The Honda 13103-ZF6-000 Piston (0.50) is a genuine OEM oversized piston designed for GXV390 vertical shaft engines and the Honda H-series lawn tractors, riding mowers, multi-purpose tractors, and commercial mowers that run them, including the H2013, H2113, H3011, H3013, H4013, H5013, HRC7013, and RT5000. As a factory-original component, this piston is manufactured to Honda's own dimensional specifications for the 0.50 mm oversize bore — making it the correct choice for engines that have been bored out to that spec during a rebuild. Confirm the bore size of your engine before ordering, as this oversized piston is a specific variant and must match the machined cylinder bore exactly.
Key Features
- Genuine OEM Oversize Fit — sourced directly from Honda, this piston is dimensioned to the 0.50 mm oversize specification, ensuring correct bore-to-piston clearance after a cylinder rebore
- Bore Sealing and Compression Retention — a correctly sized piston maintains proper ring seating and combustion sealing; an undersized or worn piston leads to blow-by, oil consumption, and lost compression
- Broad Fitment Across GXV390-Powered Equipment — fits GXV390 engines across the H2013, H2113, H3011, H3013, H4013, H5013, HRC7013, and RT5000, including lawn tractors, riding mowers, multi-purpose tractors, and commercial mowers
- Verify Your Bore Size Before Ordering — Honda supersedes and variants piston sizes at rebuild intervals; confirm your cylinder has been bored to the 0.50 mm oversize before purchasing this part
The piston is the reciprocating heart of a four-stroke engine, traveling up and down inside the cylinder bore to compress the air-fuel mixture and transfer combustion force to the crankshaft. It must fit the bore precisely — too loose and combustion gases escape past the rings, robbing the engine of power and pushing oil into the combustion chamber; too tight and the piston can seize. An oversize piston like this one is used when the original cylinder bore has been worn beyond its serviceable limit and machined to a larger, standard oversize dimension to restore a true, round bore surface. Fitting the correct oversize piston returns proper compression, oil control, and long-term engine reliability to a rebuilt GXV390.
Part Details
| Part Number | 13103-ZF6-000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Piston (0.50) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Commercial Mower | HRC7013 | All |
| Lawn Tractor | H2013, H2113, H4013 | All |
| Multi-Purpose Tractor | H5013, RT5000 | All |
| Riding Mower | H3011, H3013 | All |
| Vertical Shaft Engine | GXV390 | All |
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.
