Description
Overview:
This oversize piston is designed for the Robin/Subaru EH12 single‐cylinder petrol engine. Made from durable cast aluminium alloy with a machined crown and ring grooves, it restores correct clearances and compression in worn cylinders. The 0.50 mm oversize (approx. 0.020 in) suits engines that have been rebored to the matching specification. Built for dependable running and clean combustion, it is suitable for construction and garden machinery powered by the EH12, such as compactors, generators and pumps. Precision manufacture helps maintain smooth operation under load and good cold starting. Supplied to match the OEM reference 268-23403-03 for straightforward identification and replacement, it supports long service life when installed with the correct rings and clearances as specified in the engine manual.
Key Features:
- 0.50 mm oversize piston (≈ 0.020 in) for rebored EH12 cylinders
- Cast aluminium alloy body for strength, heat dissipation and reduced reciprocating mass
- Accurate machining of skirt, crown and grooves to support stable compression and oil control
- Compatible with standard EH12 connecting rod and gudgeon pin specification (check manual for sizes)
- Helps recover power, starting performance and fuel efficiency in worn engines
- Smooth running thanks to tight tolerances that minimise piston slap and vibration
- Suited to demanding site and garden use where reliability and uptime matter
- OEM reference 268-23403-03 for easy cross‐checking during maintenance
Typical Applications:
Used during engine rebuilds or overhauls of the Robin/Subaru EH12 fitted to plate compactors, generators, water pumps, small mixers, pressure washers and similar equipment. Ideal when a cylinder has been rebored to +0.50 mm (≈ +0.020 in) and requires matching components to restore correct clearances and reliable compression.
Also known as:
EH12 0.50 mm oversize piston, 0.50 OS piston for Robin/Subaru EH12, EH12 replacement piston +0.50, Subaru‐Robin EH12 o/s piston, oversize engine piston for EH12.
Fits Models:
EH12
Alternate Part Numbers:
268-23403-03, 2682340303
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