Stihl MS 251 Manual

2 MS 231, MS 231 C, MS 251, MS 251 C
Contents
12.6 Servicing
the Carburetor 90
12.6.1 Metering Diaphragm 90
12.6.2 Inlet Needle 90
12.6.3 Pump Diaphragm 91
12.6.4 Lever on
Throttle Shaft 92
12.6.5 Adjusting Screws 93
12.7 Adjusting
the Carburetor 95
12.7.1 Basic Setting 95
12.7.2 Standard setting 96
12.8 Carburetor Carrier 97
12.9 Intake Manifold 98
12.10 Tank Vent 99
12.10.1 Testing 99
12.10.2 Removing and
Installing 100
12.11 Fuel Intake 101
12.11.1 Pickup Body 101
12.11.2 Fuel Hose 101
12.11.3 Fuel Hoses –
Manual Fuel Pump 105
12.11.4 Manual Fuel Pump 107
12.11.5 Tank Housing 108
13. Special
Servicing Tools 110
14. Servicing Aids 112
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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