Stihl MS 251 Manual

10 MS 231, MS 231 C, MS 251, MS 251 C
Condition Cause Remedy
QuickStop Super
Coasting brake does not disengage
even though lockout lever is
depressed
Brake cable stretched Readjust brake cable
Brake cable disconnected or
broken
Reconnect or replace brake cable
QuickStop Super
Coasting brake does not disengage
properly even though lockout lever
is depressed
Too much free travel on lockout
lever
Adjust brake cable
QuickStop Super
Braking action of coasting brake
inadequate – lockout lever not
depressed
Brake cable overtensioned Adjust brake cable
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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