Stihl MS 251 Manual

23MS 231, MS 231 C, MS 251, MS 251 C
: Push the hand guard (1) with
brake lever (2) over the machine
until they are positioned against
the pivot pins (arrows).
: Lift the bearing boss of the hand
guard (1) and the brake lever (2)
a little and position them over the
pivot pins (arrows).
: Push the flat spring (1) slightly to
one side until the cam of the hand
guard (arrow) slips passed it.
2310RA024 TG
1
2
2310RA025 TG
1
2
2310RA026 TG
1
– Push the hand guard bearing
boss and the brake lever on to
the pivot pins.
: Fit the retaining ring (1).
The turns of the brake spring must
be tightly against one another in the
relaxed condition. If this is not the
case, replace the brake spring.
– If the groove in the brake spring's
anchor pin is worn, install a new
engine housing, b 6.6
2310RA027 TG
1
2310RA028 TG
: Hook the brake spring (1) to the
brake lever (arrow).
: Use the assembly tool (2)
1117 890 0900 to attach the
brake spring (1) to the anchor
pin (arrow).
– Lubricate the brake lever, flat
spring and slot in hand guard,
b 14
– Reassemble all other parts in the
reverse sequence.
TOP
2310RA029 TG
1
TOP
2310RA030 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