The Honda 13103-ZN1-010 is a genuine OEM Piston (0.50) designed for GX670 horizontal shaft engines and GXV670 vertical shaft engines. As an oversize piston — 0.50 mm above standard bore — this component is intended for engines that have been bored out during a rebuild to correct cylinder wear, scoring, or taper. Verify your cylinder bore measurement against this oversize designation before ordering, and confirm fitment using the serial number on your machine against the compatibility table.
Key Features
- Genuine OEM Oversize Specification — manufactured to Honda's exact 0.50 mm oversize dimension, ensuring the correct piston-to-wall clearance in a bored cylinder for proper compression sealing and oil control
- Correct Orientation for Your Engine — this piston is listed for both the GX670 horizontal shaft engine and the GXV670 vertical shaft engine; confirm your specific engine orientation and bore size before purchasing, as crankshaft orientation determines the correct piston pin and skirt geometry
- Serial Number Verification Recommended — Honda supersedes internal engine components at production breaks, so check your engine's serial number against the fitment table to confirm part number 13103-ZN1-010 is correct for your unit
- Rebuild Accuracy — using the correct oversize piston restores compression, reduces blow-by, and brings oil consumption back within spec after a bore job; an incorrect oversize will result in either excessive clearance or an interference fit
The piston is the reciprocating heart of a four-stroke engine, converting the force of combustion into the rotational energy delivered to the crankshaft. As it travels up and down inside the cylinder bore, it must maintain a precise clearance with the cylinder wall — tight enough to seal combustion gases above it and control oil below it, yet free enough to move without friction damage. When a cylinder bore wears beyond its service limit, it is machined oversize to restore a true, round surface, and an oversize piston — such as this 0.50 mm unit — is fitted to match. Running a worn piston in a tired bore results in lost compression, excessive oil consumption, and hard starting; fitting the correct oversize piston during a rebuild restores the engine to sound working condition.
Part Details
| Part Number | 13103-ZN1-010 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Piston (0.50) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX670 | 1037872-9999999 |
| Vertical Shaft Engine | GXV670 | 1002341-9999999 |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
