Description
Overview:
The Cylinder Head for Jap Models 80 & JS8 Engines is a robust, precision-cast metal head that restores correct combustion sealing and heat management on classic JAP power units. As a Genuine JAP part, OEM No. 20459, it is made to the original specification for reliable fit and performance on JAP Model 80 and JS8 engines. The head forms the upper boundary of the combustion chamber, helping to maintain compression, efficiency, and stable running. Supplied as unused old stock, it is ideal for keeping period machinery authentic while addressing cracked, warped, or heavily corroded originals. Being vintage stock, minor tarnishing or storage marks may be present, but this does not affect serviceability when installed with the correct gasket and torque procedure.
Key Features:
- Genuine JAP part for assured compatibility and reliability (OEM No. 20459)
- Correct stud pattern and gasket profile for JAP Model 80 and JS8
- Durable cast construction designed to withstand thermal cycling and vibration
- Accurately machined sealing faces to help retain compression and minimise blow-by
- Spark plug boss and features positioned as per original specification
- Unused old stock: may show age-related tarnish/storage marks only
- Supports efficient heat transfer on air-cooled engines for consistent performance
- Straightforward to fit using standard workshop tools and proper torque sequence
- Suitable for period-correct restoration and long-term maintenance of vintage machinery
Typical Applications:
Used on JAP Model 80 and JS8 engines found in classic light plant and stationary equipment, including site mixers, water pumps, small generators, rotavators, and similar garden and construction machinery. Suitable for restoring non-running engines, resolving poor compression, or replacing damaged heads while keeping original specification and appearance.
Also known as:
J.A.P. cylinder head, JAP 80 head, JS8 head, engine head casting, cylinder cover/head for JAP stationary engines, OEM 20459 head, vintage JAP top-end head component.
Fits Models:
JAP Model 80
JAP JS8
Product Specifications
| L&S Part No. | 20459 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | JAP |
| OEM No. | 20459 |
| Unit of Sale | 1 |
| Machine Type | Engines |
| Fits Brands | JAP |
| Key Features | - Genuine JAP part, OEM No. 20459, for assured compatibility - Fits JAP Model 80 and JS8 engines - Durable cast construction withstands thermal cycling - Accurately machined sealing faces retain compression - Supports efficient heat transfer on air-cooled engines |
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