The Honda 13101-ZF6-W01 Piston (STD) is a genuine OEM standard-bore piston designed for GX390 horizontal shaft engines and a wide range of Honda EB, EM, and EU generators. As a factory-original component, this piston is manufactured to the same specifications as the part it replaces, ensuring proper fit within the cylinder bore without the need for machine work beyond a standard hone. This part is confirmed for use with the GX390, EB3800, EB4000, EB5000, EB6500, EB7000, EM3800, EM4000, EM5000, EM6500, EM7000, and EU6500 — verify your unit's serial number against the fitment table before ordering, as Honda updates part numbers at production breaks.
Key Features
- Genuine OEM Bore Accuracy — manufactured to Honda's standard bore dimension, ensuring the correct running clearance between piston and cylinder wall for proper compression sealing and oil control
- Direct-Fit Replacement — drops into the standard-bore cylinder without oversize machining, making this the correct starting point for an engine rebuild on an unworn or freshly honed cylinder
- Broad Fitment — covers the GX390 horizontal shaft engine along with EB, EM, and EU generator models including the EB3800, EB4000, EB5000, EB6500, EB7000, EM3800, EM4000, EM5000, EM6500, EM7000, and EU6500
- Verify Serial Number Before Ordering — Honda supersedes internal engine components at serial breaks; confirm your unit's serial number against the fitment table to ensure part number 13101-ZF6-W01 is correct for your specific engine
- Compression Restoration — a worn piston allows blow-by past the rings, robbing the engine of power and causing oil consumption; replacing it with this OEM piston restores proper cylinder pressure and keeps the engine running at full output
The piston is the reciprocating heart of a four-stroke engine. Driven by combustion pressure, it travels down the cylinder bore to turn the crankshaft and generate power, then rises again to compress the incoming fuel-air charge. Ring grooves machined into the piston carry the compression and oil-control rings that seal the combustion chamber and regulate oil film on the cylinder wall. When a piston wears, cracks, or scores, compression drops, oil consumption rises, and the engine loses the ability to deliver its rated output — symptoms that point directly to an internal engine rebuild using genuine OEM components like this standard-bore piston.
Part Details
| Part Number | 13101-ZF6-W01 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Piston (STD) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EB3800, EB4000, EB5000, EB6500, EM3800, EM4000, EM5000, EM6500 | 4278970-9999999 |
| Horizontal Shaft Engine | GX390 | 1382378-9999999 |
| Inverter Generator | EB7000, EM7000, EU6500 | 4278970-9999999 |
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.
