Original Instruction ManualPrinted on chlorine-free paper
Printing inks contain vegetable oils, paper can be recycled.
© ANDREAS STIHL AG & Co. KG, 2016
0458-737-8621-B. VA1.F16.
0000006612_008_GB
MS 251, MS 251 C
English
1
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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 26
Mounting the Bar and Chain (side
chain tensioner) 26
Mounting the Bar and Chain (quick
chain tensioner) 27
Tensioning the Saw Chain (side
chain tensioner) 29
Tensioning the Saw Chain (quick
chain tensioner) 30
Checking Chain Tension 30
Fuel 30
Fueling 32
Chain Lubricant 34
Filling Chain Oil Tank 34
Checking Chain Lubrication 35
Chain Brake 35
Winter Operation 36
Starting / Stopping the Engine 37
Operating Instructions 41
Taking Care of the Guide Bar 42
Shroud 43
Air Filter System 43
Cleaning the Air Filter 43
Engine Management 44
Adjusting the Carburetor 44
Spark Arresting Screen in Muffler 45
Spark Plug 46
Storing the Machine 47
Checking and Replacing the Chain
Sprocket 47
Maintaining and Sharpening the
Saw Chain 48
Maintenance and Care 52
Main Parts 54
Specifications 56
Ordering Spare Parts 57
Maintenance and Repairs 57
Disposal 58
STIHL Incorporated Federal
Emission Control Warranty
Statement 58
Trademarks 60
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