MS 660 MAGNUM®
A professional chainsaw with one of the best power-to-weight ratios in the industry.
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 660’s amazing power-to-weight ratio gives you a whole lot more power (a 15% increase in engine power over the MS 460!) with only a marginal increase in weight. Small wonder, then, that it’s been the chainsaw of choice for so many professionals, and the saw chosen for use in the STIHL® TIMBERSPORTS® Series. (Wrap-handle version available in select areas. See MS 660 R.)
|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|
|STIHL recommends #3624 (33 RS3 84) OILOMATIC® saw chain and 25" 3003 000 4030 STIHL ROLLOMATIC® ES guide bar combination. The actual listed guide bar length can vary from the effective cutting length depending upon which powerhead it is installed.|
WARNING! The occurrence called “kickback” can cause serious
or fatal injury. Always read the instruction manual carefully before
using your saw. STIHL uses a green and yellow color-coding
system to help you select a powerhead, bar and chain combination
that complies with the kickback requirements of ANSI
Standard B175.1 (gasoline-powered saws) and §30 of UL 1662/
ANSI Standard B175.1 (electric chain saws). Ask your STIHL
dealer about safe operating procedures and the advantages of
the STIHL Quickstop® chain brake, STIHL Quickstop® Plus additional chain braking feature (Q), STIHL reduced kickback bars and STIHL low-kickback
STIHL recommends the use of green reduced kickback bars and green low kickback chains on all STIHL chain saws.
* The actual listed guide bar length can vary from the effective cutting length depending upon which power head it is installed.
Note: STIHL recommends use of fuel with no more than 10% Ethanol content. Using fuel with greater than 10% Ethanol content may cause damage to your equipment and may void your STIHL warranty. Learn More…
WARNING! Improper use of any power tool may cause serious
or fatal injury. Read, understand and follow carefully the operating
and safety instructions in your instruction manual before using such products.
STIHL products sold through U.S. STIHL dealers are for distribution in the United States only.
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.
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.
Fuel and oil caps with retainers
The fuel and oil cap retainers keep the caps attached to the unit for added convenience.
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.
Side-Access Chain Tensioner
The side-access chain tensioner makes it much more convenient for the user to adjust the saw chain with a bar wrench as opposed to the typical location of the guide bar adjustment screw.
The decompression valve, also referred to as 'deco' or 'deco valve', vents compression in the cylinder for easier starting. The decompression valve temporarily reduces the compression in the combustion chamber during cranking and helps reduce the effort needed to pull the starter rope. It is opened manually and closes automatically as soon as the engine fires.
The Winter/Summer Shutter allows the carburetor to operate at optimum temperature year-round and helps to prevent carburetor icing when working below 50°F (10°C).
Common Features for Chain Saws
View the features common to many STIHL chain saws.
You Will Also Need
Don’t let friction cut down your chainsaw’s performance. STIHL bar and chain oil is specially formulated to adhere to your chainsaw’s bar and chain, providing optimal lubrication. Special oils help prevent sap and pitch from clinging, prolonging cutting performance and the lifespan of your chain parts. Ideal for use in moderate temperatures, STIHL bar and chain oil provides quality protection for your chainsaw – bar none.
Just like our chainsaws, our case can handle multiple tasks. Use it to carry and transport your chainsaw to and from the work site. It is also ideal for storage when your workday is done. It’s unique, removable bar scabbard has built-in tool holders to carry tools to the cutting site. Fits MS 170 to MS 460 with 20” bar. (Excludes MS 441 and wrap-handle saws.) Replacement parts available.
No matter how you slice it (or trim it or shred it), there’s no better protection for your high performance 2-stroke engine than STIHL HP Ultra. This 2-cycle engine oil has outstanding engine cleaning characteristics, plus “ultra” lubricating qualities that’s superior to other 2-cycle engine oils. This fully synthetic oil is also highly biodegradable, degrading by 80% in 21 days. We’re so confident this oil will protect your engine, we’ll double your STIHL limited warranty* when you use it. It’s that good.
*Double your warranty when you include STIHL HP Ultra Oil (six 2.6-oz. bottles) or STIHL MotoMix® premixed fuel (six 32-oz. cans or a 1-gal. container) with your STIHL product purchase. Double limited warranty protection applies to STIHL gasoline-powered products purchased and registered for personal non-income producing, family and household purposes only. Other restrictions apply. See dealer for details.
Includes file guide, depth gauge, round file, flat file and two file handles in tool pouch. Kits available for the following chain types: STIHL PICCO™ Mini; 1/4" pitch chain; .325" pitch chain; 3/8" pitch chain; .404" pitch chain.
For Your Safety
For heavyweight protection that won’t weigh you down, choose Pro Mark™ Apron Chaps from STIHL. They’re rugged, yet comfortable to wear and easily fit over your work clothes. Sewn into the legs of the chaps are nine layers of Avertic™ Pro by Engtex®, a cut-retardant material designed to reduce the risk or severity of injury to the body parts covered by the pads in the event of contact with the rotating saw chain of a gasoline-powered chainsaw. The open-back design of these chaps makes them a great choice for hot working conditions. These Pro Mark™ apron chaps provide three additional layers of Avertic™ Pro by Engtex® cut retardant material than our standard apron chaps. STIHL chainsaw protective apparel is also wash and wear, unlike some other brands that require dry cleaning or light surface cleaning.
The STIHL Pro Mark™ designation identifies products for professional users.
Available color: High Visibility Orange
Available lengths: 32", 36", 40"
See it in action!
Get a grip on your chainsaw with STIHL Cut-Retardant Mitts. Made with water-resistant nylon backs and goatskin palms, these mitts offer exceptional comfort and grip without sacrificing dexterity. Avertic™ Pro by Engtex®, a cut-retardant material, is sewn into the back of the left glove. These mitt-style gloves also feature a separate index finger for chainsaw throttle operation, while hook and loop wrist straps make fitting a breeze. These chainsaw protective gloves are an excellent choice for the professional logger. STIHL chainsaw protective apparel is also wash and wear, unlike some other brands that require dry cleaning or light surface cleaning.
Available color: High Visibility Orange
Available sizes: S (8), M (9), L (10), XL (11)
The woods can hold many dangers. Stay one step ahead with the Forestry Helmet System from STIHL. The protection starts with a hard shell of ABS thermoplastic. It gets even better with a six-point, ratchet-style suspension system that absorbs shock and keeps the helmet stable while you work.
The system also features a Cool Guard sweatband to keep perspiration out of your eyes, as well as a built-in rain gutter to direct rain away from your face during inclement weather. Adjustable hearing protectors comfortably reduce noise while an epoxy-coated steel full-face screen helps protect from flying debris.
Hard hat meets ANSI Z89.1-2003 Type 1 Class G. Hearing protectors meet ANSI S3.19-1974 and have a Noise Reduction Rating (NRR) of 24 dB(A).