Stihl MS 251 Manual

82 MS 231, MS 231 C, MS 251, MS 251 C
: Check the buffers (1) and replace
if necessary, b 9.3.2
Installing
– Position filter base in the
carburetor box.
– Install the switch lever, b 10.1
– Fit the contact spring, b 7.7.4
– Use STIHL press fluid to simplify
assembly, b 14
: Push peg (1) on filter base (2)
into the bore in the buffer (3) as
far as stop.
2310RA314 TG
11
1
2310RA315 TG
3
2
: Line up the filter base (1) so that
the peg (2) is under the lug (3).
: Push the filter base (1) onto the
studs (arrows) and the
carburetor.
– Use STIHL press fluid to simplify
assembly, b 14
: Push the filter base (1) into the
buffer (2) – collar of peg must
project fully on the other side of
the buffer.
2
2310RA316 TG
1
3
2310RA317 TG
1
2
2310RA318 TG
1
– Install the choke rod, b 10.3.3
: Use punch-down tool
5910 890 4000 to press the short
circuit wire (1) into the
guides (arrows) so that the
marking (2) is at the edge of the
guide and the protective tube (3)
locates below the guide rib.
: Use punch-down tool
5910 890 4000 to press the
ground wire (1) into the
guides (arrows) so that the
marking (2) is at the edge of the
guide.
– Check operation of switch lever.
– Reassemble all other parts in the
reverse sequence.
2310RA148 TG
1
2
3
2310RA149 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