The Honda 13012-ZG9-004 Piston Ring Set (0.50) is a genuine OEM oversize piston ring set designed for the GXV140 vertical shaft engine and a wide range of Honda HR-series and HRM-series lawn mowers. As a direct Honda OEM component, this ring set is manufactured to the same specifications as the original, ensuring a correct match to bore geometry and ring groove dimensions. The (0.50) designation identifies this as a 0.50 mm oversize set intended for engines that have been bored out during a rebuild — confirm your engine's bore size before ordering. This set is compatible with the GXV140 engine as fitted to the HR195, HR215, HRA215, HRB215, HRC215, HRC216, HRM195, and HRM215 lawn mowers; always cross-reference your machine's serial number against the fitment table to confirm the correct part for your serial range.
Key Features
- OEM Bore Sealing and Oil Control — genuine Honda rings are sized and tensioned to restore compression and control oil consumption in a freshly bored cylinder, maintaining the sealing performance the engine was originally built to deliver.
- Oversize Designation (0.50) — the (0.50) suffix identifies this as a 0.50 mm oversize ring set for use after cylinder boring; using the correct oversize ensures proper ring-to-wall clearance.
- Broad Honda Lawn Mower Fitment — engineered for the GXV140 engine as used in the HR195, HR215, HRA215, HRB215, HRC215, HRC216, HRM195, and HRM215 lawn mowers, covering a wide span of Honda walk-behind mower platforms.
- Serial Number Verification Recommended — Honda updates parts at production serial breaks, so confirm your engine's serial number against the fitment table to ensure this is the correct ring set for your unit.
Piston rings seal the combustion chamber between the piston and the cylinder wall, maintaining compression while preventing combustion gases from escaping into the crankcase. They also regulate oil by scraping excess lubricant off the cylinder wall on the downstroke, returning it to the sump. When rings wear, lose tension, or are damaged, the engine suffers reduced compression, increased oil consumption, and a loss of power — symptoms that often point to a rebuild being overdue. Replacing the ring set with a correctly sized OEM piston ring set during a bore-and-rebuild restores the original sealing efficiency and extends the usable life of the engine.
Part Details
| Part Number | 13012-ZG9-004 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Piston Ring Set (0.50) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Lawn Mower | HR195, HR215, HRA215, HRB215, HRC215, HRC216, HRM195, HRM215 | All |
| Vertical Shaft Engine | GXV140 | 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.
