Description
Overview:
This Genuine Stihl decompression valve (MPN: 1128 020 9400) is a screw-in starting aid for Stihl two-stroke machines such as chainsaws and brushcutters, including the MS260 and MS360. It features a robust metal body with an integrated sealing O-ring and a spring‐loaded button. When pressed before pulling the starter cord, the valve temporarily lowers cylinder pressure to reduce pull effort. This helps protect the recoil starter and reduces strain on engine components, especially on higher-displacement engines. Designed specifically for Stihl cylinders with a decompression port, it provides a precise fit and dependable sealing for consistent performance and long service life in forestry, landscaping, and grounds maintenance work.
Key Features:
- Genuine Stihl OEM part for assured compatibility and reliability
- Reduces cylinder compression for easier cold and hot starts
- Durable metal construction with O-ring seal for gas‐tight fit
- Simple screw-in installation to the cylinder decompression port
- Helps reduce wear on starter rope, pawls and recoil assembly
- Consistent operation thanks to spring‐loaded push button mechanism
- Supports smoother starting on larger-capacity engines under load
- Direct replacement for worn or leaking valves to restore starting performance
- Engineered to integrate with Stihl ignition and fuel systems without adjustment
Typical Applications:
Used on Stihl chainsaws and brushcutters to ease starting during forestry work, arborist tasks, firewood processing, site clearance, heavy brush cutting, and stone/concrete cutting with compatible models. Ideal when servicing machines that are hard to start, have high compression, or show starter rope wear, restoring reliable day‐to‐day operation.
Also known as:
Decompression button, decomp valve, compression release valve, pressure release valve, start assist valve, engine decompressor, cylinder pressure relief, starting aid valve.
Fits Models:
024, 026, 036, 036 QS, 044, 046, 066, FR 350, FR 450, FR 480, FR 480 C, FS 300, FS 350, FS 380, FS 500, FS 550, FS 550 L, GS 461, MS 240, MS 260, MS 260 C, MS 360, MS 360 C, MS 381, MS 440, MS 460, MS 461, MS 650, MS 660
Alternate Part Numbers:
1128-020-9400, 11280209400
Product Specifications
| L&S Part No. | 1128 020 9400 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 11280209400 |
| Unit of Sale | 1 |
| Applications | 024, 026, 036, 036 QS, 036QS, 044, 046, 066, FR 350, FR 450, FR 480, FR 480 C, FR350, FR450, FR480, FR480C, FS 300, FS 350, FS 380, FS 500, FS 550, FS 550 L, FS300, FS350, FS380, FS500, FS550, FS550L, GS 461, GS461, MS 240, MS 260, MS 260 C, MS 360, MS 360 C, MS 381, MS 440, MS 460, MS 461, MS 650, MS 660, MS240, MS260, MS260C, MS360, MS360C, MS381, MS440, MS460, MS461, MS650, MS660 |
| Machine Type | Chainsaws, Brushcutters |
| Fits Brands | Stihl |
| Fits Models | MS260, MS260C | MS440 | MS460 | MS240 | MS360, MS360C | FS300, FS350, FS380 | FS500, FS550, FS550L | FR350, FR450, FR480, FR480C | 024 | 026 | MS461 | MS650 | MS660 | 036 | 036QS | 044 | 046 | 066 | GS461 |
