Stihl 4180 · Assembly · 1 of 18 · 38 parts

A - Engine Ø 38 mm

Fits FS 91 R-Z.

Source: 03-2025 (United States, English) · FS 91 R-Z · PDF page 2. Check this exact variant and the row remarks before ordering.

Tap a numbered callout to view that part. Use +/− or pinch to zoom. Scroll to browse.

Parts (38)

Pos	Part number	Description	Qty
1	4180 020 0204	Engine Ø 38 mm Contains item(s): 2 - 34	1
2	4180 020 1208	Cylinder with piston Ø 38 mm Contains item(s): 3 - 11	1
3	4180 025 2010	Valve	2
4	4180 025 1600	Valve spring	2
5	4180 025 3000	Spring retainer plate	2
6	4180 038 1700	Collar screw M5	2
7	4180 030 2007	Piston Ø 38 mm Contains item(s): 8 - 10	1
8	4180 034 3002	Piston ring Ø 38x1.2 mm	2
9	4137 034 1500	Piston pin 8x5x22	1
10	9463 650 0805	Snap ring 8x0.7	2
11	9075 478 4159	Pan head self-tapping screw IS-D5x24	4
12	4180 030 0410	Crankshaft	1
13	9639 003 1231	Oil seal 12x22x7	2
14	4180 021 2500	Engine pan	1
15	4180 448 1201	Lead retainer	1
16	9074 478 2970	Pan head self-tapping screw IS-P4x10	1
17	4180 141 8602	Impulse hose	1
18	4180 030 1800	Cam wheel	1
19	4180 038 0801	Pin 5x28	2
20	4180 038 1900	Cam follower	2
21	4180 038 1301	Cover	1
22	9075 478 3018	Pan head self-tapping screw IS-D4x18	4
23	4180 038 2600	Pushrod	2
24	4282 038 1000	Rocker arm	2
25	4180 038 2000	Sleeve	2
26	4180 038 2700	Lock nut M5	2
27	4180 029 0500	Gasket	1
28	4180 025 1100	Valve cover	1
29	9022 346 1070	Spline screw IS-M5x30	1
30	9636 815 0270	Sealing ring 5x9x1	1
31	4180 149 0600	Muffler gasket	1
32	4114 149 1205	Gasket	1
33	4180 129 0907	Gasket	1
34	4180 129 0900	Gasket	1
35	4180 893 6400	Setting gauge	1
36	4180 007 1036	Set of gaskets Contains item(s): 13, 27, 30 - 34	1
37	4180 007 1005	Valve clearance setting kit Contains item(s): 27, 30, 35	1
38	0783 830 2000	Sealant, Dirko HT red	1

Parts are not interchangeable across engine series — check yours before ordering.

Wrong number or missing part for the FS 91 R-Z? Report a correction →