Description
Overview:
The Piston Ring Set +040 is a genuine JAP component for restoring and maintaining Villiers JAP 4/3 vintage petrol engines, including JAP 3 and JAP 4. It replaces worn rings to restore compression and oil control, helping the engine start reliably and produce stable power. The +0.040 in oversize (1.016 mm) suits cylinders that have been re-bored to this specification. Manufactured to original tolerances from durable ring materials with a precision-ground finish, it is suitable for professional rebuilds and careful DIY restorations alike. As unused old stock (NOS), it offers authentic fit and function consistent with period specifications, making it a practical choice for historically correct repairs on classic plant and machinery using JAP single-cylinder engines.
Key Features:
- Genuine JAP part for correct fit, function, and authenticity
- Oversize: +0.040 in (1.016 mm) for re-bored cylinders
- Unused old stock for original-quality performance (may show light storage age)
- Restores compression sealing and oil control to reduce blow-by and oil consumption
- Precision-manufactured ring profiles for reliable seating and longevity
- Suitable for professional workshops and careful home rebuilds
- Designed for Villiers JAP 4/3 vintage engines
- Helps improve starting, idle stability, and overall engine efficiency
- Supplied as a matched ring set for consistent fit on the piston and in the bore
- Manufacturer part number: JAP43RS40
Typical Applications:
Used during engine overhauls and maintenance on classic machinery powered by JAP 3 or JAP 4 engines, including stationary equipment and light plant. Typical use cases include restorations of vintage pumps, generators, mowers, small agricultural equipment, compact site tools, and general purpose engines where a +0.040 in (1.016 mm) rebore has been carried out.
Also known as:
Engine piston rings, compression rings, oil control rings, ring set +40, 0.040 in oversize rings (1.016 mm), oversize piston ring set, JAP 4/3 ring set, vintage engine rings, motor rings, classic engine rings.
Fits Models:
JAP 3, JAP 4, JAP3, JAP4
Product Specifications
| L&S Part No. | JAP43RS40 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | JAP |
| OEM No. | JAP43RS40 |
| Unit of Sale | 1 |
| Applications | JAP 3, JAP 4, JAP3, JAP4 |
| Machine Type | Engines |
| Fits Brands | Villiers |
| Fits Models | JAP 4, 3 |
