Stihl MS 251 Manual

87MS 231, MS 231 C, MS 251, MS 251 C
– Coat the grommet with STIHL
press fluid to simplify installation,
b 14
: Place the air guide shroud (1) in
position and pull the grommet of
fuel hose (2) into the bore (arrow)
until it is properly seated.
: Line up grommet (1) of fuel
hose (2) so that its straight
side (arrow) butts against the
edge of the air guide shroud.
2310RA343 TG
12
2310RA344 TG
1
2
: Use the ends of the string (2) to
pull the manifold flange (1)
through the intake opening while
pushing the air guide shroud (3)
against the manifold flange.
– Remove the string.
: Ease the air guide shroud (1)
over the stop (arrow) and push it
into its seat.
: Insert and tighten down the
screws (2) firmly.
: Push the fuel return hose (1) onto
the connector (2) as far as stop.
2310RA345 TG
1
3
2
2310RA346 TG
2
1
2
2310RA347 TG
2
1
: Position the elbow connector (1)
against the stop (arrow).
: Insert and tighten down the
screw (2) firmly.
: Starting at the elbow
connector (2), push the fuel
return hose (1) into the
guides (arrows).
– Position the fuel return hose
snugly – without a loop between
the air guide shroud and
grommet.
Do not kink or pinch the fuel return
hose.
– Install the carburetor carrier,
b 12.8
– Install the throttle rod, b 10.3.4
– Install the carburetor, b 12.5
2310RA348 TG
2
1
2310RA349 TG
2
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