Stihl MS 251 Instruction Manual - Page 94

Adjusting Screws, removed before the screw is

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Installing 3 1 12.6.5 Adjusting Screws 1 4 - Remove the carburetor, b 12.5 - See also carburetor troubleshooting, b 3.6 2310RA272 TG 2310RA273 TG 2310RA275 TG 2 : 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. 1 2 3 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. : 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. Always install a new limiter cap. Low speed screw 1 1 : Rotate the limiter cap until the lug (1) is in line with the slot (arrow). 2310RA274 TG 2310RA276 TG : Take out the low speed screw L (1). MS 231, MS 231 C, MS 251, MS 251 C 93

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93
MS 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