Stihl MS 251 Manual

53MS 231, MS 231 C, MS 251, MS 251 C
: 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,
b 10.1
– Reassemble all other parts in the
reverse sequence.
2310RA148 TG
1
2
3
2310RA149 TG
1
2
7.7.3 Ground Wire
Test and install the ground wire as
described for the short circuit wire.
– Check for contact and continuity
and
replace the wiring harness if
necessary, b 7.7
7.7.4 Contact Spring
The ground wire must be firmly
seated in the contact spring's loop,
perform contact and continuity test if
necessary, b 7.7.1.
– Pull the filter base off the studs,
b 12.3
: Swing the filter base (1) to one
side.
2310RA150 TG
1
: Lift the contact spring (1) a little
and ease it over the tab (arrow).
: Ease the contact spring (1) out of
the guides in the filter base (2).
: Push the sleeve (1) out of the
contact spring (2).
– Check the contact spring and
replace it if necessary,
2310RA151 TG
1
2
2310RA423 TG
2
1
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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