Description
Overview:
This Pump Piston is a Genuine Stihl spare part designed for the fuel system of Stihl brushcutters and related machines. Manufactured from durable metal, it plays a key role in the carburettor's pumping action, helping deliver fuel correctly for easy starting, steady idling, and smooth running under load. It is engineered for an exact fit in the intended Stihl platforms, including FS87 and FS87R, so it reinstates reliable performance without modification. As part number 4180 121 5803, it is made to the original specification to match the stroke, seal and tolerances required in demanding garden and site work. Suitable for both trade and domestic users, it is a practical replacement when the original pump piston is worn, sticking or damaged.
Key Features:
- Genuine Stihl part (4180 121 5803) for assured compatibility and quality
- Robust metal construction for long service life in tough conditions
- Precision fit restores proper fuel pumping for easier starting and smooth running
- Direct replacement for worn or damaged components to maintain engine efficiency
- Straightforward installation with basic tools; no modifications required
- Suitable for regular maintenance to prevent hard starting and poor throttle response
- Supports reliable operation across a wide range of Stihl brushcutters and attachments
Typical Applications:
Used to replace a failing carburettor pump piston that causes hard starting, uneven idle, or hesitation. Ideal for routine maintenance on machines used for grass trimming, brush clearing, hedge maintenance, edging, and light arb work on domestic gardens, commercial grounds, and construction sites.
Also known as:
Primer piston, carburettor pump plunger, fuel pump piston, priming plunger, carb pump actuator, fuel primer plunger.
Fits Models:
FC 100, FC 90, FC100, FC110, FC90, FC95, FS100, FS100R, FS100RX, FS110, FS110R, FS110RX, FS110X, FS83, FS83T, FS87, FS87R, FS90, FS90R, FT100, HL 95, HL 95 K, HL100, HL100K, HL90, HL90K, HL95, HL95K, HT100, HT101, HT73, KM100, KM100R, KM110R, KM90, KM90R, SP90, SP90T
Alternate Part Numbers:
4180-121-5803, 41801215803
Product Specifications
| L&S Part No. | 4180 121 5803 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 41801215803 |
| Unit of Sale | 1 |
| Machine Type | Brushcutters |
| Fits Brands | Stihl |
| Key Features | - Genuine Stihl part for FS87 and FS87R brushcutters - Durable metal construction for long-lasting use - Precision fit ensures proper fuel delivery - Direct replacement for worn pump pistons - Compatible with multiple Stihl models including FS90, HL100, and KM90 |
| Fits Models | FS83, FS83T | FS90, FS90R | FS100, FS110 | HT73 | HT101 | KM90, KM90R | KM100, KM100R, KM110R | FC 90, 95 | FC 100 | HL90K, HL90, HL95K | HL100, HL100K | HL 95, HL 95 K |
