Stihl MS 251 Manual

88 MS 231, MS 231 C, MS 251, MS 251 C
: Push the rubber grommet (1) into
its seat until it is flush with the
edge of the air guide shroud.
: Push the short circuit wire (2) and
ground wire (3) into the
guides (arrows) – position short
circuit wire under the ground
wire.
– Install filter base with wiring
harness, b 12.3
– Reassemble all other parts in the
reverse sequence.
12.5 Carburetor
– Pull the filter base off the studs
and put it to one side with the
wiring harness still attached,
b 12.3
– Open the fuel tank cap and drain
the fuel tank.
– Collect the fuel in a clean
container, b 1
Disconnect the fuel hose only when
the tank cap is open.
2310RA350 TG
1
2
3
: Pull the fuel hose (1) off the
nipple (arrow).
Models with manual fuel pump
: Remove the fuel hose (1).
All models
: Remove the carburetor (1).
– Check the carburetor and service
or replace if necessary.
– Install a new fuel hose,
b 12.11.2
2310RA351 TG
1
2310RA199 TG
1
2310RA352 TG
1
Models with manual fuel pump
– Install new fuel intake hose,
b 12.11.3
Installing
Make sure the washer (1) is in
place.
Make sure the ring (1) is in place.
Make sure sealing ring (2) is in
place.
– Check the components and
replace as necessary.
Stub (3) must engage bore in
manifold flange.
2310RA286 TG
1
2310RA353 TG
2
3
1
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