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Stihl MS 172 User Manual

Stihl MS 172
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Allow the chainsaw to cool down before
opening the fuel tank cap.
Open the fuel tank cap slowly and not all at
once.
Clothing that has been in contact with fuel or
gasoline will become more easy to ignite. Per‐
sons may be seriously or fatally injured and
property may be damaged.
If your clothing comes into contact with fuel
or gasoline: Change your clothing.
Fuel mix, gasoline and two-stroke engine oil
can harm the environment.
Do not spill fuel, gasoline or two-stroke
engine oil.
Dispose of fuel mix, gasoline and two-
stroke engine oil in accordance with local
regulations and environmental require‐
ments.
Fuel, gasoline or two-stroke engine oil can
cause irritation if they come into direct contact
with the skin or eyes.
Avoid contact with fuel, gasoline and two-
stroke engine oil.
If skin contact occurs: Wash affected areas
of skin with plenty of water and soap.
If eye contact occurs: Flush eyes with
plenty of water for at least 15 minutes and
consult a doctor.
The ignition system of the chainsaw generates
sparks. Unconfined sparks may cause a fire or
an explosion in an easily combustible or explo‐
sive environment. Persons may be seriously
or fatally injured and property may be dam‐
aged.
Use the spark plugs described in this
instruction manual.
Insert and tighten down the spark plug.
Connect the spark plug boot and press it
down firmly.
The saw can be damaged if it is run on a mix‐
ture of fuel which includes unsuitable gasoline
or unsuitable two-stroke engine oil, or if an
incorrect mix ratio of gasoline and two-stroke
engine oil is used.
Mix the fuel as described in this instruction
manual.
The mixture of gasoline and two-stroke engine
oil can separate or age if it is stored for a long
period. The chainsaw can be damaged if it is
used with a fuel mix that has separated or has
aged.
Before refueling the saw: Thoroughly mix
the fuel.
Use a mixture of gasoline and two-stroke
engine oil that is not older than 30 days
(STIHL MotoMix: 5 years).
4.8 Working
4.8.1 Sawing
WARNING
Always work within calling distance of others
in case help is needed.
If the engine is not started properly, the user
may lose control of the chainsaw. This can
result in serious injuries.
Start the engine as described in this instruc‐
tion manual.
If the saw chain is touching the ground or
objects: Do not start the engine.
The user cannot concentrate on the work in
certain situations. The user can lose control of
the saw, trip or fall and be seriously injured.
Work calmly and carefully.
If light and visibility are poor: Do not use
your saw.
Operate the chain saw alone.
Do not work above shoulder height.
Watch out for obstacles.
Stand on the ground while working and
keep a good balance. If it is necessary to
work at heights: Use a lift bucket or a safe
platform.
If you begin to feel tired: Take a break.
Exhaust gas is produced when the engine is
running. Breathing in exhaust gas can have
toxic effects.
Avoid inhaling exhaust gas.
Operate the chainsaw is a well ventilated
location.
In the event of nausea, headache, visual
disturbances, problems with hearing or diz‐
ziness: Stop work and seek medical advice.
The user’s ability to hear and assess noises is
restricted when wearing hearing protection
with the engine running.
Work calmly and carefully.
The user will not be able to control the chain‐
saw properly if it is operated with the Master
Control lever in the position
. This can result
in serious injuries.
Move the Master Control lever to position .
Start the engine as described in this instruc‐
tion manual.
Do not accelerate the engine with the chain
brake engaged since this can damage the
chain brake.
Disengage the chain brake before you start
cutting.
The rotating saw chain can cut the operator.
This can result in serious injuries.
4 Safety Precautions English
0458-200-0121-B 7

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Stihl MS 172 Specifications

General IconGeneral
Sound pressure level100 dB(A)
Sound power level113 dB(A)
Displacement31.8 cc (1.9 cu in)
Saw chain pitch3/8"
Recommended bar length30-35 cm (12-14 in)

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