Description
Overview:
The Valve Spring (Inlet) for the BSA 90 Series industrial engine, Manufacturer Part Number (MPN) 86 6527, is a Genuine BSA OEM component engineered to control the inlet valve through the full operating range of the engine. Made from heat-treated, high‑carbon spring steel for strength and fatigue resistance, this spring ensures positive valve closure, stable idle, and reliable timing, helping to prevent valve float at higher engine speeds. It is intended for the inlet side only and is not interchangeable with the exhaust spring unless specified by the service manual. Suitable for BSA 90cc industrial engines often used in compact plant and garden machinery, this part keeps engines starting well and running smoothly in everyday use. Compatible with the BSA 90CC model.
Key Features:
- Genuine BSA OEM inlet valve spring for 90 Series engines
- OEM reference: 86 6527 for accurate fit and performance
- High‑carbon, heat‑treated spring steel for durability and long service life
- Correct spring rate for the inlet position to maintain valve control
- Helps prevent valve float and misfire under load
- Consistent valve seating improves compression, idle quality, and starting
- Direct replacement—fits standard retainers and collets with no modification
- Corrosion‑resistant finish to withstand damp and oily environments
- Manufactured to OEM tolerances for reliable repeatability
- Suitable for routine overhauls and preventative maintenance
Typical Applications:
Used in BSA 90cc industrial engines fitted to light construction and garden machinery such as small cement mixers, water pumps, generators, compressors, and cultivators. Ideal when restoring engines to factory specification or replacing weakened springs that cause poor starting, rough running, or loss of power.
Also known as:
Inlet valve return spring, inlet valve spring, engine valve spring (inlet), BSA 90 valve spring, valve return spring for BSA industrial engine.
Fits Models:
BSA 90CC
Alternate Part Numbers:
86 6527, 86-6527, 866527
Product Specifications
| L&S Part No. | 86 6527 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Villiers |
| OEM No. | 86 6527 |
| Unit of Sale | 1 |
| Machine Type | Engines |
| Fits Brands | Villiers |
Reviews
Ask a Question
Compatibility
Customers also bought
-
![]()
Key Steel (Imperial) Length: 12" Assorted Pack of 20£78.14 £65.12 -
![]()
Flat Bar, Sizes: 20 x 3-6mm - Assorted Pack of 10£79.52 £66.27
Related Products
-
![]()
Key Steel (Imperial) Length: 12" Assorted Pack of 20£78.14 £65.12 -
![]()
Flat Bar, Sizes: 20 x 3-6mm - Assorted Pack of 10£79.52 £66.27
