Description
Overview:
The Piston 0.25 for Robin/Subaru engines is a precision-made replacement component used to restore cylinder sealing and compression in small petrol engines commonly found in compactors, generators, water pumps, and garden machinery. Manufactured from lightweight cast aluminium alloy for good heat transfer and strength-to-weight balance, it is designed to match the original crown profile and skirt geometry so the engine runs smoothly and efficiently. The 0.25 oversize specification (0.25 mm OS, first oversize) suits correctly re-bored cylinders where wear or scoring is present. Identified by OEM No. 106-23422-H1, it provides a reliable reference for parts lookup and installation during routine maintenance or full rebuilds, helping extend engine life and performance in demanding site and outdoor use.
Key Features:
- 0.25 oversize piston (0.25 mm OS, first oversize) for reconditioned cylinders to recover compression and power.
- OEM-matched profile and dimensions to maintain correct deck height and combustion characteristics (OEM No. 106-23422-H1).
- Cast aluminium alloy construction for durability, low reciprocating mass, and efficient heat dissipation.
- Tight machining tolerances support smooth operation, reduced blow-by, and lower oil consumption when replacing worn parts.
- Suitable for a wide range of Robin/Subaru small engines used in construction and garden equipment; verify by OEM number.
- Clean, accurate pin-bore and skirt geometry to minimise piston slap and wear when installed to specification.
- Straightforward fit with standard workshop tools; ideal for planned maintenance and quick turnaround repairs.
- Built to handle regular, heavy-duty service typical of hire fleets, contractors, and demanding DIY tasks.
Typical Applications:
Used during engine overhauls where the cylinder has been honed or re-bored to first oversize, including plate compactors, generators, pressure washers, water pumps, turf equipment, and other machinery powered by Robin/Subaru petrol engines. Helps restore starting, performance, and efficiency after wear, scoring, or loss of compression. Always confirm bore size and clearances to the engine service manual.
Also known as:
0.25 OS piston, first oversize piston, oversize engine piston 0.25, Robin Subaru replacement piston, small engine piston for re-bore, aluminium engine piston for Robin/Subaru, cylinder rebuild piston, piston for compactors/generators, service piston for Subaru Robin engines.
Alternate Part Numbers:
106-23422-H1, 10623422H1
Product Specifications
| L&S Part No. | RB106 23422 H1 |
|---|---|
| Manufacturer | Robin/Subaru |
| OEM No. | 106-23422-H1 |
| Unit of Sale | 1 |
| Machine Type | Engines |
| Fits Brands | Robin |
| Key Features | - 0.25 mm oversize for reconditioned cylinders - OEM No. 106-23422-H1 for accurate parts lookup - Cast aluminium alloy for efficient heat dissipation - Tight tolerances reduce blow-by and oil consumption - Fits Robin/Subaru engines in construction and garden equipment |
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