Description
Overview:
The decompression valve is a small, screw-in engine component for Stihl cut-off saws that momentarily releases cylinder pressure to make pull-starting easier. This non-genuine part is a direct replacement for OEM 4223 020 9400 and is suitable for popular models such as the Stihl TS400 and TS410. It features a robust metal body with a heat- and fuel-resistant sealing ring to cope with high temperatures and vibration near the cylinder head. By reducing peak compression during starting, it helps protect the starter rope and recoil mechanism while promoting a smoother first fire. A practical, cost-effective spare for routine servicing or after engine work, it restores dependable starting performance on busy job sites.
Key Features:
- Non-genuine replacement engineered to replace OEM 4223 020 9400
- Durable metal construction with fuel- and heat-resistant sealing components
- Reduces starting effort by venting cylinder pressure during cranking
- Direct screw-in fit to the cylinder head port on compatible Stihl saws
- Helps protect recoil starter components and starter rope from strain
- Designed for harsh environments with vibration and thermal cycling
- Precision-made for consistent sealing and reliable operation
- Cost-effective way to restore easy, predictable starts
Typical Applications:
Used on Stihl petrol cut-off saws in construction, utilities, landscaping, and hire fleets where frequent starts are required. Ideal after cylinder or piston replacement, during routine maintenance, or when hard starting suggests the original valve is leaking or stuck. Supports reliable starting performance in cold weather or on high-compression two‐stroke engines.
Also known as:
Decomp valve, pressure relief valve, pressure bleed valve, starter assist valve, manual compression release, cylinder head release valve.
Fits Models:
TS 400, TS 410, TS 700, TS 800
Alternate Part Numbers:
4223 020 9400, 42230209400, E6003
Product Specifications
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