The Honda 13103-822-000 Piston (0.50) is a genuine OEM oversize piston designed for E1500, EG1500, and ER1500 generators and the G42 horizontal shaft engine. As an OEM component, this piston is manufactured to Honda's original tolerances, ensuring correct fit within the cylinder bore when used as part of an oversize rebuild. Honda supersedes parts at serial breaks, so confirm your machine's serial number against the fitment table before ordering — this is especially important with oversize pistons, where bore sizing must match the actual machined cylinder. This part is the right choice when an engine has been re-bored to the 0.50 mm oversize specification and a matching replacement piston is needed to restore compression and power.
Key Features
- Oversize Bore Fitment — sized at 0.50 mm over standard, this piston is intended for use after cylinder re-boring to that specification; pairing it with a standard-bore cylinder will result in incorrect fit
- Genuine OEM Construction — manufactured by Honda to the same dimensional standards as the original, ensuring correct ring land geometry and pin bore alignment for proper piston ring sealing and oil control
- Broad Generator and Engine Coverage — fits E1500, EG1500, and ER1500 generators as well as G42 horizontal shaft engines; always verify your serial number against the fitment table, as Honda parts can change at production breaks
- Compression Restoration — a worn or damaged piston allows combustion pressure to bypass the rings, causing loss of power, increased oil consumption, and hard starting; this replacement restores the tight bore-to-piston clearance the engine needs to run correctly
The piston is the reciprocating component inside the engine cylinder that transfers combustion pressure into crankshaft rotation. It works in conjunction with the piston rings to seal the combustion chamber and prevent oil from entering it from below. When a piston is worn, scored, or the cylinder has been re-bored to correct such damage, an oversize piston — sized to match the new bore dimension — is required to restore the correct running clearance. Installing the right oversize ensures proper compression, efficient combustion, and controlled oil consumption across the engine's operating range.
Part Details
| Part Number | 13103-822-000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Piston (0.50) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | E1500, EG1500, ER1500 | All |
| Horizontal Shaft Engine | G42 | 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.
