Description
Overview:
The Pump Diaphragm for Stihl HT73 and FS83 is a Genuine Stihl part designed to restore reliable fuel delivery in two‐stroke tools that use a pulse‐operated carburettor. Made from a flexible, fuel‐resistant elastomer, this thin membrane responds to engine pressure pulses to draw fuel through the carburettor, supporting easy starting, clean acceleration and stable running. It replaces a worn or hardened diaphragm that can cause poor priming, lean running or stalling. This OEM diaphragm fits a wide range of Stihl machines, including pole pruners, brushcutters, combi engines, blowers and more, and is supplied to the original specification for correct fit and function. Part number 4180 121 4800 helps keep your equipment performing as intended with minimal downtime.
Key Features:
- Genuine Stihl OEM part for accurate fit and dependable performance
- Fuel‐resistant elastomer construction for durability in typical two‐stroke fuels
- Restores correct carburettor pumping action for easier starts and smoother running
- Helps resolve hard starting, hesitation and poor priming caused by a tired diaphragm
- Direct replacement: no modifications required; fits the original carburettor housing
- Suitable for frequent professional use and routine DIY maintenance
- Compact, lightweight component that supports consistent engine tuning and output
- Designed for long service life when installed with clean gaskets and filters
Typical Applications:
Used during carburettor servicing or overhaul on Stihl pole pruners, brushcutters, kombi engines, hedge trimmers, blowers, earth augers and edgers. Ideal when equipment is difficult to prime, starts then dies, or surges under load. Commonly replaced as part of seasonal maintenance to maintain reliable fuel delivery and reduce unplanned downtime on site or in the garden.
Also known as:
Fuel pump diaphragm, carburettor pump membrane, priming pump diaphragm, purge‐circuit diaphragm, carb pump film, diaphragm membrane, carburettor fuel membrane.
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, FT100, 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:
4180-121-4800, 41801214800
Product Specifications
| L&S Part No. | 4180 121 4800 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 41801214800 |
| 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, FT100, 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, Pole Pruners |
| 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 |
