Stihl MS 251 Manual

97MS 231, MS 231 C, MS 251, MS 251 C
12.8 Carburetor Carrier
– Disconnect the filter base from
the rubber buffers and put it to
one side.
– Remove the carburetor and put it
to one side, b 12.5
: Remove the shim (1).
: Pull the throttle rod (1) out of the
guide (arrow) and put it to one
side.
2310RA073 TG
1
2310RA287 TG
1
: Push the manifold flange (1) out
of the carburetor carrier (2) in the
direction of the cylinder, pulling
the carburetor carrier away at the
same time.
– Remove the carburetor carrier,
check it and replace if necessary.
– Check the intake manifold and
replace if necessary, b 12.9
Installing
: To fit the manifold (2) through the
carburetor carrier's opening, wind
a piece of string (1) (about 15 cm
long) around the back of manifold
flange.
2310RA288 TG
1
2
2310RA289 TG
1
2
– Coat manifold flange with STIHL
press fluid, b 14
: Use the ends of the string (2) to
pull the manifold flange (1)
through the intake opening while
pushing the carburetor carrier (3)
against the manifold flange.
– Remove the string.
: Position the carburetor carrier (1)
so that the semi-circles (arrows)
locate against the studs (2).
2310RA290 TG
1
2
3
2310RA291 TG
1
2
2
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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