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Stihl MS 271 Manual

Stihl MS 271
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15MS 271 C, MS 291 C
3.6 Carburetor
Condition Cause Remedy
Carburetor floods; engine stalls Inlet needle not sealing
– foreign matter in valve seat or
cone
Remove and clean the inlet needle,
clean the carburetor
Inlet needle worn Replace the inlet needle
Inlet control lever sticking on
spindle
Check the inlet control lever and
replace if necessary.
Helical spring not located on nipple
of inlet control lever
Remove the inlet control lever and
refit it correctly
Perforated disc on diaphragm is
deformed and presses constantly
against the inlet control lever
Fit a new metering diaphragm
Metered diaphragm deformed Fit a new metering diaphragm
Poor acceleration Setting of low speed screw too lean Check basic carburetor setting,
correct if necessary
Setting of high speed screw too
lean
Check basic carburetor setting,
correct if necessary
Inlet needle sticking to valve seat Remove inlet needle, clean and
refit
Diaphragm gasket leaking Fit new diaphragm gasket
Metering diaphragm damaged or
shrunk
Fit a new metering diaphragm
Tank vent faulty Replace tank vent
Leak in fuel hose from tank to
carburetor
Seal connections or install new fuel
hose
Engine loses power during
acceleration
Sealing ring or spring in accelerator
pump worn or damaged
Install new carburetor

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Stihl MS 271 Specifications

General IconGeneral
Motor type2-stroke motor
Chain gauge1.6 mm
Chain pitch3/8 \
Blade length400 mm
Automatic oilingYes
Oil tank capacity0.24 L
Fuel tank capacity0.5 L
Engine displacement55.5 cm³
Engine power3.8 hp
Power sourceGasoline
Weight and Dimensions IconWeight and Dimensions
Weight5600 g

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