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Stihl MS 251 Manual

Stihl MS 251
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98 MS 231, MS 231 C, MS 251, MS 251 C
: The bore (arrow) in the intake
manifold (1) must be clear, clean
if necessary – a dirty bore can
cause engine running problems,
b 3.7
: Push the throttle rod (1) into the
guide (arrow) until it snaps into
position.
: Push the washer (1) into position.
Reassemble all other parts in the
reverse sequence.
2310RA292 TG
1
2310RA287 TG
1
2310RA286 TG
1
12.9 Intake Manifold
A damaged intake manifold can
result in engine running problems.
Troubleshooting, b 3.6 or
b 3.7
Remove the shroud, b 6.4
Remove the carburetor, b 12.5
Remove the carburetor carrier,
b 12.8
Remove the air guide shroud,
b 12.4
Models with manual fuel pump,
b 12.4.1
: Take out the screws (arrows).
: Remove the intake manifold (1).
Inspect the intake manifold and
replace it if necessary – even
very minor damage can cause
engine running problems, b 3.7
2310RA357 TG
1
: Inspect and clean the sealing
faces (arrows), b 14
The sealing faces must be in perfect
condition. Always replace
components with damaged sealing
faces.
The bore (1) in the intake
manifold (2) must be clear, clean if
necessary – a dirty bore can cause
engine running problems, b 3.7
2310RA358 TG2310RA359 TG
1
2
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Stihl MS 251 Specifications

General IconGeneral
Idle speed2800 RPM
Motor type2-stroke motor
Chain pitch1/308 \
Blade length450 mm
Product colorBlack, Grey, Orange
Motor speed (max)10000 RPM
Oil tank capacity0.2 L
Fuel tank capacity0.39 L
Engine displacement45.6 cm³
Kickback protectionYes
Engine power3 hp
Power sourceGasoline
Sound power level114 dB
Vibration emission3.9 m/s²
Sound pressure level103 dB
Weight and Dimensions IconWeight and Dimensions
Weight4900 g

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