Stihl MS 181 User Manual

17MS 171, MS 181, MS 211
4.7 Engine
Always check and, if necessary,
repair the following parts before
looking for faults on the engine:
- Air filter
- Fuel system
- Carburetor
- Ignition system
Condition Cause Remedy
Engine does not start easily, stalls
at idle speed, but operates normally
at full throttle
Oil seals in engine damaged Replace the oil seals
Engine leaking or damaged
(cracks)
Seal or replace the engine
Engine does not deliver full power
or runs erratically
Piston rings worn or broken Fit new piston rings
Muffler / spark arresting screen
carbonized
Clean the muffler (inlet and
exhaust), replace spark arresting
screen, replace muffler if necessary
Air filter element dirty Replace air filter element
Fuel hose severely kinked or
damaged
Fit new hose or position it free from
kinks
Tank vent faulty Check tank vent and replace if
necessary
Air valve does not open Check air valve and replace if
necessary
Engine overheating Insufficient cylinder cooling. Air
inlets in fan housing blocked or
cooling fins on cylinder very dirty
Thoroughly clean all cooling air
openings and the cylinder fins
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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