Description
Overview:
This Decompression Valve is a genuine Stihl OEM part for large professional chainsaws, including the MS 880 and MS 780. It is a metal-bodied, screw-in valve with a black push-button cap that vents cylinder pressure during starting. By reducing peak compression, it lowers the pull force needed on the recoil starter and helps prevent kick-back on start-up. Built for harsh forestry and milling environments, it withstands heat, vibration, and fuel exposure. Designed to fit the dedicated port on compatible Stihl cylinders, it restores easy starting when an old valve becomes worn or leaks. Using a genuine part maintains the correct fit, sealing, and reliability expected from high-displacement Stihl two-stroke engines.
Key Features:
- Genuine Stihl part (OEM) for assured compatibility and build quality
- Reduces engine compression for easier, safer cold and hot starts
- Durable metal construction with a robust push-button release
- Simple screw-in replacement using the existing cylinder port
- Helps reduce pull-cord effort and starter wear on big-bore saws
- Reliable sealing to prevent compression loss during operation
- Built to handle heat, vibration, and fuel/oil exposure in daily use
- Suitable for frequent users and professional forestry applications
Typical Applications:
Ideal for restoring or maintaining easy starting on high-displacement Stihl chainsaws used for felling, logging, milling, and storm clearance. Useful where repeated starts are required across a workday, helping reduce operator effort and strain on the starter system. A practical maintenance part for both trade and serious DIY users running large two-stroke saws.
Also known as:
Decompressor, decompression button, pressure relief valve, pressure release valve, engine decompressor valve, cylinder decompression valve, start-assist valve, chainsaw decompressor.
Fits Models:
MS 381, MS 382, MS 651, MS 661, MS 661 C, MS 780, MS 880, MS 881
Alternate Part Numbers:
1124-020-9401, 11240209401
Product Specifications
| L&S Part No. | 1124 020 9401 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 11240209401 |
| Unit of Sale | 1 |
| Machine Type | Chainsaws |
| Fits Brands | Stihl |
| Key Features | - Genuine Stihl OEM part ensures compatibility with specified models - Reduces engine compression for easier starting - Durable metal construction with push-button release - Fits dedicated port on Stihl cylinders - Withstands heat, vibration, and fuel exposure |
| Fits Models | MS381 | MS382 | MS651 | MS661, MS661C | MS780 | MS880 | MS881 |
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