Description
Overview:
This Genuine Stihl decompression valve (OEM 1124 020 9400) is a screw‐in metal valve that lowers cylinder pressure during starting, making pull starts smoother and less strenuous. Built from durable, heat‐resistant metal with a spring‐loaded internal mechanism, it is designed for long service in harsh conditions with heavy vibration. It is suitable for Stihl cut‐off saws and larger chainsaws, including the TS510 and TS760. By temporarily relieving compression, it helps reduce kickback on the starter handle, supports more consistent cold and hot starts, and can lessen wear on the recoil starter components. A precise fit for the specified Stihl machines, it restores proper starting performance when the original valve has become worn, damaged, or is leaking.
Key Features:
- Genuine Stihl part for correct fit, function, and reliability
- Robust metal construction for strength under heat and vibration
- Reduces engine compression during starting to lower pull effort
- Helps protect the recoil starter and rope from excessive strain
- Manual push-button action; closes automatically once the engine runs
- Direct replacement under OEM reference 1124 020 9400
- Designed for Stihl cut-off saws and larger chainsaws listed below
- Suitable for regular maintenance or as a like-for-like replacement
- Straightforward screw-in installation with standard workshop tools
Typical Applications:
Used during servicing or repair when hard starting, high pull resistance, or compression leakage is noticed. Common on construction sites and workshops for cut-off machines in concrete cutting, steelwork, and demolition, and on larger chainsaws for forestry and timber work. Ideal after top-end rebuilds to restore reliable, predictable starting performance.
Also known as:
Compression release valve, decompressor, decomp valve, starter aid valve, compression relief, manual decompression screw, cylinder head decompression valve.
Fits Models:
075, 076, 084, TS 510, TS 760, TS510, TS760
Alternate Part Numbers:
1124-020-9400, 11240209400
