The Honda 13101-ZE2-W01 Piston (STD) is a genuine OEM standard-bore piston designed for GX240 horizontal shaft engines, EB, EM, and EG generators, WT20 and WT30 water pumps, and the FRC800 tiller. As a direct Honda OEM component, this piston is manufactured to the same specifications as the original, making it the correct choice for a standard-bore rebuild when no oversize machining has been performed. This part fits an extensive range of Honda equipment — confirm your unit's serial number against the fitment table before ordering, as Honda supersedes piston part numbers at serial breaks.
Key Features
- Genuine OEM Piston — sourced directly from Honda, this piston meets the original bore diameter, crown profile, and ring-groove dimensions specified for the engine family it serves
- Standard Bore Fitment — the STD designation means this piston is sized for a cylinder that has not been bored oversize; it is the correct selection when the bore is within Honda's standard wear tolerance
- Broad Equipment Coverage — fits GX240 horizontal shaft engines, EB3500, EB3800, EB4000, EB5000, EB6500, EG3500, EM3500, EM3800, EM4000, EM5000, and EM6500 generators, WT20 and WT30 water pumps, and the FRC800 tiller
- Serial Number Verification Recommended — Honda issues piston supersessions at defined serial breaks; check your machine's serial number against the compatibility table to confirm this is the correct part for your specific unit
- Restore Lost Compression — a worn piston allows blow-by past the rings, robbing the engine of compression and power; replacing it with this OEM component restores proper cylinder sealing and full engine output
The piston is the reciprocating heart of a four-stroke engine. Driven down by combustion pressure, it converts the force of burning fuel into rotational motion at the crankshaft, which in turn powers the equipment — whether that is a generator producing electrical output, a water pump moving water, or a tiller working soil. The piston also works in concert with its ring set to seal the combustion chamber: when the piston skirt or ring grooves wear, compression drops, oil consumption rises, and the engine loses the power needed to drive its load. Replacing a worn piston with part number 13101-ZE2-W01 restores the tight clearances that keep the engine running at full output.
Part Details
| Part Number | 13101-ZE2-W01 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Piston (STD) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EB3500, EB3800, EB4000, EB5000, EB6500, EG3500, EM3500, EM3800, EM4000, EM5000, EM6500 | 4869815-9999999 |
| Horizontal Shaft Engine | GX240 | All |
| Tiller | FRC800 | 4869815-9999999 |
| Water Pump | WT20, WT30 | 4869815-9999999 |
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.
