starting grip with a built-in shock absorber that helps reduce the effort when pulling on the starter cord. The ElastoStart™ starter grip noticeably reduces the sudden peak forces (compression) normally felt during cranking. The forces which occur at the grip after the first compression stroke are smoothed out.
• HD2 Air Filter - The HD2 air filter on this unit is washable, providing extremely long filter life and lowering maintenance costs. The large surface area allows for longer run times between cleanings and high performance even while operating in dusty and dry conditions. 
• IntelliCarb™ Compensating Carburetor - The IntelliCarb™ Compensating Carburetor is designed to automatically adjust the air/fuel ratio when the air filter becomes restricted or partially clogged and maintains the engine’s correct RPM. IntelliCarb™ uses air from the clean side of the air filter to control the diaphragm and flow of fuel. As the air filter becomes dirty and less air is available for the carburetor, the IntelliCarb™ system adjusts the fuel flow to compensate for the decrease in air flow. This is in contrast to typical carburetors that utilize this air from the “dirty” side of the air box.
• STIHL Quickstop® and a second chain braking system (Q) exclusive to STIHL - STIHL Quickstop® is designed to reduce the risk of injury in certain kickback situations. An additional manually activated chain brake is designed to engage when the operator ‘s right hand completely releases the rear handle, stopping the chain within one second.
• Bumper Spikes - These spikes prevent pull-in and provide better control which makes cutting easier.
• Lightweight Sprocket Cover with Captive Bar Nuts - For efficient saw chain maintenance, the sprocket cover is lightweight and the captive bar nuts are held securely in place.
• Adjustable Automatic Oiler - The Adjustable Automatic Oiler allows the user to adjust the lubricant of the guide bar and saw chain for different bar lengths and cutting conditions.