STIHL Parts & Spec Guide Unofficial
← FS 400, FS 450, FS 480

Stihl 4128 · Section A · 1 of 21 · 27 parts

Crankcase, Cylinder

Fits FS 400, FS 450, FS 480.

This drawing carries 3 bore sizes — Ø 40 mm , Ø 42 mm , Ø 44 mm . Not interchangeable — measure your cylinder before ordering. The catalogue lists them on one sheet for one machine and never says which variant each belongs to, so this guide does not either.

Position —

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Parts (27)

PosPart numberDescriptionQty
1 4128 020 2600 Crankcase, fan side 1
2 0000 988 8600 Sleeve 4
3 9503 003 0242 Grooved ball bearing 6201 2
4 4128 020 2900 Crankcase 1
5 9640 003 1195 Oil seal 12x22x5 2
6 4128 030 0400 Crankshaft 1
7 9075 478 4175 Pan head self-tapping screw IS-D5x28 8
8 9512 003 2250 Needle cage 10x13x12.5 1
9 9512 003 2251 Needle cage 10x13x12.5 1
10 4128 029 2300 Cylinder gasket 1
11 4128 020 1201 Cylinder with piston Ø 40 mm 1
12 4128 020 1211 Cylinder with piston Ø 42 mm 1
13 4128 020 1202 Cylinder with piston Ø 44 mm 1
14 1123 030 2019 Piston Ø 40 mm 1
15 4128 030 2005 Piston Ø 42 mm 1
16 4128 030 2002 Piston Ø 44 mm 1
17 1123 034 3005 Piston ring Ø 40x1.2 mm 2
18 1123 034 3003 Piston ring Ø 42x1.2 mm 2
19 1133 034 3000 Piston ring Ø 44x1.2 mm 2
20 4119 034 1500 Piston pin 10x6.5x28 1
21 4128 034 1500 Piston pin 10x6.5x28 1
22 9463 650 1000 Snap ring 10 2
23 1110 400 7005 Spark plug Bosch WSR 6 F 1
24 4128 020 9400 Decompression valve 1
25 4128 149 0600 Muffler gasket 1
26 0783 830 2000 Tube of sealant Dirko HT red option 1
Not numbered on the diagram — assemblies, kits and options
— 4128 007 1050 Set of gaskets 1

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

Wrong number or missing part for the FS 400, FS 450, FS 480? Report a correction →