Description
Overview:
This 0.25 oversize piston is a precision-engineered replacement part for Robin/Subaru small engines, supporting reliable operation in construction and garden machinery. Made from high-grade aluminium alloy for strength and efficient heat dissipation, the piston helps restore correct compression and smooth running after cylinder wear or a rebore. The 0.25 mm oversize (approx. 0.010 in) dimension is intended for cylinders machined to the first oversize, providing a snug, service-ready fit. Suitable for equipment such as lawn mowers, generators, water pumps, tillers, and compactors, it is designed to match OEM geometry for consistent sealing and performance. Identified as RB254 23402 03, it is commonly used on selected Robin/Subaru RB-series applications (including RB254 where specified), supporting dependable starting, power delivery, and fuel efficiency.
Key Features:
- 0.25 mm oversize piston (approx. 0.010 in) for rebored cylinders at first oversize
- Aluminium alloy construction for light weight and rapid heat transfer
- OEM‐equivalent dimensions and tolerances for a precise fit and correct ring seating
- Precision-machined crown and skirt to support stable combustion and reduced friction
- Helps restore compression, power, and throttle response in tired engines
- Compatible with OEM-spec rings and gudgeon pin when matched to the same oversize
- Durable build for long service life in demanding site and garden use
- Straightforward installation to minimise downtime during scheduled maintenance
Typical Applications:
Used during engine overhauls or repairs on small petrol engines found in lawn mowers, generators, water pumps, plate compactors, rotavators, and other plant and garden machinery. Ideal where the cylinder has been bored to 0.25 mm oversize (approx. 0.010 in), bringing worn engines back within specification and improving reliability for daily or seasonal use.
Also known as:
Engine piston, 0.25 mm OS piston (approx. 0.010 in), first oversize piston, Robin/Subaru replacement piston, RB-series piston, oversize cylinder piston, small engine piston for service rebuilds.
Product Specifications
| L&S Part No. | RB254 23402 03 |
|---|---|
| Unit of Sale | 1 |
| Fits Brands | Robin |
| Key Features | - 0.25 mm oversize for rebored cylinders - Aluminium alloy for efficient heat dissipation - OEM-equivalent dimensions for precise fit - Compatible with OEM-spec rings and gudgeon pin - Suitable for lawn mowers, generators, and compactors |
Reviews
Ask a Question
Compatibility
Customers also bought
-
![]()
Key Steel (Imperial) Length: 12" Assorted Pack of 20£83.17 £69.31 -
![]()
Flat Bar, Sizes: 20 x 3-6mm - Assorted Pack of 10£83.68 £69.73
Related Products
-
![]()
Key Steel (Imperial) Length: 12" Assorted Pack of 20£83.17 £69.31 -
![]()
Flat Bar, Sizes: 20 x 3-6mm - Assorted Pack of 10£83.68 £69.73
