The Honda 13101-Z3E-000 Piston (STD) is a genuine OEM standard-bore piston designed for GX25 horizontal shaft engines, the FG110 tiller, WX10 water pumps, and HHT25, UMC425, and UMC435 trimmers. As a Honda OEM component, this piston is manufactured to the exact dimensions Honda specifies for these small-displacement powerheads, ensuring proper ring-groove geometry, pin-bore alignment, and compression height. Verify your engine's bore condition before installation — a standard piston is the correct choice only when the cylinder has not been bored oversize.
Key Features
- Genuine OEM Dimensional Accuracy — machined to Honda's exact bore diameter and compression height for the GX25 family, so ring seal and piston-to-wall clearance are correct from the first start.
- Standard Bore Specification — this is the STD piston, sized for an unworn or factory-dimension cylinder bore; always measure the bore before ordering to confirm standard sizing is appropriate for your engine.
- Direct-Fit Replacement — engineered to drop into the GX25-based powerhead shared across the FG110 tiller, WX10 water pump, HHT25, UMC425, and UMC435 trimmers with no machining required.
- Serial Number Verification Recommended — Honda supersedes parts at production breaks, so confirm your unit's serial number against the fitment table before finalizing your order.
- Compression and Performance Restoration — a worn or scuffed piston allows combustion pressure to bypass the rings, causing hard starting, low power, and excessive oil consumption; replacing it with this part restores proper compression and clean combustion in the engine.
The piston is the reciprocating heart of a four-stroke engine. It travels up and down inside the cylinder bore, compressing the air-fuel mixture on the upstroke and transmitting combustion force to the crankshaft via the connecting rod on the power stroke. The piston rings seated in its grooves seal combustion gases above and control oil below, keeping the engine efficient and oil consumption low. When a piston wears, scores, or cracks, compression drops, power falls off noticeably, and oil begins to burn — symptoms that replacing this component directly addresses.
Part Details
| Part Number | 13101-Z3E-000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Piston (STD) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX25 | All |
| Tiller | FG110 | All |
| Trimmer | HHT25, UMC425, UMC435 | All |
| Water Pump | WX10 | 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.
