Description
Overview:
The Pump Diaphragm for Stihl small engines is a Genuine Stihl part that restores correct fuel transfer inside the carburettor for reliable starting, steady idling, and clean acceleration. Manufactured from a fuel‐resistant elastomer to withstand modern pump fuels, it is designed to work precisely with Stihl 2‐stroke machines across the range, including hedge trimmers, brushcutters, kombi engines, blowers and augers. It is an exact match for Stihl HT100 and HT101 among many others. Using OEM Part No. 4180 121 4801, this diaphragm replaces aged, hardened or torn membranes that can cause poor running, surging or stalling. A direct-fit component, it is suitable for routine maintenance or repairs where consistent fuel delivery and dependable performance are required.
Key Features:
- Genuine Stihl part for assured compatibility and fit with specified models
- Fuel‐resistant elastomer construction for durability and long service life
- Restores stable fuel metering for easier starting and smooth running
- Helps resolve hesitation, lean running and inconsistent idle caused by worn diaphragms
- Precision profile maintains correct pump action within the carburettor
- Direct replacement using basic hand tools; no modifications required
- Supports engine efficiency and reduces unnecessary fuel consumption
- Suited to professional daily use and domestic maintenance schedules
- OEM reference 4180 121 4801 for correct identification
- Cost‐effective fix before considering full carburettor replacement
Typical Applications:
Used during servicing or repair of Stihl handheld 2‐stroke machinery to correct fuel delivery issues. Typical signs include hard starting, poor throttle response, uneven idle, or cutting out under load. Ideal for workshop overhauls, seasonal recommissioning, fleet maintenance, and DIY repairs where reliability and consistent performance are required.
Also known as:
Carburettor pump diaphragm, fuel pump membrane, carb diaphragm, fuel delivery diaphragm, carburettor membrane, diaphragm insert for carb, pump membrane for trimmer/brushcutter engines.
Fits Models:
BR500, BR550, BR600, BR700, BT 130, BT 130 Z, BT130, BT130Z, FC 100, FC 90, FC100, FC110, FC90, FC95, FR130T, FS100, FS100R, FS100RX, FS110, FS110R, FS110RX, FS110X, FS120, FS130, FS130R, FS200, FS250, FS310, FS83, FS83T, FS87, FS87R, FS90, FS90R, HL 95, HL 95 K, HL100, HL100K, HL90, HL90K, HL95, HL95K, HT100, HT101, HT130, HT131, HT73, KM100, KM100R, KM110R, KM130, KM130R, KM90, KM90R, SP90, SP90T
Alternate Part Numbers:
4180-121-4801, 41801214801
Product Specifications
| L&S Part No. | 4180 121 4801 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 41801214801 |
| Unit of Sale | 1 |
| Applications | BR500, BR550, BR600, BR700, BT 130, BT 130 Z, BT130, BT130Z, FC 100, FC 90, FC100, FC110, FC90, FC95, FR130T, FS100, FS100R, FS100RX, FS110, FS110R, FS110RX, FS110X, FS120, FS130, FS130R, FS200, FS250, FS310, FS83, FS83T, FS87, FS87R, FS90, FS90R, HL 95, HL 95 K, HL100, HL100K, HL90, HL90K, HL95, HL95K, HT100, HT101, HT130, HT131, HT73, KM100, KM100R, KM110R, KM130, KM130R, KM90, KM90R, SP90, SP90T |
| Machine Type | Brushcutters, Hedgetrimmers, Pole Pruners, Backpack Blowers, Mist Blowers |
| Fits Brands | Stihl |
| Fits Models | FS83, FS83T | FS90, FS90R | FS100, FS110 | FS120, FS200, FS250 | FS130, FS130R | FS310 | BR500 | FR130T | HT73 | HT101 | HT130 | HT131 | KM90, KM90R | KM100, KM100R, KM110R | KM130, KM130R | FC 90, 95 | FC 100 | BT 130 | BT 130 Z | HL90K, HL90, HL95K | HL100, HL100K | BR550 | BR600 | BR700 | HL 95, HL 95 K |
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