Stihl MS 251 Manual

51MS 231, MS 231 C, MS 251, MS 251 C
: Pull out the grommet (1) with
wiring harness.
: Take the short circuit wire (1) out
of the guides (arrows).
: Pry the terminal sleeve (1) out of
the guide (arrow).
: Remove the Master Control
lever (2).
2310RA134 TG
1
2310RA135 TG
1
2310RA136 TG
1
2
Installing
The protective tube (1) must locate
in the grommet's bore.
: If necessary, push the wiring
harness into the grommet until
the protective tube (1) locates in
the grommet (2).
: Position the wiring harness (1) so
that the protective tube (2) points
towards the ignition module.
2310RA137 TG
1 2
2
2310RA138 TG
1
: Push the grommet (1) into the
recess (arrow) in the air guide
shroud (2) until it is flush with the
outside edge.
The ground wire (1) must be below
the short circuit wire (2).
: Position the wiring harness (1) in
the retainer (2) so that about 5
mm (a) of the protective tube (3)
is held as shown – the protective
tube must be pushed into the
grommet as far as stop.
2
2310RA139 TG
1
2310RA140 TG
2
1
2310RA141 TG
2
3
1
a
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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