Description
Overview:
The metering diaphragm is a small, fuel‐resistant component that controls fuel delivery inside the carburettor, helping your machine start cleanly, idle steadily and respond well to throttle. This genuine Stihl part suits hedgecutters and brushcutters and is a direct replacement for OEM No. 4149 121 4701 (MPN 41491214701). Built for reliable operation with petrol, it restores correct metering when the original diaphragm has hardened, stretched or torn through age and ethanol exposure. Designed for Stihl machines including HL 91 KC and HL 92 KC, it integrates neatly into the carburettor during routine servicing. Using the correct genuine diaphragm helps maintain performance, reduce flat spots and prevent lean or rich running that can lead to poor cutting performance or premature engine wear.
Key Features:
- Genuine Stihl part for assured fit and performance
- Direct replacement for OEM No. 4149 121 4701
- Fuel‐resistant diaphragm material for long service life
- Restores correct fuel metering, starting and idle quality
- Helps prevent lean/rich running and associated engine wear
- Precision‐made to match the original carburettor specification
- Easy to fit during a standard carburettor clean or rebuild
- Suitable for regular petrol including E10 within manufacturer guidance
- Supports efficient cutting under load by ensuring steady fuel flow
Typical Applications:
Routine maintenance and repair of Stihl hedgecutters and brushcutters where hard starting, erratic idle, hunting, hesitation or loss of power suggests a worn carburettor diaphragm. Ideal when refreshing fuel system components after winter storage, ethanol‐related degradation, or contamination. Commonly fitted during a carburettor service alongside gaskets, screens and needle checks to restore consistent performance in professional and domestic use.
Also known as:
Carburettor metering diaphragm, metering membrane, carb diaphragm, fuel metering diaphragm, carburettor membrane, diaphragm for carburettor, fuel control diaphragm.
Fits Models:
FS 94, FS 94 C, FS 94 R, FS 94 RC, HL 91 K, HL 91 KC, HL 92 C, HL 92 KC, HL 94, HL 94 C, HL 94 K, HL 94 KC, KM 94 R, KM 94 RC
Alternate Part Numbers:
4149-121-4701, 4149 121 4700, 41491214701, 41491214700
Product Specifications
| L&S Part No. | 4149 121 4701 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 41491214701 |
| Unit of Sale | 1 |
| Applications | FS 94, FS 94 C, FS 94 R, FS 94 RC, FS94, FS94 C, FS94C, FS94R, FS94RC, HL 91 K, HL 91 KC, HL 92 C, HL 92 KC, HL 94, HL 94 C, HL 94 K, HL 94 KC, HL91K, HL91KC, HL92C, HL92KC, HL94, HL94C, HL94K, HL94KC, KM 94 R, KM 94 RC, KM94R, KM94RC |
| Machine Type | Hedgetrimmers |
| Fits Brands | Stihl |
| Fits Models | FS94, FS94 C, FS94R, FS94RC | KM94R, KM94RC | HL91K, HL91KC | HL92C, HL92KC | HL94, HL94C, HL94K, HL94KC |
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