Stihl MS 251 Manual

29MS 231, MS 231 C, MS 251, MS 251 C
: Attach the brake cable (1) to the
bore (arrow) in the brake
lever (2).
: Slide the brake cable retainer
with lug (1) through the opening
and press it into its seat (arrow).
: Insert and tighten down the
screw (2) firmly.
2710RA079 TG
1 2
2
1
2310RA059 TG
When lifting the tank housing make
sure the grommet (1) is pushed fully
into the adjusting screw (2) – if this
is not the case, the adjustment of
the brake cable will vary.
– Check position of fuel hose and
correct if necessary, b 12.11.2
– Check position of fuel return hose
and correct if necessary,
b 12.11.3
– Lift the tank housing and secure it
in position, b 12.11.2
: Position the brake cable (1) in the
guide (arrow).
– Install the switch lever, b 10.3.1
– Install the throttle trigger, b 10.3
1
2310RA060 TG
2
1
2310RA063 TG
– Reassemble all other parts in the
reverse sequence.
– Check operation and adjust the
brake cable, b 5.4.1
5.5 Chain Tensioner
– Troubleshooting, b 3.2
: Turn the spur gear (2) clockwise
until the tensioner slide (1) butts
against the right-hand end and
the screw (3) is visible.
: Take out the screw (3).
: Pull out the spur gear (2) and
tensioner slide (1).
2
1
2310RA066 TG
3
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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