Stihl MS 251 Manual

94 MS 231, MS 231 C, MS 251, MS 251 C
: Screw the puller (1)
5910 890 4502 about 5 turns
counterclockwise into the limiter
cap – left-hand thread.
Do not turn the puller any further
– the high speed screw (H) may
otherwise be damaged.
: Pull out the limiter cap (1).
– Take out the high speed screw
(H).
Always install a new limiter cap.
1
2310RA277 TG2310RA278 TG
1
: Inspect the tip (arrow) and
O-ring (1) for damage or wear
and replace the high speed
screw (H) if necessary.
: Screw down the high speed
screw H (1) as far as stop.
2310RA279 TG
1
2310RA280 TG
1
Pre-installing limiter cap
Always install a new limiter cap.
: Push the new limiter cap (1) on to
the high speed screw (
H) as far as
the detent (arrow)
– do not push fully home.
The basic setting is performed
through the pre-installed limiter cap
with screwdriver 5910 890 2306.
– Reassemble in the reverse
sequence.
– Carry out the basic setting,
b 12.7.1
2310RA281 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