Stihl MS 251 Manual

73MS 231, MS 231 C, MS 251, MS 251 C
: Push leg (1) of torsion spring in
direction of rear handle.
: Push the lockout lever (2) into its
mounts (arrow).
: Attach the torsion spring (1) to
the lockout lever (arrow).
The lockout lever may pop out.
: Engage lugs (2) at front end of
handle molding (1)
in the recesses (arrow).
– Push down the handle
molding (1) until it snaps into
position.
2
2310RA172 TG
1
2310RA173 TG
1
2310RA174 TG
1 2
– Check operation
– Reassemble all other parts in the
reverse sequence.
10.3 Throttle Trigger/Lockout
Lever – QuickStop Super
Lubricate sliding and bearing points
with grease after disassembly.
: To remove the handle molding,
press the tabs (1) on the
underside apart and push them
through the rear handle.
: Remove the handle molding (1).
5902RA307 TG
1
1
2310RA175 TG
1
: Take the throttle rod (1) out of the
guide (arrow) and disconnect it
from the throttle trigger (2).
: Use a drift (2) to drive out the
pin (1).
: Remove the throttle trigger (1)
with torsion spring (2).
– Check that roller on throttle
trigger turns freely, replace
trigger if necessary.
– Check torsion spring and replace
if necessary.
2
2310RA176 TG
1
1
2310RA177 TG
2
1
2310RA178 TG
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