Stihl MS 661 C-M Installation, Operation & Maintenance Manual

Original Instruction ManualPrinted on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled.
© ANDREAS STIHL AG & Co. KG, 2015 0458-759-8621-A. VA3.E15. 0000006426_006_GB
MS 661 C-M
English
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This instruction manual is protected by copyright. All rights reserved, especially the rights to reproduce, translate and process
with electronic systems.
Contents
Allow only persons who fully understand
this manual to operate your chain saw.
To receive maximum performance and
satisfaction from your STIHL chain saw,
it is important that you read, understand
and follow the safety precautions and
the operating and maintenance
instructions in chapter "Safety
Precautions and Working Techniques"
before using your chain saw. For further
information you can go to
www.stihlusa.com.
Contact your STIHL dealer or the STIHL
distributor for your area if you do not
understand any of the instructions in this
manual.
WARNING
Because a chain saw is a high-speed
wood-cutting tool, some special safety
precautions must be observed as with
any other power saw to reduce the risk
of personal injury. Careless or improper
use may cause serious or even fatal
injury.
Guide to Using this Manual 2
Safety Precautions and Working
Techniques 3
Cutting Attachment 25
Mounting the Bar and Chain 26
Tensioning the Chain 27
Checking Chain Tension 28
Fuel 28
Fueling 29
Chain Lubricant 31
Filling Chain Oil Tank 31
Checking Chain Lubrication 32
Chain Brake 32
Winter Operation 33
Electric Handle Heating 34
Starting / Stopping the Engine 34
Operating Instructions 38
Oil Quantity Control 39
Taking Care of the Guide Bar 39
Remove air filter 40
Cleaning the Air Filter 40
Engine Management 41
M-Tronic 41
Spark Arresting Screen in Muffler 41
Spark Plug 42
Rewind Starter 43
Storing the Machine 43
Checking and Replacing the Chain
Sprocket 44
Maintaining and Sharpening the
Saw Chain 45
Maintenance and Care 49
Main Parts 51
Specifications 53
Ordering Spare Parts 54
Maintenance and Repairs 55
Disposal 55
STIHL Incorporated Federal
Emission Control Warranty
Statement 55
Trademarks 57

Stihl MS 661 C-M Specifications

General

Idle speed	- RPM
Motor type	2-stroke motor
Chain pitch	3/8 \
Blade length	800 mm
Product color	Black, Grey, Orange
Automatic oiling	Yes
Engine displacement	91.1 cm³
Power source	Gasoline
Sound power level	118 dB
Vibration emission	6.9 m/s²
Sound pressure level	105 dB

Weight and Dimensions

Weight	7400 g