Stihl MS 251 Manual

105MS 231, MS 231 C, MS 251, MS 251 C
12.11.3 Fuel Hoses –
Manual Fuel Pump
– Open the tank cap.
– Remove the pickup body, b 11.1
– Remove the filter base, b 12.3
: Pull the furl suction hose (1) off
the nipples (arrows).
– Remove the carburetor, b 12.5
– Remove the carburetor carrier,
b 12.8
– Remove the air guide shroud,
b 12.4.1
– Lower the tank housing,
b 12.11.2
2310RA356 TG
1
Machines with QuickStop Super
When the tank housing is lowered,
the brake cable grommet is pulled
out of the adjusting screw – this
may change the adjustment of the
brake cable.
: Take out the screw (1) and pull
the retainer (2) out of its seat.
: Remove the fuel hose (1),
b 12.11.2.
: Pull the fuel return hose (1)
downwards and out through the
opening (arrow).
1
2
2310RA057 TG2310RA390 TG
1
2310RA391 TG
1
: Pull out the connector (1) with
fuel return hose (2).
: Pull the connector (1) off the fuel
return hose (2).
: Pry out the grommet (1).
– Replace the fuel return hose.
Check the connector and
grommet and replace if
necessary.
2310RA392 TG
12
2310RA393 TG
1
2
2310RA394 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