Stihl MS 171 Technical Information page 9

Technical Information 27.2013
6.4.2 MS 211
To adapt to the modified geometry of the intake
ports of the new cylinder (see b 7), the previous
manifold 1139 140 2500 is 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).
1139 140 2500-X
Left: previous manifold 1139 140 2500
Right: new manifold 1139 140 2502
Spare parts/service notes
The new manifold 1139 140 2502 cannot be used
for versions with a previous cylinder.
The previous manifold 1139 140 2500 cannot be
used for versions with a new cylinder.
The previous manifold 1139 140 2500 remains
available as a spare part.
For the new carburetors, the new manifold
1139 140 2502 is required.
TI_27_2013_30_01_01.fm
1139 140 2502-X
6.5 Sleeve
The previous sleeve 1139 141 1801 is replaced by
the new sleeve 1139 141 1802.
Left: previous sleeve 1139 141 1801
Right: new sleeve 1139 141 1802
The new sleeve (1) 1139 141 1802 is conical and is
secured to the new carburetors.
1
Spare parts/service notes
The new sleeve 1139 141 1802 can only be used in
conjunction with the new carburetors.
The new carburetors are supplied as spare parts
with the new sleeve 1139 141 1802.
The previous sleeve 1139 141 1801 remains
available as a spare part for versions with the
previous carburetor.
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