Description
Overview:
The Decompression Valve for Stihl TS400 (OEM Part No. 4223 020 9400) is a genuine Stihl component that eases starting on petrol cut-off saws. It features a durable metal body with a heat- and fuel-resistant sealing O-ring. During cranking it vents excess cylinder pressure, reducing the pull force required and the strain on the recoil starter. Once the engine fires, it closes to restore full compression for normal running. Built for tough site and workshop conditions, it suits the TS 400 and TS 700 ranges and keeps starting consistent across daily use. This is a direct screw-in replacement for a worn or leaking decompressor and helps protect the starter rope, pawls and housing by lowering mechanical stress.
Key Features:
- Genuine Stihl part for assured fit and performance (OEM 4223 020 9400)
- Lowers cylinder pressure during starting for an easier pull and quicker fire-up
- Helps protect recoil starter components by reducing load and kickback
- Robust metal construction with a fuel- and heat-resistant O-ring for reliable sealing
- Direct screw-in design for quick replacement using standard hand tools
- Maintains full compression once running for optimal power and cut quality
- Suitable for heavy-duty two-stroke cut-off saw applications on site and in the yard
- Replaces leaking or sticking valves to restore consistent cold and hot starts
Typical Applications:
Used on handheld Stihl cut-off saws in construction, landscaping and hire fleets for easier starts across the day. Ideal when cutting concrete, masonry, asphalt or metal, where frequent stop/starts are common. Recommended after engine work or when the existing valve shows fuel seepage, poor sealing, or the starter becomes hard to pull.
Also known as:
Decompressor, decompressor valve, pressure relief valve, pressure release valve, engine decompression valve, starter aid valve, bleed-off valve, cylinder vent valve.
Fits Models:
TS 400, TS 700, TS 800
Alternate Part Numbers:
4223-020-9400, 42230209400
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