Stihl MS 251 Manual

37MS 231, MS 231 C, MS 251, MS 251 C
: Use a drift (2) to drive out the
screw (1).
Installing
: Use a drift (2) to drive home the
screw (1).
– Reassemble all other parts in the
reverse sequence.
1
2310RA089 TG
2
1
2310RA090 TG
2
6.5 Engine
The complete engine has to be
removed before removing the piston
or cylinder.
All sealing faces must be in perfect
condition. If the sealing faces are
damaged, replace the part
concerned, b 3.7.
– Remove the shroud, b 6.4
– Pull off the boot and unscrew the
spark plug, b 4
– Remove the fan housing,
b 8.2
– Remove the flywheel, b 7.6
– Remove the clutch, b 4
– Remove the oil pump, b 11.3
– Remove the filter base, b 12.3
– Remove the carburetor, b 12.5
– Remove the carburetor carrier,
b 12.8
– Remove the air guide shroud,
b 12.4
2310RA091 TG
– Remove the muffler, b 6.1
– Remove the handlebar, b 9.4
– Remove the tank housing,
b 12.11.5
: Remove the retaining ring (1).
: Remove the screws (1) from the
underside of the machine.
2310RA083 TG
1
1
2310RA092 TG
1
1
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