Stihl MS 291 User Manual

2 MS 271 C, MS 291 C
Contents
12. Fuel System 80
12.1 Air Filter 80
12.2 Baffle 80
12.3 Filter Base 80
12.4 Air Guide Shroud 82
12.4.1 Air Guide Shroud –
Models with
Manual Fuel Pump 82
12.5 Carburetor 84
12.5.1 Leakage Test 85
12.6 Servicing the
Carburetor 86
12.6.1 Metering Diaphragm 86
12.6.2 Inlet Needle 86
12.6.3 Pump Diaphragm 87
12.6.4 Levers on
Throttle Shaft 88
12.6.5 Adjusting Screws 89
12.7 Adjusting the
Carburetor 90
12.7.1 Basic Setting 90
12.7.2 Standard setting 92
12.8 Carburetor Carrier 92
12.9 Intake Manifold 94
12.10 Tank Vent 95
12.10.1 Testing 95
12.10.2 Removing and
Installing 95
12.11 Fuel Intake 96
12.11.1 Pickup Body 96
12.11.2 Fuel Hose 96
12.11.3 Fuel Hose –
Models with Manual
Fuel Pump 99
12.11.4 Manual Fuel Pump 102
12.11.5 Tank Housing 103
13. Special Servicing
Tools 106
14. Servicing Aids 108

Stihl MS 291 Specifications

General

Engine Power	2.8 kW
Displacement	55.5 cm³
Weight	5.6 kg
Vibration Level (left/right)	4.5/4.5 m/s²
Guide Bar Length	16 in to 20 in
Fuel Tank Volume	460 ml
Chain Pitch	3/8"
Fuel Capacity	500 cc