The Honda 13101-Z4M-000 Piston (Standard) is a genuine OEM component designed for GX160 horizontal shaft engines and WMP20 water pumps. As a direct Honda OEM part, it is manufactured to the same specifications as the original, ensuring a correct bore fit right out of the box. This standard-bore piston is the right choice when the cylinder has not been bored oversize — confirm your bore condition before ordering. Buyers should verify their unit's serial number against the fitment table, as Honda supersedes parts at production breaks and this piston applies to specific serial ranges within those models.
Key Features
- Genuine OEM Bore Fit — manufactured by Honda to match the original bore diameter exactly, ensuring correct ring land geometry and piston-to-wall clearance for proper sealing and compression.
- Standard Bore Only — this is the standard-dimension piston; it is the correct choice when the cylinder bore has not been machined oversize. Verify your bore size before selecting this part.
- Broad Fitment — suits GX160 horizontal shaft engines and WMP20 water pumps, covering a wide range of equipment powered by these Honda units.
- Serial Number Verification Recommended — Honda updates piston specifications at production serial breaks, so always cross-reference your machine's serial number with the fitment table to confirm this is the right part for your unit.
- Compression and Power Restoration — a worn or damaged piston allows blow-by past the rings, resulting in lost compression, increased oil consumption, and rough running; replacing it with part number 13101-Z4M-000 restores proper cylinder pressure and smooth operation.
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 transferring the force of combustion to the connecting rod and crankshaft on the power stroke. When a piston wears, cracks, or scores, compression drops, oil can enter the combustion chamber, and the engine loses power or begins to smoke. Fitting a correctly sized replacement piston — matched to the original bore — restores the tight seal the rings depend on and returns the engine to full working condition.
Part Details
| Part Number | 13101-Z4M-000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Piston (Standard) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX160 | 2805810-9999999 |
| Water Pump | WMP20 | 4199742-9999999 |
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.
