The Honda 13101-ZG8-000 Piston (Standard) is a genuine OEM replacement designed for GX640 horizontal shaft engines, H4518 lawn tractors, and H5518 multi-purpose tractors. As a standard-bore piston, this part is the correct choice for engines that have not been rebored and retain their original cylinder dimensions — always verify your cylinder bore condition and serial number against the fitment table before ordering. Sourced directly from Honda, this component delivers the exact geometry and tolerances Honda specifies for these engines.
Key Features
- Genuine Honda OEM Component — manufactured to Honda's original specifications, ensuring the correct bore diameter, crown profile, and ring-groove dimensions for the GX640 engine family.
- Standard Bore Fitment — sized for engines at original factory bore; confirm your cylinder has not been bored oversize before selecting this standard piston.
- Broad Equipment Coverage — fits GX640 horizontal shaft engines as well as H4518 lawn tractors and H5518 multi-purpose tractors; verify your serial number against the fitment table to confirm applicability to your specific unit.
- Compression and Power Restoration — a worn or damaged piston allows combustion pressure to bypass the rings, causing loss of power, increased oil consumption, and hard starting; replacing it with this OEM piston restores proper cylinder sealing and engine output.
The piston is the reciprocating heart of the combustion cycle — 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 crankshaft via the connecting rod on the power stroke. The piston rings seated in its grooves seal combustion pressure above and control oil film below, keeping the engine running cleanly and efficiently. When a piston wears, cracks, or scores, compression drops, oil burns in the combustion chamber, and the engine loses the power and smooth running that equipment operators depend on — making a correct-specification replacement essential to restoring full performance.
Part Details
| Part Number | 13101-ZG8-000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Piston (Standard) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX640 | All |
| Lawn Tractor | H4518 | All |
| Multi-Purpose Tractor | H5518 | 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.
