Stihl MS 172 User Manual

Fault Cause Remedy
Insufficient saw chain
oil in the oil tank.
► Fill up with saw chain oil.
The saw chain is
over-tensioned.
► Tension the saw chain as specified.
The chainsaw is not
being used properly.
► Have correct use explained, then practice.
18.2 Adjust idle speed
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The Engine stops while idling
► Start the engine and release the chain brake.
► Warm up the engine by opening and closing
the throttle for about 1 minute.
► If the engine continues to stop while idling:
Turn the idle speed screw LA 1/2 turns clock‐
wise and start the engine up again.
► Turn the idle speed screw LA clockwise until
the saw chain begins to run.
► Turn the idle speed screw LA 1 turn counter‐
clockwise.
Saw chain runs continuously while engine is
idling
► Start the engine and release the chain brake.
► Warm up the engine by opening and closing
the throttle for about 1 minute.
► Turn the idle speed screw LA counterclock‐
wise until the saw chain stops running.
► Turn the idle speed screw LA 1 turn counter‐
clockwise.
18.3 Venting the Combustion Cham‐
ber
► Engage the chain brake.
2
3
1
1
1
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► Turn the shroud locks (1) counterclockwise
until the cover (2) can be removed.
► Remove cover (2).
► Pull off the spark plug boot (3).
► Unscrew the spark plug.
► Dry the spark plug.
WARNING
■ If the starter grip is pulled out while the spark
plug boot is removed, sparks may escape.
Sparks may cause fires and explosions in
highly flammable or explosive environments.
Persons may be seriously or fatally injured
and property may be damaged.
►
Move the Master Control Lever to posi‐
tion
and hold it there before pulling out
the starter grip.
►
Move the Master Control Lever to position
and hold it there.
► Pull the starter grip and guide it back several
times.
You have vented the combustion chamber.
► Insert and tighten down the spark plug.
3
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► Press the spark plug boot (3) firmly home.
► Fit the cover (2).
► Turn the shroud locks (1) clockwise and
tighten them firmly.
The cover (2) is closed.
19 Specifications
19.1 STIHL MS 162, MS 172 Chain‐
saw
MS 162
–
Displacement: 30.1 cm³
–
Engine power to ISO 7293: 1.3 kW (1.8 bhp)
19 Specifications English
0458-200-0121-B 27

Stihl MS 172 Specifications

General

Sound pressure level	100 dB(A)
Sound power level	113 dB(A)
Displacement	31.8 cc (1.9 cu in)
Saw chain pitch	3/8"
Recommended bar length	30-35 cm (12-14 in)