The Honda 13102-ZE1-010 Piston (0.25) is a genuine OEM oversize piston designed for a wide range of Honda equipment, including GX140 horizontal shaft engines, WT30 and WB30 water pumps, HS521 and HS622 snow blowers, F401 and F501 tillers, and multiple Honda generator models. As a genuine Honda part, it is manufactured to the same tolerances as the original, ensuring a proper fit in a rebored or honed cylinder. The 0.25 mm oversize designation means this piston is intended for engines whose cylinders have been machined beyond the standard bore — confirm your cylinder's rebore dimension before ordering to ensure this is the correct size for your application.
Key Features
- Genuine OEM Oversize Piston — manufactured by Honda to match the original bore geometry, ring-groove dimensions, and wrist-pin clearances required for correct engine assembly after a cylinder rebore
- 0.25 mm Oversize — the (0.25) designation identifies this as a specific variant; verify your cylinder's machined bore size against this specification before purchasing, as installing the wrong oversize will result in improper clearance
- Broad Honda Fitment — covers GX140 horizontal shaft engines, WA20, WA30, WB20, WB30, WD20, WD30, WH15, WH20, WT20 and WT30 water pumps, EB2200 and EB2500 generators, EG1400, EG2200, EG2500, EM1600, EM1800, EM2200, EM2500 and EX2200 generators, HS521, HS522, HS55, HS621 and HS622 snow blowers, and F401 and F501 tillers
- Check Your Serial Number — Honda supersedes parts at serial number breaks; confirm part number 13102-ZE1-010 against your machine's serial number in the fitment table before completing your order
- Engine Compression Restoration — a correctly sized oversize piston, paired with properly fitted rings, restores cylinder sealing after wear or damage, returning compression and power output to specification
The piston is the reciprocating component inside the engine cylinder that transfers combustion pressure to the connecting rod and crankshaft, converting the force of ignition into rotational power. It works in close concert with the piston rings to seal combustion gases above and control oil below, maintaining the compression necessary for reliable starting and full power output. When a cylinder bore wears beyond the serviceable limit, the bore is machined oversize and a matching oversize piston — such as this 0.25 mm unit — is installed to restore the correct running clearance between piston and cylinder wall; fitting the wrong oversize or a standard piston into a rebored cylinder results in poor compression, excessive oil consumption, or engine damage.
Part Details
| Part Number | 13102-ZE1-010 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Piston (0.25) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EB2500, EG1400, EG2200, EG2500, EM1600, EM1800, EM2200, EM2500, EX2200 | 2120318-9999999 |
| Horizontal Shaft Engine | GX140 | 2120318-9999999 |
| Inverter Generator | EB2200 | 2120318-9999999 |
| Single-Stage Snow Blower | HS521, HS621 | All |
| Tiller | F401, F501 | 2120318-9999999 |
| Two-Stage Snow Blower | HS522, HS622 | 2120318-9999999 |
| Two-Stage Snow Blower | HS55 | 2582393-9999999 |
| Water Pump | WA20, WA30, WB20, WB30, WD20, WD30, WH15, WH20 | 2120318-9999999 |
| Water Pump | WT20, WT30 | 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.
