Stihl MS 251 Manual

60 MS 231, MS 231 C, MS 251, MS 251 C
8.4 ErgoStart
The spring may still be under
tension and must always be
relieved before assembling.
– Pull out the starter rope until the
engine turns – this relieves spring
tension.
– Remove the fan housing and, if
necessary, the segment, b 8.2
: Remove the circlip (1).
: Remove the the washer (2) and
carrier (3).
: Pull off the spring housing (4).
: Remove the E-clips (arrows).
: Pull off the pawls (1) and remove
the torsion springs.
– Clean the seats of the pawls (1),
b 14
2310RA209 TG
3 2 1
4
2710RA165 TG
1
1
Installing
: Fit the torsion springs on the
pawls (1) – note installed
position (arrows).
: Fit the pawls (1) on the pins (2)
on the flywheel, preload the
torsion springs at the same time
and locate them against the
ribs (arrow).
: Fit the pawls (1) so that they can
move towards the center of the
flywheel as far as stop (arrow).
: Fit the E-clips (2).
533RA198 TG
1
1
5902RA581 TG
2
1
2710RA274 TG
2
1
Check operation
Pawls must move freely and be held
against the stop by the torsion
springs.
: Push the spring housing (1) over
the starter post and into the
pawls (2) – the pawls must
engage the spring housing.
: Push the carrier (1) into the
spring housing so that its
lug (arrow) engages the loop (2)
of the rewind spring.
: Fit the washer (3).
: Fit the E-clip (4).
– Do not overstretch the retaining
ring.
– Reassemble all other parts in the
reverse sequence.
2310RA210 TG
2
1
2310RA211 TG
2 1 3 4
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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