Description
Overview:
The Valve Spring is a genuine Villiers spare designed for 125cc and 150cc engines. Made from durable spring steel, it returns the valve to its seat and maintains the correct valve timing, helping the engine idle smoothly and perform reliably across the rev range. This OEM component (part no. 250D5) is built to original specification for a proper fit and consistent spring force. It is suitable for classic Villiers engine rebuilds and routine top-end services on small motorcycles, stationary plant, and horticultural machinery that use these engines. This vintage item is unused old stock and may show light tarnishing from age, which does not affect performance. A correct valve spring is essential to prevent valve float, maintain compression, and protect the cam and valve train from premature wear.
Key Features:
- Genuine Part: Villiers OEM, part no. 250D5, for assured compatibility with 125cc and 150cc engines
- Durable construction: heat-treated spring steel for strength and long service life under cyclic loads
- Built to original spec: consistent seating pressure for stable idle, clean acceleration, and reliable high‐rpm control
- Helps prevent valve float and misfire by keeping valves seated at the right time
- Direct replacement for worn or weakened springs; typically no modification required
- Suitable for vintage restorations: unused old stock may have cosmetic tarnish only
- Reliable performance at normal operating temperatures and oil conditions
- Supports proper valve train geometry, reducing wear on tappets, guides, and seats
- Straightforward to fit during a cylinder head or top-end service using standard workshop tools
Typical Applications:
Used when rebuilding or servicing Villiers 125cc and 150cc engines to restore correct valve operation. Ideal for fixing symptoms such as loss of compression, rough running, backfiring, or reduced top-end power. Common in classic motorcycles, small industrial and stationary engines, and horticultural machinery powered by Villiers units.
Also known as:
Valve return spring, valve coil spring, cylinder head valve spring, cam valve spring, engine valve spring, valve train spring.
Fits Models:
125cc, 150cc
Product Specifications
| L&S Part No. | 25005 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Villiers |
| OEM No. | 250D5 |
| Unit of Sale | 1 |
| Machine Type | Engines |
| Fits Brands | Villiers |
| Key Features | - Genuine Villiers OEM part no. 250D5 for 125cc/150cc engines - Made from heat-treated spring steel for durability - Consistent seating pressure for stable idle and reliable high-rpm control - Prevents valve float, maintaining compression and reducing wear - Suitable for vintage restorations; unused old stock with possible tarnish |
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