Stihl MS 251 Manual

65MS 231, MS 231 C, MS 251, MS 251 C
Make sure that the rewind spring (1)
is properly seated and the outer
anchor loop is engaged on the
lug (arrow). If necessary, push the
rewind spring fully into its seat in the
fan housing.
– Secure the spring so that it
cannot pop out.
– Install the rope rotor, b 8.5
– Reassemble all other parts in the
reverse sequence.
2310RA229 TG
1
Re-installing rewind spring in
frame
As the spring seat is deeper on
models with ErgoStart, the rewind
spring can only fitted directly in the
fan housing if it is preassembled in
a frame.
If the rewind spring has popped out,
refit it in the frame as follows:
: Fit the anchor loop in its
seat (arrow) in the frame.
: Fit the rewind spring (1)
counterclockwise in the frame,
holding the windings steady in
the process.
The procedure is otherwise the
same as that for installing a new
rewind spring on models without
ErgoStart.
5902RA608 TG
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