Description
Overview:
This 0.25 oversize piston is a precision-engineered replacement for the Robin/Subaru EH25 petrol engine, commonly found in compact construction and garden equipment. Manufactured from durable aluminium alloy with a machined crown and skirt, it restores correct compression and smooth running when a cylinder has been re-bored to the +0.25 oversize specification. Designed to match the EH25's original geometry, it supports reliable cold starts, stable combustion, and reduced friction when paired with the correct rings and clearances. Ideal for routine rebuilds or resolving wear-related loss of power, it helps extend engine life and maintain fuel efficiency. OEM reference 270-23402-03 aids identification and ensures you are selecting the correct specification for the EH25 platform.
Key Features:
- 0.25 oversize specification for re-bored EH25 cylinders, restoring compression and performance
- Aluminium alloy construction for strength-to-weight balance and dependable heat dissipation
- Precision machining of skirt and ring lands for consistent sealing and reduced blow-by
- Direct-fit geometry for the EH25 to minimise setup time and ensure correct alignment
- Suitable for heavy-duty, high-hour use in site and garden machinery
- Smooth-running characteristics support lower vibration and stable idle when installed to spec
- Corrosion-resistant materials help maintain performance in demanding environments
- Clear OEM reference (270-23402-03) for straightforward parts matching
- Compatible with matching +0.25 piston rings (select to suit EH25) and correct bore clearance
Typical Applications:
Used in Robin/Subaru EH25 engines fitted to generators, water pumps, plate compactors, lawn and garden equipment, small power trowels, and light construction tools. Suitable for engine overhauls where wear, scoring, oil consumption, or reduced compression requires a re-bore to +0.25 and a corresponding oversize piston to bring the engine back to serviceable condition.
Also known as:
EH25 0.25 oversize piston, +0.25 OS piston for EH25, Subaru Robin EH25 oversize piston, 0.25 OS engine piston, EH25 rebore piston, OEM 270-23402-03 piston.
Fits Models:
EH25
Alternate Part Numbers:
270-23402-03, 2702340203
Product Specifications
| L&S Part No. | RB270 23402 03 |
|---|---|
| Manufacturer | Robin/Subaru |
| OEM No. | 270-23402-03 |
| Unit of Sale | 1 |
| Applications | EH25 |
| Machine Type | Engines |
| Fits Brands | Robin |
| Fits Models | EH25 |
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