Description
Overview:
This genuine Stihl insulator is a precision thermal and vibration isolator used in petrol chainsaws to protect adjacent components from engine heat and mechanical shock. Made from a high‐temperature resistant polymer, it sits between key assemblies to reduce heat transfer and help keep the intake and carburettor area stable during operation. Designed specifically for Stihl MS 171 and MS 181 models, it matches the original dimensions for a clean, accurate fit. By limiting heat soak and unwanted movement, the insulator supports smooth running, consistent tuning, and longer service life of connected parts such as gaskets, seals, and the carburettor body. Supplied as a Genuine Part, it offers dependable compatibility and performance for routine maintenance or as a like‐for‐like replacement.
Key Features:
- Genuine Stihl OEM part for assured fit and compatibility
- High‐temperature polymer construction to reduce heat transfer from the engine
- Helps damp vibration to protect the intake and carburettor assembly
- Direct replacement for OEM 1139 405 8000 for straightforward fitting
- Accurate moulding and mounting points for reliable sealing and alignment
- Supports stable idling and tuning by limiting heat soak and movement
- Durable design for regular use in both professional and domestic settings
- Suitable for preventive maintenance or when the original insulator is worn, cracked, or warped
Typical Applications:
Used when servicing the intake or carburettor, troubleshooting hot‐running issues, replacing a heat‐damaged or distorted spacer, or resolving air‐leak symptoms and erratic idle. Ideal during rebuilds, after impact damage, or as preventative maintenance to maintain reliability in everyday cutting, pruning, and firewood tasks.
Also known as:
Carb insulator, insulating flange, carburettor spacer, manifold insulator, intake isolator block, thermal isolator, heat shield, spacer block.
Fits Models:
MS 171, MS 171 C, MS 181, MS 181 C, MS 211, MS 211 C
Alternate Part Numbers:
1139-405-8000, 11394058000
Product Specifications
| L&S Part No. | 1139 405 8000 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 11394058000 |
| Unit of Sale | 1 |
| Applications | MS 171, MS 171 C, MS 181, MS 181 C, MS 211, MS 211 C, MS171, MS171C, MS181, MS181C, MS211, MS211C |
| Machine Type | Chainsaws |
| Fits Brands | Stihl |
| Fits Models | MS171, MS171C | MS181, MS181C | MS211, MS211C |
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