Technical Information · issue 8 of 2004

New Basic Carburetor Setting

Model MS 200, MS 200 T Chainsaws – Series 1129

IssueTI 8/2004

Engine family 1129

Full text

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STIH)

Technical Information

08.2004

Model MS 200, MS 200 T Chainsaws – Series 1129

New Basic Carburetor Setting Basic Setting without Limiter Cap

The basic setting of the carburetor 1129 120 0651
on models MS 200 and MS 200 T has been
changed to further improve operation.

H L
Service Note

In the case of a service replacement of the
carburetor 1129 120 0651 on an MS 200, the high
speed screw must be corrected to H = 1 1/4.

162TI004 KN

. Starting with the adjusting screw firmly against
its seat:

MS 200

New: Open H = 1 1/4 turns
Open L = 1 turn
Before: H = 1 1/8; L = 1 1/8

MS 200 T
New: Open H = 1 turn
Open L = 1 turn
Before: H = 1 1/8; L = 1 1/8

TI_08_2004_01_01_01.fm englisch / English
)m~ge 2 Technical Information

Standard Setting with Limiter Cap
Adjust the specified engine speeds within a
tolerance range of +/- 200 rpm. The limiter caps must not be removed for the
standard setting.
1. Use idle speed screw (LA) to set engine . Shut off the engine.
speed to 3,700 rpm . Check the air filter and clean or replace as
necessary.
2. Rotate the low speed screw (L) clockwise or
. Check the spark arresting screen (if fitted) in the
counterclockwise to obtain maximum engine
muffler and clean or replace as necessary.
speed
. Check chain tension.

If this engine speed is higher than 4,000 rpm, abort

the adjustment and start again with step 1.

3. Use idle speed screw (LA) to set engine H L

speed to 3,700 rpm once again

4. Use low speed screw (L) to set engine speed

to 2,800 rpm

5. Use high speed screw (H) to set maximum fo

162TI015 KN
LA
engine speed to 14,500 rpm
If the setting is too lean, there is a risk of damaging . Rotate the high speed screw (H) counter-
the engine as a result of insufficient lubrication and clockwise as far as stop (max. 3/4 turn).

overheating.
. Rotate the low speed screw (L) clockwise as far
as stop. Then turn it back one full turn.

Securing the Limiter Cap

H
lin 162TI005 KN

Do not re-install the used cap since it is damaged
during removal.
. Fit the new limiter cap on the H screw, lining it
up with the rich stop (arrow).
. Push on the cap until it butts against the
carburetor body.

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Technical Information Page 3

Adjusting Idle Speed Fine tuning for operation at high altitude
Engine stops while idling A slight correction of the setting may be necessary
. Set the low speed screw (L) so that it is one full if the engine does not run satisfactorily.
turn open. . Check the standard setting.
. Turn the idle speed screw (LA) clockwise until . Warm up the engine.
the chain begins to run, then turn the screw back
. Turn the high speed screw clockwise (leaner),
one full turn from that position.
but no further than stop.
If the setting is too lean, there is a risk of damaging
Chain runs when engine is idling the engine as a result of insufficient lubrication and
. Set the low speed screw (L) so that it is one full overheating.

turn open.
. Turn the idle speed screw (LA) counter-
clockwise until the chain stops running – then

turn screw another full turn in the same
direction.

Erratic idling behavior, poor acceleration
(even though low speed screw = 1)
. Idle setting is too lean.
Turn the low speed screw (L) counterclockwise
until the engine runs and accelerates smoothly.
. It is usually necessary to change the setting of
the idle speed screw (LA) after every correction

to the low speed screw (L).

Last Technical Information on STIHL MS 200: 20.2003
STIHL MS 200 T: 44.2003

TI_08_2004_01_01_01.fm

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