Page 8 Technical Information 27.2013
TI_27_2013_30_01_01.fm
6. Carburetor, manifold, sleeve
6.1 Technical description
The chain saws STIHL MS 171, 181 and 211 will be
fitted with a new carburetor as standard.
The new carburetors differ from previous
carburetors by a modified low speed adjusting
screw, high speed adjusting screw (MS 211 only)
and throttle shutter.
Together with the new carburetors, a new sleeve
and new manifold are introduced.
6.2 Overview of carburetor
The chain saws MS 181 and MS 211 are being fitted
with common carburetor versions.
The previous carburetors remain available as a
spare part for older machines.
6.3 Carburetor adjustment
The basic setting for servicing and the standard
setting for the new carburetors is the same as the
previous carburetors.
6.4 Manifold
6.4.1 MS 171, 181
The previous manifold 1139 140 2501 is being
replaced by the new manifold 1139 140 2502.
The new manifold 1139 140 2502 is marked by a
conical groove on the fuel mix duct (see arrow).
The cross-section of the clean air duct on the
manifold has been increased.
Spare parts
The new manifold 1139 140 2502 can also be used
for versions with a previous manifold
1139 140 2501.
The previous manifold 1139 140 2501 is no longer
available as a spare part.
For the new carburetors, the new manifold
1139 140 2502 is required.
Service notes
When making repairs, if the previous manifold
1139 140 2501 is replaced by the new manifold
1139 140 2502, coat the previous sleeve
1139 141 1801 with press fluid before inserting into
the manifold.
Previous New
MS 171 C1Q-S238 –
1139 120 0615
C1Q-S270 –
1139 120 0619
MS 181
C1Q-S239 –
1139 120 0616 C1Q-S269 –
1139 120 0613
MS 211
C1Q-S241 –
1139 120 0618
MS 211
C1Q-S240 –
1139 120 0617
C1Q-S268 –
1139 120 0612
Left: previous manifold 1139 140 2501
Right: new manifold 1139 140 2502
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