Stihl MS 251 Manual

63MS 231, MS 231 C, MS 251, MS 251 C
: Hold the rope rotor (1) steady.
: Pull out the twisted rope (2) with
the starter grip and straighten it
out.
: Hold the starter grip (1) firmly to
keep the rope tensioned.
: Let go of the rope rotor (2) and
slowly release the starter rope so
that it can rewind properly.
The starter grip (1) must sit firmly in
the rope guide bushing (arrow)
without drooping to one side. If this
is not the case, tension the spring
by one additional turn.
2310RA220 TG
2
1
2310RA221 TG
2
1
1
2310RA222 TG
When the starter rope is fully
extended, it must still be possible to
rotate the rope rotor another full turn
before maximum spring tension is
reached. If this is not the case,
reduce spring tension since there is
otherwise a risk of breakage.
To reduce spring tension:
Pull the rope out, hold the rope rotor
steady and take off one turn of the
rope.
– Reassemble all other parts in the
reverse sequence.
8.8 Replacing the Rewind
Spring
– Troubleshooting, b 3.4
The replacement spring, in a spring
housing, comes ready for
installation.
– Wear a face shield and work
gloves to protect your eyes and
hands from injury.
– Remove the fan housing and the
segment, b 8.2
– Relieve tension of rewind spring if
necessary and remove the rope
rotor, b 8.5
– Remove any remaining pieces of
the old rewind spring.
If the rewind spring can no longer be
properly tensioned, install a new
spring.
Even a worn rewind spring is still
pre-loaded in the installed condition.
– Place a blanket over the work
area and pull the rewind spring
out of the fan housing.
Installing new rewind spring
– Lubricate the replacement spring
with frame with a few drops of
STIHL special lubricant before
installing, b 14
: Position the replacement spring
with frame in the fan housing so
that the anchor loop (1) is above
the lug (2) and engages the
seat (arrow).
: Starting at the anchor loop, apply
suitable tool to the
recesses (arrows) and push the
rewind spring into its seat in the
fan housing – the frame slips off
during this process.
2310RA224 TG
1
2
2310RA226 TG
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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