Stihl MS 251 Manual

109MS 231, MS 231 C, MS 251, MS 251 C
: Insert and tighten down the
screw (1) firmly.
: Pass the fuel hose (1) upwards
through the opening (arrow) and
into the engine housing.
Models with manual fuel pump
: Pass the fuel return hose (1)
upwards through the
opening (arrow) and into the
engine housing.
2310RA232 TG
1
2310RA386 TG
1
2310RA402 TG
1
Machines with QuickStop Super
: Push the brake cable (1), short
hook (4) first, passed the right-
hand side of the fuel hose (3) and
through the opening (arrow).
Models with manual fuel pump
: Push the brake cable (1), short
hook (4) first, passed the right-
hand side of the fuel hose (3) and
the fuel return hose (2) and
through the opening (arrow).
Machines with QuickStop Super
: Push the brake cable (1), short
hook (2) first, through the
bore (arrow) in the engine
housing.
3
1
4
2310RA058 TG
2
1
2310RA415 TG
2
All models
: Fit the antivibration spring (1) in
the recess (arrow) in the engine
housing.
– Install the handlebar, b 9.4
: Lift the tank housing (2).
: Insert and tighten down the
screw (1) firmly.
– On models with QuickStop
Super, connect the brake cable to
the brake lever, b 5.4.2
– Install the air guide shroud,
b 12.4
Models with manual fuel pump,
b 12.4.1
– Reassemble all other parts in the
reverse sequence.
2310RA416 TG
1
2310RA417 TG
1
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