Name: Stihl MS 181
Brand: Stihl
Rating: 5 (1 reviews)

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16 MS 171, MS 181, MS 211

Condition Cause Remedy

Engine speed drops quickly under

load – low power

Air filter dirty Clean the air filter

Throttle shutter not opened fully Check throttle rod

Tank vent faulty Replace tank vent

Fuel pickup body dirty Install new pickup body

Fuel strainer dirty Clean fuel strainer in carburetor,

replace if necessary

Leak in fuel line between tank and

fuel pump

Install new fuel line

Setting of high speed screw (H) too

rich

Check basic carburetor setting,

correct if necessary

Main jet bores or ports blocked Clean the carburetor

Pump diaphragm damaged or

fatigued

Fit new pump diaphragm

Engine running extremely rich, no

power and very low maximum

speed

Air valve does not open Check lever on air valve and

replace if necessary

Engine running too rich, low power

and low maximum speed

Air valve does not open fully in full

throttle position

Check lever on air valve and

replace if necessary

Erratic idle – too lean Air valve does not close properly Check lever on air valve and

replace if necessary

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