Description
Overview:
This throttle stop screw spring is a genuine Zenith component for the 13TC carburettor used on JAP engines. Made from durable steel with a bright, silver-toned finish, it provides the correct preload on the throttle stop (idle) screw, so your idle setting stays steady during operation. The compact helical design delivers consistent tension for precise throttle regulation and reliable engine performance. It is well suited to vintage JAP applications, including the JAP 2A and JAP 2S, and other equipment built around the Zenith 13TC. Supplied as unused old stock, it may show minor tarnishing from long-term storage but remains fully functional. A practical, authentic replacement for restoration or routine maintenance of classic plant, stationary engines, and garden machinery using the 13TC carburettor.
Key Features:
- Genuine Zenith part for correct fit and function on 13TC carburettors
- Robust steel coil for long service life and consistent spring rate
- Maintains idle screw tension to prevent settings drifting from vibration
- Direct replacement; quick to install with basic hand tools
- Compact helical form seats correctly against the carburettor body and screw
- Suitable for JAP 2A and JAP 2S engines and other 13TC-equipped machines
- Unused old stock (vintage OEM), with possible light storage tarnish only
- Helps stabilise idle speed and improves throttle response on classic engines
Typical Applications:
Used on vintage machinery fitted with the Zenith 13TC carburettor, including JAP-powered stationary engines, small plant, compressors, and certain garden machines. Ideal for restorations, scheduled servicing, and returning worn or missing carburettor hardware to original specification for stable idle and consistent running.
Also known as:
Throttle stop spring, idle speed screw spring, idle adjuster spring, carburettor stop screw spring, carb idle screw spring, carb spring for throttle stop.
Fits Models:
13TC, JAP 2, JAP 2A, JAP 2S, JAP2, JAP2A, JAP2S, Suffolk
Product Specifications
| L&S Part No. | 08539 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Zenith |
| OEM No. | 08539 |
| Unit of Sale | 1 |
| Applications | 13TC, JAP 2, JAP 2A, JAP 2S, JAP2, JAP2A, JAP2S, Suffolk |
| Machine Type | Engines |
| Fits Brands | Zenith |
| Fits Models | JAP 2 |
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