STIHL Parts & Spec Guide Unofficial
← MS 231 · 241 · 251

Stihl 1143 · Section B · 2 of 14 · 26 parts

Cylinder, Muffler

Fits MS 231, MS 231 C, MS 251, MS 251 C.

This drawing carries 2 bore sizes — Ø 41.5 mm = 40.6 cc (MS 231 / 231 C-BE), Ø 44 mm = 45.6 cc (MS 251, MS 251 C-BE / Wood Boss). Not interchangeable — measure your cylinder before ordering.

Position —

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Parts (26)

PosPart numberDescriptionQty
1 1143 020 1201 Cylinder with piston Ø 41.5 mm — MS 231 / 231 C-BE 1
2 1143 020 1203 Cylinder with piston Ø 44 mm — MS 251, MS 251 C-BE / Wood Boss 1
3 1143 030 2005 Piston Ø 41.5 mm — MS 231 / 231 C-BE 1
4 1143 034 3001 Piston ring Ø 41.5x1.2 mm — MS 231 / 231 C-BE 2
5 1143 034 1500 Piston pin 10x8x27.88 1
6 9463 650 1000 Snap ring 10 2
7 1143 030 2007 Piston Ø 44 mm — MS 251, MS 251 C-BE / Wood Boss 1
8 1143 034 3003 Piston ring Ø 44x1.2 mm — MS 251, MS 251 C-BE / Wood Boss 2
9 9512 003 2331 Needle cage 10x14x12.5 1
10 9075 478 4197 Pan head self-tapping screw IS-D5.3x43 4
11 1143 140 2500 Manifold 1
12 9075 478 3012 Pan head self-tapping screw IS-D4x12 3
13 1143 030 0401 Crankshaft 1
14 9503 003 0340 Grooved ball bearing 6202 → replaced by 9503 003 0346 TI 6/2001 2
15 9639 951 1584 Oil seal 15x25x5 2
16 9638 003 1581 Oil seal 15x25x5 2
17 9468 621 1520 Circlip 15x1 1
18 1143 021 2501 Engine pan 1
19 1143 149 0601 Muffler gasket 1
20 1143 140 0651 Muffler 1
21 1143 140 0653 Muffler 1
22 1135 145 9002 Plug 2
23 1143 140 8103 Spark arresting screen 1
24 9039 475 0656 Self-tapping screw M4x9.6 1
25 9022 341 0983 Spline screw IS-M5x16 2
26 0783 830 2000 Tube of sealant Dirko HT red option 1

2012 service parts catalogue. Parts are not interchangeable across engine series — check yours before ordering.

Wrong number or missing part for the MS 231, MS 231 C, MS 251, MS 251 C? Report a correction →