Description
Overview:
The Filter Base for Stihl MS181, MS181C (MPN: 1139 120 3401) is the moulded support that the air filter sits on inside the chainsaw's airbox. As a genuine Stihl part, it is built from durable, fuel- and oil-resistant plastic to maintain a reliable seal between the intake and filter, helping to keep dust and debris away from the engine. This ensures clean airflow, stable performance, and easier maintenance. Designed for Stihl homeowner and light professional chainsaws, it is a direct-fit replacement for models such as the MS181 and MS181 C. Replacing a worn or cracked base restores correct filter seating and airflow, supporting efficient running, starting, and long-term engine protection without modification.
Key Features:
- Genuine Stihl OEM part for assured compatibility and fit
- Robust moulded plastic construction resists vibration, heat, fuel, and oil
- Maintains proper air filter seating and airbox sealing for effective filtration
- Helps protect the engine from dust ingress and premature wear
- Direct replacement for the original base; no modifications required
- Stable fit reduces the risk of air leaks that can affect performance
- Supports consistent starting, idling, and throttle response
- Suitable for routine servicing or repair after damage to the original base
Typical Applications:
Used during routine servicing or repairs on Stihl chainsaws to restore the air filtration mounting point. Ideal when the existing base is cracked, warped, or no longer sealing well, which can lead to poor running, hard starting, or increased engine wear. Common in workshop maintenance schedules and DIY replacements.
Also known as:
Air filter base, filter holder, filter mount, airbox base, air filter support, air filter seat for Stihl 1139-series compact chainsaws.
Fits Models:
MS 171, MS 171 C, MS 181, MS 181 C, MS171, MS171C, MS181, MS181C
Alternate Part Numbers:
1139-120-3401, 11391203401
Product Specifications
| L&S Part No. | 1139 120 3401 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 11391203401 |
| Unit of Sale | 1 |
| Applications | MS 171, MS 171 C, MS 181, MS 181 C, MS171, MS171C, MS181, MS181C |
| Machine Type | Chainsaws |
| Fits Brands | Stihl |
| Fits Models | MS171, MS171C | MS181, MS181C |
