Stihl MS 251 Manual

106 MS 231, MS 231 C, MS 251, MS 251 C
: Remove the fuel suction
hose (1), b 12.11.2
: Disconnect the fuel suction
hose (1) and fuel return hose (2)
from the nipples (arrows).
Installing
: Install the fuel suction hose (1),
b 12.11.2
2310RA395 TG
1
2310RA396 TG
1
2
2310RA397 TG
1
– Use STIHL press fluid to simplify
assembly, b 14
: Fit the grommet (1) in the
hole (arrow) in the fuel tank and
make sure it is properly seated.
: Push the connector (1) into the
fuel return hose (2) as far as stop.
Machines with QuickStop Super
: Pass the fuel return hose (1),
connector first, under the brake
cable (2).
2310RA398 TG
1
2310RA399 TG
1
2
2310RA400 TG
1
2
3
4
: Fit the connector (3) with fuel
return hose (1) between the
ribs (arrows) and push it into the
grommet (4).
The fuel return hose (1) must be
under the brake cable (2) and run to
the left as shown in the illustration.
: Pass the fuel return hose (1)
upwards through the
opening (arrow) in the engine
housing.
: Install the fuel hose (1),
b 12.11.2
2310RA401 TG
2
1
2310RA402 TG
1
2310RA403 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