The Honda 13104-890-010 Piston (0.75) is a genuine OEM replacement designed for a wide range of Honda generators, engines, and equipment including E3500, E4500, EB4000, EM4000, EMS4000, EMS4500, ES3500, ES4500, EV4000 generators, the EW170 welder generator, G400 horizontal shaft engines, GV400 vertical shaft engines, and HT3810 lawn tractors. As a genuine Honda part, this piston is manufactured to the same specification as the original, ensuring correct bore sizing and ring groove geometry. The 0.75 oversize designation is a critical detail — this piston is intended for engines whose cylinder bore has been measured and machined to the corresponding oversize, so buyers should confirm their bore specification before ordering. Genuine OEM sourcing means no guesswork on dimensional accuracy or material consistency.
Key Features
- Oversize Bore Fitment — the (0.75) designation identifies this as an oversize piston; it is engineered for a cylinder bore that has been honed or machined to the matching 0.75 mm oversize, not a standard bore
- Genuine Honda OEM Part — manufactured to Honda's original specifications for correct ring groove depth, skirt profile, and pin bore geometry, delivering the dimensional accuracy a rebuild demands
- Broad Compatibility — fits E3500, E4500, EB4000, EM4000, EMS4000, EMS4500, ES3500, ES4500, EV4000 generators, the EW170 welder generator, G400 horizontal shaft engines, GV400 vertical shaft engines, and the HT3810 lawn tractor; always verify your serial number against the fitment table, as Honda supersedes parts at serial breaks
- Verify Oversize Before Ordering — because multiple oversize pistons exist for these applications, confirm the bore has been machined to the 0.75 mm oversize before selecting this part over a standard or alternate oversize option
The piston is the reciprocating component at the heart of the combustion cycle. It travels up and down inside the cylinder bore, compressing the air-fuel mixture on the upstroke and transmitting the force of combustion 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 compression where it belongs and preventing oil consumption. When a piston is worn, scored, or sized incorrectly for the bore, the engine will suffer low compression, excessive oil burning, rough running, and difficulty starting — symptoms that only a correctly sized replacement piston can resolve.
Part Details
| Part Number | 13104-890-010 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Piston (0.75) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | E3500, E4500, EB4000, EM4000, EMS4000, EMS4500, ES3500, ES4500, EV4000 | All |
| Horizontal Shaft Engine | G400 | All |
| Lawn Tractor | HT3810 | All |
| Vertical Shaft Engine | GV400 | All |
| Welder Generator | EW170 | 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.
