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Stihl MS 251 Manual

Stihl MS 251
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93MS 231, MS 231 C, MS 251, MS 251 C
Installing
: Position the lever (1) so that its
hook engages the lever on the
choke shaft (arrows).
: Push the lever (1) onto the
throttle shaft (2) so that it
engages the flats on the end of
the shaft.
: Fit the retaining ring (3).
: Check operation
– lever (1) must engage
lever (4) (arrows).
Reassemble all other parts in the
reverse sequence.
2310RA272 TG
3
4
1
2
12.6.5 Adjusting Screws
Remove the carburetor, b 12.5
See also carburetor
troubleshooting, b 3.6
There are three adjusting screws on
the carburetor:
H = high speed screw (1)
L = low speed screw (2)
LA = idle speed screw (3)
If the carburetor cannot be adjusted
properly, the problem may be the
adjusting screws.
The high speed screw H has a
limiter cap, which has to be
removed before the screw is
removed.
Always install a new limiter cap.
Low speed screw
: Take out the low speed screw
L (1).
2310RA273 TG
1
3
2
2310RA274 TG
1
: Inspect the tip (arrow) and
O-ring (1) for damage or wear
and replace the low speed screw
(L) if necessary.
Screw down the low speed screw
(L) as far as stop.
Continue with the high speed
screw H.
High speed screw
The high speed screw H has a
limiter cap, which has to be
removed before the screw is
removed.
: Rotate the limiter cap until the
lug (1) is in line with the
slot (arrow).
2310RA275 TG
1
1
2310RA276 TG
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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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