Description
Overview:
The Exhaust Valve Guide (Phosphor Bronze) for Villiers MK20 and MK25 is a genuine Villiers component designed to keep the exhaust valve stem running true in the cylinder head. This precision-machined sleeve controls valve stem clearance, aiding heat transfer and maintaining stable engine performance. Made from high-quality phosphor bronze, it offers excellent wear resistance and conforms well under load, making it ideal for the high-temperature exhaust side of small petrol engines. Suited to Villiers MK20 and MK25 engines often found in light plant and garden machinery, it is a direct replacement to restore correct valve guidance during maintenance or rebuilds. Genuine Part, OEM reference EM2525. Unused old stock may show tarnish or storage marks but remains fully functional.
Key Features:
- Genuine Villiers part for assured compatibility and reliability (OEM EM2525)
- Phosphor bronze construction for high wear resistance and thermal stability
- Precision guide bore helps maintain correct valve stem alignment and sealing
- Low-friction material reduces galling and scuffing for longer valve life
- Supports consistent compression and smoother running when clearances are in spec
- Durable replacement suited to servicing, decoke, overhaul, and full rebuild work
- Unused vintage stock: cosmetic ageing does not affect performance
- Direct replacement for MK20/MK25 cylinder heads-no adaptation required
- Clean cylindrical form with lead-in features to aid accurate installation
Typical Applications:
Used when refurbishing the cylinder head, correcting excessive valve stem play, or restoring performance after wear or overheating. Common in maintenance of Villiers-powered machinery such as mowers, rotavators, small generators, pumps, and light construction equipment. Appropriate for preventative servicing to maintain exhaust valve stability, heat transfer, and emissions control.
Also known as:
Exhaust valve guide bush, bronze valve bush, valve stem guide, exhaust guide sleeve, valve sleeve, guide bush, valve stem bearing. These terms may be used interchangeably in engine rebuild and parts catalogues.
Fits Models:
C25, MK20, MK25
Product Specifications
| L&S Part No. | EM2525 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Villiers |
| OEM No. | EM2525 |
| Unit of Sale | 1 |
| Machine Type | Engines |
| Fits Brands | Villiers |
| Key Features | - Genuine Villiers part, OEM reference EM2525 - Phosphor bronze for wear resistance and thermal stability - Direct replacement for Villiers MK20/MK25 engines - Precision guide bore ensures correct valve alignment - Suitable for cylinder head refurbishments and rebuilds |
| Fits Models | MK20 | MK25 / C25 |
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