Stihl MS 251 Manual

57MS 231, MS 231 C, MS 251, MS 251 C
Machine runs trouble-free,
no further action necessary
no
Install new ignition module
b 7.3
yes
no
– Look for fault in fuel system or
carburetor
– Check engine for leaks
– Check position of flywheel on
crankshaft,
b 6.2, b 7.6
yes
Check operation
of stop switch:
– Short circuit wire chafed?
– Function between contact spring and switch
shaft contact:
– Position "
F" = no connection
– Position "
0" = connection
– replace the wiring harness if necessary,
b 7.7.2
2
3
Powerful
spark?
Engine
runs?
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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