Stihl MS 251 Manual

85MS 231, MS 231 C, MS 251, MS 251 C
12.4.1 Air Guide Shroud –
Models with Manual Fuel
Pump
– Remove the fan housing, b 8.2
– Pull the filter base off the studs
and put it to one side with the
wiring harness still attached,
b 12.3
– Remove the carburetor, b 12.5
– Pull the boot off the spark plug.
: Pull the wiring harness and
rubber grommet (1) out of the
guides (arrows).
– Put the wiring harness with filter
base to one side.
– Remove the throttle rod,
b 10.3.4
– Remove the carburetor carrier,
b 12.8
2310RA332 TG
1
: Take out the screw (1).
: Remove the connector (2) and
disconnect it from the fuel return
hose (3).
: Pull the fuel return hose (1) out of
the guides (arrows).
: Take out the screws (1).
2310RA333 TG
1
2
3
2310RA334 TG
1
2310RA335 TG
1 1
: Push the grommet (arrow) of the
fuel hose (1) downwards and out.
: Ease the air guide shroud (1)
over the stop (arrow) and lift it a
little.
: Push the manifold flange (1) out
of the air guide shroud (2) in the
direction of the cylinder and pull
the air guide shroud away at the
same time.
2310RA336 TG
1
2310RA337 TG
1
2310RA338 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