Description
Overview:
This Genuine Zenith Throttle Spring Nut (OEM 05581) is a small, precision‐machined metal fastener for the Zenith 24T carburettor used on classic JAP and Villiers engines. It secures the throttle return spring to the carburettor linkage, helping to maintain smooth, reliable throttle action and a stable idle. Supplied as unused old stock, it may show light tarnishing or minor storage marks, but remains fully functional and fit for service. Well suited to restoration and routine maintenance, it offers the correct fit and feel expected on vintage engines such as the JAP 4/3 and Villiers MK20. Using the proper nut prevents play in the linkage and ensures the spring is retained safely, supporting dependable running on stationary engines and classic equipment.
Key Features:
- Genuine Zenith part (OEM 05581) for assured compatibility and quality
- Correct fit for Zenith 24T and 24 T-2 carburettors on vintage engines
- Durable metal construction for long service life
- Unused old stock; may display cosmetic age while remaining fully operational
- Helps restore smooth throttle return and consistent idle
- Direct replacement with no modification to original linkage
- Compact, easy-to-handle part; fits with basic hand tools
- Suitable for JAP and Villiers applications common in classic plant and garden machinery
- Supports reliable acceleration and control by securing the throttle spring
Typical Applications:
Used to retain the throttle return spring on Zenith 24T carburettors fitted to JAP and Villiers engines found in vintage plant, stationary engines, compact generators, rotavators, pumps, compressors, and classic garden machinery. Ideal when recommissioning stored engines, replacing missing linkage hardware, or solving erratic throttle behaviour caused by worn or incorrect fasteners.
Also known as:
Throttle nut, carburettor spring nut, throttle return spring nut, carb spring retaining nut, return spring fastener, Zenith 24T spring nut, throttle linkage nut for vintage engines.
Fits Models:
JAP 4, JAP 4/3, JAP 5, JAP 6, MK20, MK25, MK40, Zenith 24 T-2, Zenith 24T
Product Specifications
| L&S Part No. | 05581 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Zenith |
| OEM No. | 05581 |
| Unit of Sale | 1 |
| Applications | JAP 4, JAP 4/3, JAP 5, JAP 6, JAP4, JAP43, JAP5, JAP6, M40, MK20, MK25, MK40, Zenith 24 T-2, Zenith 24T |
| Machine Type | Engines |
| Fits Brands | JAP, Villiers, Zenith |
| Fits Models | MK20 | MK40 | MK25 / C25 | JAP 4, 3 | Zenith 24 T-2 | JAP 5 | JAP 6 |
