Stihl MS 251 Manual

27MS 231, MS 231 C, MS 251, MS 251 C
Adjusting brake cable
: Take out the screw (1).
: Lower the tank housing (2).
: Loosen the clamp screw (1) on
the brake cable retainer.
: Use 6mm open end wrench the
set free travel on the adjusting
screw (1).
2310RA049 TG
1
2
2310RA050 TG
1
2310RA051 TG
1
2
– Turn adjusting screw clockwise
to increase free travel.
– Turn adjusting screw counter-
clockwise to reduce free travel.
: When the setting is correct,
tighten down the clamp screw (2)
firmly.
– Press down the lockout lever (1)
and hold it in that position.
The brake band (1) must locate
snugly against engine
housing (arrows) and the clutch
drum must rotate freely.
– Reassemble all other parts in the
reverse sequence.
5.4.2 Brake cable
Removing and Installing
– Disconnect the brake spring,
b 5.4
– Remove the carburetor, b 12.5
– Remove the throttle trigger,
b 10.3
– Remove the switch lever,
b 10.3.1
TOP
2310RA044 TG
1
: Pull out the brake cable (1) a little
and disconnect it.
– Loosen and lower the tank
housing, b 12.11.2
– Take care not to stretch the hose.
: Take out the screw (1).
: Remove the retainer (2) with
brake cable.
– Check the brake cable (1) and
retainer (2), replace if necessary
TOP
2310RA052 TG
1
1
2
2310RA057 TG2310RA053 TG
1
2
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Stihl MS 251 Specifications

General

Idle speed	2800 RPM
Motor type	2-stroke motor
Chain pitch	1/308 \
Blade length	450 mm
Product color	Black, Grey, Orange
Motor speed (max)	10000 RPM
Oil tank capacity	0.2 L
Fuel tank capacity	0.39 L
Engine displacement	45.6 cm³
Kickback protection	Yes
Engine power	3 hp
Power source	Gasoline
Sound power level	114 dB
Vibration emission	3.9 m/s²
Sound pressure level	103 dB

Weight and Dimensions

Weight	4900 g