Stihl MS 291 User Manual

5MS 271 C, MS 291 C
2. Specifications
2.1 Engine
MS 271 MS 291
Displacement: 50.2 cm
3
55.5 cm
3
Bore: 44.7 mm 47.0 mm
Stroke: 32.0 mm 32.0 mm
Engine power to ISO 7293: 2.6 kW (3.5 bhp)
at 9,500 rpm
2.8 kW (3.8 bhp)
at 9,500 rpm
Maximum permissible engine speed
with bar and chain: 13,000 rpm 13,000 rpm
Idle speed: 2,800 rpm 2,800 rpm
Clutch: Centrifugal clutch without
linings
Centrifugal clutch without
linings
Clutch engages at: 3,600 rpm 3,600 rpm
Crankcase leakage test
at gauge pressure: 0.5 bar
under vacuum: 0.5 bar
2.2 Fuel System
Carburetor leakage test at
gauge pressure: 0.8 bar
Operation of tank vent at
gauge pressure: 0.5 bar
Fuel: as specified in instruction
manual
2.3 Ignition System
Air gap between ignition
module and fanwheel: 0.20 (+ 0.1/- 0.05) mm
Spark plug (resistor type): NGK BPMR 7 A
Electrode gap: 0.5 mm
2.4 Chain Lubrication
Speed-controlled oil pump with reciprocating piston
Oil delivery rate: 8.0 (+/2.0) cm
3
/min
at 10,000 rpm

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