Stihl MS 251 Manual

107MS 231, MS 231 C, MS 251, MS 251 C
– Install the air guide shroud,
b 12.4.1
– Install the carburetor, b 12.5
: Push the fuel suction hose (1)
and fuel return hose (2) onto the
nipples (arrows) as far as stop.
– Check operation of manual fuel
pump, b 12.11.4
– Reassemble all other parts in the
reverse sequence.
2310RA404 TG
2
1
12.11.4 Manual Fuel Pump
– Remove the filter base, b 12.3
: Disconnect the fuel suction
hose (1) and fuel return hose (2)
from the nipples (arrows).
– Install new fuel hoses.
: Squeeze the tabs (arrows)
together and pull out the manual
fuel pump (1).
– Check the oil fuel pump and
replace if necessary.
2310RA404 TG
2
1
2310RA406 TG
1
Installing
: Position the fuel pump (1) so that
the lug (3) points towards the
recess (arrow).
: Push the fuel pump (1) into the
air guide shroud (2) until the tabs
engage.
: Push the fuel return hose (1) onto
the long nipple (2) and elbow
connector (3).
: Push the fuel suction hose (4)
onto the short nipple (5) and the
carburetor connector (6).
– Check operation
– fuel must flow when the fuel
pump is operated.
– Reassemble all other parts in the
reverse sequence.
2310RA407 TG
1
2
3
2310RA408 TG
1
6 4
2
3
5
All manuals and user guides at all-guides.com

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