Stihl MS 181 User Manual

5MS 171, MS 181, MS 211
3. Specifications
3.1 Engine
MS 171 MS 181, MS 181 C MS 211, MS 211 C
Displacement: 30.1 cm
3
31.8 cm
3
35.2 cm
3
Bore: 37 mm 38 mm 40 mm
Stroke: 28 mm 28 mm 28 mm
Engine power to ISO 7293: 1.3 kW (1.8 PS)
at 9,500 rpm
1.5 kW (2.0 PS)
at 9,500 rpm
1.7 kW (2.3 PS)
at 9,500 rpm
Max. permissible engine speed
with bar and chain: 13,500 rpm 13,500 rpm 13,500 rpm
Idle speed: 2,800 rpm 2,800 rpm 2,800 rpm
Clutch: Centrifugal clutch without linings
Clutch engages at: 5,100 rpm 5,100 rpm 5,100 rpm
Crankcase leakage test
at gauge pressure: 0.5 bar
under vacuum: 0.5 bar
3.2 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
3.3 Ignition System Air gap between ignition module and
fanwheel:
0.15...0.35 mm
Spark plug (suppressed): NGK CMR 6H
Electrode gap: 0.5 mm
3.4 Chain Lubrication Fully automatic, speed-controlled oil pump with reciprocating
piston
Oil delivery rate: 7.0 cm³/min at
10,000 rpm
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Stihl MS 181 Specifications

General

Idle speed	- RPM
Motor type	2-stroke motor
Chain pitch	3/8 \
Blade length	400 mm
Product color	Black, Grey, Orange
Chain tensioner	Yes
Motor speed (max)	10000 RPM
Fuel tank capacity	0.266 L
Engine displacement	31.8 cm³
Power source	Gasoline
Sound power level	112 dB
Vibration emission	3.5 m/s²
Sound pressure level	100 dB

Weight and Dimensions

Weight	43004300 g