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Original Instruction ManualPrinted on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled.
© ANDREAS STIHL AG & Co. KG, 2013
0458-737-8621-A. VA1.B13.
0000006312_002_GB
MS 251, MS 251 C
English
1
{
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 23
Mounting the Bar and Chain (side
chain tensioner) 24
Mounting the Bar and Chain (quick
chain tensioner) 25
Tensioning the Saw Chain (side
chain tensioner) 27
Tensioning the Saw Chain (quick
chain tensioner) 27
Checking Chain Tension 28
Fuel 28
Fueling 29
Chain Lubricant 32
Filling Chain Oil Tank 33
Checking Chain Lubrication 33
Chain Brake 34
Winter Operation 35
Starting / Stopping the Engine 35
Operating Instructions 40
Taking Care of the Guide Bar 41
Shroud 41
Air Filter System 42
Cleaning the Air Filter 42
Engine Management 43
Adjusting the Carburetor 43
Spark Arresting Screen in Muffler 44
Spark Plug 44
Replacing the Starter Rope and
Rewind Spring 46
Storing the Machine 49
Checking and Replacing the Chain
Sprocket 49
Maintaining and Sharpening the
Saw Chain 50
Maintenance and Care 54
Main Parts 56
Specifications 58
Special Accessories 59
Ordering Spare Parts 59
Maintenance and Repairs 60
Disposal 60
STIHL Incorporated Federal
Emission Control Warranty
Statement 60
Trademarks 62
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