Stihl MS 251 Manual

77MS 231, MS 231 C, MS 251, MS 251 C
Models with manual fuel pump
: Remove the fuel hose (1).
All models
: Carefully pull the carburetor (1)
off the studs – take care not to
overstretch the fuel hose (2).
– Put the carburetor with fuel hose
still attached to one side.
: Pry the throttle rod (1) out of the
carburetor carrier (2).
2310RA199 TG
1
2
2310RA200 TG
1
2
1
2310RA293 TG
: Pass the throttle cable (1)
through the opening (arrow) in
the direction of the rear handle.
– Check the throttle rod and
replace if necessary
Installing
: Pass the throttle cable (1)
between tank and engine
housings and through the
opening (arrow) in the direction
of the rear handle.
: Push the throttle rod (1) into the
guide (2) in the carburetor carrier
until it snaps into position.
1
2310RA294 TG
1
2310RA295 TG
2
1
2310RA296 TG
– Install the throttle trigger, b 10.2
: Push the carburetor (1) with fuel
hose (2) over the studs
– take care not to overstretch the
fuel hose (2).
Models with manual fuel pump
: Fit the new fuel hose (1).
All models
– Install the filter base, b 12.3
– Check operation
– the throttle lever on the
carburetor must move upwards
when then throttle trigger is
pulled.
– Reassemble all other parts in the
reverse sequence.
2
2310RA297 TG
1
2310RA298 TG
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