Stihl 4170 · Section A · 1 of 14 · 31 parts
Crankcase
Fits FS 25-4, FS 65-4.
This drawing carries 2 bore sizes — Ø 33 mm , Ø 39 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.
Parts (31)
| Pos | Part number | Description | Qty |
|---|---|---|---|
| 1 | 4170 020 2101 | Crankcase | 1 |
| 1 | 4170 020 2100 | Crankcase | 1 |
| 1 | 4170 020 2112 | Crankcase | 1 |
| 2 | 9022 341 1010 | Spline screw IS-M5x18 | 6 |
| 3 | 4170 021 1100 | Cover | 1 |
| 4 | 9022 341 1120 | Spline screw IS-M5x58 | 4 |
| 5 | 4170 141 4100 | Diaphragm | 1 |
| 6 | 4170 141 2400 | Support plate | 1 |
| 7 | 4170 141 8100 | Screw | 1 |
| 8 | 4170 007 1002 | Crankshaft with flywheel | 1 |
| 9 | 4170 030 0403 | Crankshaft | 1 |
| 10 | 4170 030 2001 | Piston Ø 33 mm | 1 |
| 11 | 4170 034 3050 | Set of piston ring | 1 |
| 12 | 4170 034 1500 | Piston pin | 1 |
| 13 | 4170 400 1201 | Flywheel | 1 |
| 14 | 4170 007 1003 | Crankshaft with flywheel | 1 |
| 15 | 4170 030 0413 | Crankshaft | 1 |
| 16 | 4170 030 2011 | Piston Ø 39 mm | 1 |
| 17 | 4170 034 3055 | Set of piston ring | 1 |
| 18 | 4170 034 1510 | Piston pin | 1 |
| 19 | 4170 400 1211 | Flywheel | 1 |
| 20 | 4170 021 5600 | Sealing ring | 2 |
| 20 | 4170 021 5600 | Sealing ring | 1 |
| 21 | 4170 021 5601 | Sealing ring | 1 |
| 22 | 4170 029 0505 | Gasket | 1 |
| 23 | 4170 028 0300 | Dipstick | 1 |
| 24 | 4170 038 0700 | Washer | 1 |
| 25 | 4170 038 0300 | Screw | 1 |
| 26 | 4170 400 7000 | Spark plug | 1 |
| 27 | 4170 021 3702 | Guard | 1 |
| 28 | 9022 313 0650 | Spline screw IS-M4x10 | 2 |
Parts are not interchangeable across engine series — check yours before ordering.
Wrong number or missing part for the FS 25-4, FS 65-4? Report a correction →