Technical Information · issue 20 of 2003
MS 200 T/ MS 200: Carburetor with limiter cap; Carburetor adjustment
IssueTI 20/2003
Engine family 1129
Part changes (3)
| Was | Becomes | What the bulletin says |
|---|---|---|
| 1129 790 1001 | 1129 790 1013 | Left: Previous version of part Right: New version of part The handle housing of the MS 200 1129 790 1001 is replaced by handle housing 1129 790 1013. |
| 1129 123 7504 | 1129 123 7507 | Grommet 1129 123 7504 is replaced by grommet 1129 123 7507. |
| 1129 123 7502 | 1129 123 7505 | Grommet 1129 123 7502 is replaced by grommet 1129 123 7505. |
Full text
Page 1 of 5
STIH)
Technical Information
20.2003
Chainsaws STIHL MS 200, 200 T – Series 1129
Contents
1. Carburetor with limiter cap
2. Carburetor adjustment
3. Grommets
4. Handle housing MS 200
5. Summary
1. Carburetor with limiter cap 1.1 Mechanical design
In order to comply with future emission standards in
Europe, the previous carburetors are being
replaced by carburetors with limiter caps.
The previous carburetor 1129 120 0650 is replaced 1
by the new version 1129 120 0651. 4
The carburetor is set to a standard setting by the 2
manufacturer.
3
This setting ensures an optimum fuel-air mixture
162TI000 KN
under almost all operating conditions.
With this carburetor, it is only possible to correct the
adjustment of the high speed screw within fine
limits. The full-load setting consequently always . Low speed adjusting screw with gasket (1)
remains in a favourable range for the engine. . High speed adjusting screw with gasket (2)
The screw can still be finely adjusted for different . Limiter cap (3)
operating conditions and areas of use, such as
. Stop pin (4)
changes in altitude (mountains, sea level).
The cap is pushed over the head of the adjusting
screw and onto the knurling. The stop on the
carburetor body limits screw rotation.
TI_20_2003_01_01_01.fm englisch / english
)m~ge 2 Technical Information 20.2003
2. Carburetor adjustment 2.2 Basic setting without limiter cap
H L
270°
162TI004 KN
162TI002 KN
The high speed screw H can only be adjusted . Starting from the tight position of the adjusting
screw:
by the user within a range of up to 270 degrees
(3/4 of a turn) on this carburetor.
H = Back off 11/8 turns
This allows the carburetor setting to be adjusted for
different operating conditions and areas of use, L = Back off 11/8 turns
such as changes in altitude (mountains, sea level).
2.1 Maintenance / repair
Set the specified speeds within the tolerance range
of +/– 200 rpm.
1. Set speed to 3700 rpm with idle speed adjusting
screw (LA)
2. Turn the low speed adjusting screw (L) clockwise
or anticlockwise to obtain the highest speed
If this speed is greater than 4000 rpm:
Stop adjustment and resume with step 1.
3. Set the speed to 3700 rpm again with the idle
162TI003 KN
speed adjusting screw (LA)
4. Set the speed to 2800 rpm with the low speed
If a faulty high speed adjusting screw has to be adjusting screw (L)
replaced or the carburetor has to be cleaned, the 5. Set the maximum speed of 14500 rpm with the
cap on the high speed adjusting screw must be high speed adjusting screw (H)
removed by the service engineer.
If the setting is too lean, the engine may be
. Remove cap with a suitable tool. damaged due to inadequate lubrication and
Caps which have been removed must never be overheating!
reused, as they are damaged when pulled off. 6. Continue as described under "Securing the cap"
Adjustment after maintenance / repair
. Check air filter Last Technical Information on
clean or replace it if necessary
. Examine spark arresting screen (if fitted) – clean
or replace it if necessary
. Check chain tension
TI_20_2003_01_01_01.fm Page 2 of 5
Technical Information 20.2003 Page 3
2.3 Securing the cap Set idle speed
Engine stops when idling
. Open low speed adjusting screw (L) 11/8 turns
. Turn idle speed adjusting screw (LA) clockwise
until chain just begins to run – then back off one
H turn
Chain runs when engine idles
. Open low speed adjusting screw (L) 11/8 turns
162TI005 KN
. Turn idle speed adjusting screw (LA)
anticlockwise until chain stops – then give one
more full turn of the screw
Caps which have been removed must never be
reused, as they are damaged when pulled off.
Speed erratic when idling; poor acceleration
. Align new cap for the H screw with the stop pin
(although low speed adjusting screw = 11/8)
for the rich setting (arrow)
. Idle setting is too lean – turn low speed adjusting
. Press cap into place until it rests against the
screw (L) anticlockwise until engine runs
carburetor housing
smoothly and accelerates well
2.4 Standard setting with limiter cap .
The idle speed adjusting screw (LA) must
The limiter cap must not be removed while making usually also be adjusted whenever the low
the standard setting! speed adjusting screw (L) has been adjusted
. Switch off engine
Setting for use in mountains or at sea level
. Check air filter – clean or replace it if necessary
The carburetor setting can be marginally adjusted if
. Check spark arresting screen (if fitted) in engine performance is unsatisfactory in mountain
muffler – clean or replace it if necessary country or at sea level:
. Check chain tension . Check standard setting
. Let engine warm up
In mountain country:
H L . Turn high speed adjusting screw (H) clockwise
(leaner setting), but no further than the stop
At sea level:
. Turn high speed adjusting screw (H)
anticlockwise (richer setting), but no further than
the stop
162TI015 KN
LA
If the setting is too lean, the engine may be
damaged due to inadequate lubrication and
. Turn high speed adjusting screw (H) overheating!
anticlockwise as far as possible (max. 3/4 turn)
. Turn low speed adjusting screw (L) clockwise
onto its seat – then back off 11/8 turns
TI_20_2003_01_01_01.fm
)m~ge 4 Technical Information 20.2003
3. Grommets 4. Handle housing MS 200
3.1 MS 200
162TI014 KN
162TI013 KN
Left: Previous version of part
Right: New version of part
Left: Previous version of part
Right: New version of part
The handle housing of the MS 200 1129 790 1001 is
replaced by handle housing 1129 790 1013.
Grommet 1129 123 7504 is replaced by grommet
1129 123 7507.
3.2 MS 200 T
HL H L
3/4 1
LA LA
162TI012 KN
Left: Previous version of part
Right: New version of part
Grommet 1129 123 7502 is replaced by grommet
1129 123 7505.
TI_20_2003_01_01_01.fm Page 3 of 5
Technical Information 20.2003 Page 5
5. Summary
Item Part name Previous New Remarks
1 Carburetor C1Q-S32 1129 120 0650 --- 1)
2 Carburetor C1Q-S61; including Item 3 --- 1129 120 0651
3 Cap --- 1129 121 2701
4 Grommet MS 200 T 1129 123 7502 1129 123 7505 1)
5 Grommet MS 200 1129 123 7504 1129 123 7507 1)
6 Handle housing MS 200 1129 790 1001 1129 790 1013 1)
Modification to be introduced continuously
Remarks
1) Previous version of part remains available for older machines
Last Technical Information on STIHL MS 200: 37.2000
STIHL MS 200 T: 49.2002
© ANDREAS STIHL AG & Co. KG, 2003 Technical Documentation
D1/MTK-ru 7708
TI_20_2003_01_01_01.fm Page 4 of 5
Page 5 of 5
Extracted from the manufacturer's 2012 service catalogue. Most of these PDFs embed fonts with a shifted character map, so the text above was recovered rather than copied — read it as a faithful but imperfect transcription, and treat the page image above each block as the authority where the two disagree — the figures exist only there, because they are vector drawings that text extraction cannot keep.