Stihl MS 251 Manual

22 MS 231, MS 231 C, MS 251, MS 251 C
: Remove the retaining ring (1).
: Pull the hand guard (1) and brake
lever (2) off the pivot
pins (arrows) together.
– Remove the hand guard and
brake lever.
: Remove the spacer washer (1)
and strap (2).
: Pull out the flat spring (3).
2310RA016 TG
1
2310RA017 TG
1
2
2310RA018 TG
1
2
3
: Take the brake lever (2) out of
the hand guard (1).
– Check the anchor pin – if it is
worn, install a new engine
housing.
– Check the cam on the hand
guard and replace the hand
guard if necessary.
Installing
– Clean the pivot pins and
disassembled parts, b 14
– Lubricate the pivot pins, b 14
: Push the loop of the flat spring (1)
into its seat (arrow) as far as
stop.
2310RA019 TG
21
TOP
2310RA020 TG
1
: Fit the strap (1) on the pivot
pins (2) and (3) so that "TOP"
faces outwards and the
curve (arrow) faces up.
: Slip the spacer washer (1) onto
the pin (2).
: Hold the brake lever (2) so that
the brake spring attachment
point (arrow) is at the top.
: Push the brake lever (2) into the
recess in the hand guard (1) and
line up the holes.
TOP
2310RA021 TG
1
23
2310RA022 TG
2
1
2310RA023 TG
1
2
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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