Description
Overview:
This Throttle Adjusting Screw is a genuine OEM component for vintage Amal 519 type carburettors, supplied under part number 23/139. Made from durable metal, it provides precise control over the throttle stop/idle setting so your engine runs smoothly at low speed. It is suited to classic installations using the Amal Type 519 and Villiers F15, often found on older motorcycles and small industrial or garden engines. As unused old stock, each screw is original and service-ready, though minor tarnishing or storage marks may be present. Its straightforward slotted head design allows easy adjustment with a standard screwdriver, making it a practical replacement for worn or missing screws while keeping your machine faithful to period specification.
Key Features:
- Genuine part (OEM 23/139) for correct fit and function
- Suits Amal 519 type carburettors and Villiers F15 applications
- Robust metal construction for long service life
- Fine, repeatable idle/throttle stop adjustment for smooth running
- Slotted head for easy turning with common hand tools
- Helps restore stable tickover and prevent stalling at low RPM
- Suitable for restorations where originality matters
- Supplied as unused vintage stock; may show light tarnish from storage
- Simple to install during routine carburettor maintenance
Typical Applications:
Used to set the throttle stop/idle speed on vintage carburettors in classic motorcycles, light industrial engines, and older garden machinery. Ideal when rebuilding an Amal 519 unit, renewing worn hardware, or fine-tuning tickover on engines such as Villiers F15. Supports routine servicing and sympathetic restorations.
Also known as:
Idle stop screw, slide stop screw, throttle stop screw, idle speed adjuster, tickover screw, carb idle screw, carburettor idle adjuster.
Fits Models:
Amal Type 519, Villiers F15, BSA
Product Specifications
| L&S Part No. | 23/139 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Amal |
| OEM No. | 23/139 |
| Unit of Sale | 1 |
| Fits Brands | Amal, Villiers |
| Key Features | - Genuine OEM part for Amal 519 carburettors - Compatible with Villiers F15 engines - Durable metal construction ensures longevity - Slotted head for easy screwdriver adjustment - Ideal for vintage motorcycle restorations |
| Fits Models | F15 |
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