Description
Overview:
The Carburettor C1Q-S121B is a genuine Stihl replacement part designed for the MS 181 and MS 181 C chainsaws. Built with a robust metal alloy body and precision internal components, it accurately meters the fuel-air mixture to keep your engine starting easily, idling smoothly and pulling cleanly under load. It helps resolve symptoms such as hard starting, poor throttle response, stalling and high fuel consumption caused by a worn or contaminated carburettor. Suitable for regular maintenance or a like-for-like replacement, it fits directly in place of the original unit without modification. This OEM part supports reliable performance for domestic and professional users alike. Manufacturer Part Number (MPN): 11391200605. Genuine Stihl part for assured fit and compatibility.
Key Features:
- Genuine Stihl OEM carburettor for MS 181 / MS 181 C
- Accurately regulates fuel and air for consistent power and smooth running
- Durable metal alloy construction for long service life
- Direct-fit replacement with existing mounting points and connections
- Factory-spec calibration; only minor tuning may be required after fitting
- Helps restore easy starting, steady idle and clean acceleration
- Supports correct fuel economy and reduces bogging under load
- Suited to routine servicing or complete carburettor replacement
- Compatible with standard Stihl fuel lines, gaskets and linkages
Typical Applications:
Restoring performance on Stihl MS 181 series saws used for firewood cutting, pruning, storm clearance, fencing work and general grounds maintenance. Ideal when diagnosing rough running, flooding, erratic idle or flat spots on acceleration, or when rebuilding a saw after storage.
Also known as:
Chainsaw carburettor, carb, carburetor, fuel-air mixer, carb assembly, mixer unit, C1Q-S121B carb, saw carburettor replacement, OEM carb for MS 181 series.
Fits Models:
MS 181
MS 181 C
MS181
MS181C
Alternate Part Numbers:
1139-120-0605, 11391200605
Product Specifications
| L&S Part No. | 1139 120 0605 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 11391200605 |
| Unit of Sale | 1 |
| Machine Type | Chainsaws |
| Fits Brands | Stihl |
| Key Features | - Genuine Stihl OEM carburettor for MS 181 / MS 181 C - Durable metal alloy construction for long service life - Direct-fit replacement with existing mounting points - Accurately regulates fuel and air for smooth running - Compatible with standard Stihl fuel lines and gaskets |
| Fits Models | MS181, MS181C |
