Stihl MS 171, 1139 Series, MS 211, MS 181 Technical Information

STIH)

Technical Information

TI_27_2013_30_01_01.fm

englisch / English

Chain saws STIHL MS 171, 181, 211 – Series 1139

Contents

1. Technical description

2. Handle frame

3. Starters

4. Muffler

5. Ignition module, wiring harness, contact spring

6. Carburetor, manifold, sleeve

7. Cylinder with piston (MS 211 only)

1. Technical description

To improve function, new components are
introduced for the chain saws MS 171, 181 and 211.

2. Handle frame

Handle frame for standard versions

The previous handle frame 1139 791 4900 is being
replaced by the new handle frame 1139 791 4903.

Handle frame for Easy2Start™ versions

The previous handle frame 1139 791 4901 is being
replaced by the new handle frame 1139 791 4904.

Both new handle frames differ from the previous
handle frames by a stub (2) that is in the opening on
the engine housing. The new handle frames and
stub (2) reduce the load on the AV spring (3), which
is why the retainer (1) 1139 790 8100 is no longer
installed on the new handle frames.

Left: previous handle frames:

Handle frame (Standard) 1139 791 4900
Handle frame (Easy2Start™)
1139 791 4901

Right: new handle frames:

Handle frame (Standard) 1139 791 4903
Handle frame (Easy2Start™)
1139 791 4904

3 3

2

533TI025 KN

1

27.2013

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Spare parts/service notes

The previous handle frames 1139 791 4900 and
1139 791 4901 are no longer available as spare
parts.

The new handle frames 1139 791 4903 and
1139 791 4904 can be used for machines with the
previous handle frames.

With the new handle frames, the retainer (1)
1139 790 8100 is no longer required.

The retainer 1139 790 8100 remains available as a
spare part for machines with the previous handle
frames.

2.1 Summary – handle frames

Item Part Name Previous New Rem.

1 Handle frame (Standard) 1139 791 4900 1139 791 4903 1) 3)
2 Handle frame (Easy2Start™) 1139 791 4901 1139 791 4904 1) 3)
3 Retainer 1139 790 8100 - - - 2)

Modification to be introduced : continuously

Remarks

1) Previous version of part no longer available from factory

2) Previous version of part remains available for older models

3) New version of part can also be used for older machines

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3. Starters

3.1 Easy2Start™ starter

The Easy2Start™ starter is converted from a
version with two pawls (1) to a version with one pawl
(2). The pawl does not change.

At the same time, the previous spring (3)
1128 195 3500 is replaced by the spring (4)
1118 195 3500.

Spare parts/service notes

The part number 1139 080 2103 for the
Easy2Start™ starter remains unchanged.

The previous spring 1128 195 3500 remains
available as a spare part.

3.2 Segment

The previous segment 1139 084 7800 is being
replaced by the new segment 1139 084 7802.

The new segment 1139 084 7802 has changed
geometrically and ensures a larger amount of
cooling air.

Spare parts/service notes

The new segment 1139 084 7802 can also be used
for previous versions.

The previous segment 1139 084 7800 is no longer
available as a spare part.

For MS 211 versions with a new "cylinder with piston
Ø 40 mm" 1139 020 1205, the previous segment
1139 084 7800 must not be used (see b 7).

Left: previous Easy2Start™ starter

1139 080 2103 with two pawls (1) and
previous spring (3)

Right: new Easy2Start™ starter 1139 080 2103

with one pawl (2) and a different spring (4)

21

3

1

4

533TI029 KN

Left: previous segment 1139 084 7800
Right: new segment 1139 084 7802

533TI030 KN

1139 084 7800 1139 084 7802

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3.3 Summary – starters

Item Part Name Previous New Rem.

1 Fan housing with starter;

including Item 5

1139 080 2102 - - - 1)

2 Fan housing with starter;

including Item 6

- - - 1139 080 2102 3)

3 Fan housing with starter (Easy2Start™);

including Items 5, 7

1139 080 2103 - - - 1)

4 Fan housing with starter (Easy2Start™);

including Items 6, 8

- - - 1139 080 2103 3)

5 Segment 1139 084 7800 - - - 1)
6 Segment - - - 1139 084 7802 3)
7 Spring 1128 195 3500 - - - 2)
8 Spring - - - 1118 195 3500

Modification to be introduced : continuously

Remarks

1) Previous version of part no longer available from factory

2) Previous version of part remains available for older models

3) New version of part can also be used for older machines