This decompression valve is a Genuine Stihl OEM part for petrol chainsaws, designed to reduce cylinder compression during starting. Built with a robust metal body and a fuel‐resistant rubber seal, it helps the engine turn over more easily, reducing strain on the recoil starter and helping to prevent kickback on the pull cord. It is a direct replacement for the valve used on Stihl models including the MS 241 C and MS 362, providing precise fit and correct operation. The valve screws into the cylinder head at the factory‐provided port and is engineered to withstand heat, vibration and regular use in demanding environments. Part number 1143 020 9400 ensures the correct specification and compatibility for reliable, repeatable starts.

Key Features:
– Genuine Stihl OEM component for assured compatibility and performance
– Reduces engine compression to lower pull force at the starter cord
– Durable metal construction with a resilient rubber seal for reliable sealing
– Helps protect starter assemblies by reducing stress and wear during starting
– Heat, fuel and vibration resistant for long service life in tough conditions
– Direct screw‐in replacement; straightforward to fit with basic hand tools
– Supports easier cold starts and restarts across a wide range of operating conditions
– Maintains proper sealing when closed to avoid power loss during operation
– Suitable for professional users and DIY owners seeking consistent, easy starting

Typical Applications:
Used on compatible Stihl chainsaws to aid starting before felling, snedding, firewood cutting, storm clearance, and general grounds maintenance. Ideal for operators who start the saw frequently during a working day, helping to reduce fatigue and minimising wear on the recoil starter and cord. Suitable for routine servicing or as a like‐for‐like replacement of a worn or leaking valve.

Also known as:
Decompressor valve, pressure relief valve, start‐assist valve, decompression bleed valve, engine starting valve, cylinder pressure release valve.

Fits Models:
MS 241 C, MS 362, MS 362 C, MS 500 i, MS241C, MS362, MS362C, MS500i

Alternate Part Numbers:
1143-020-9400, 11430209400

Product Specifications