The Honda 90403-ZA1-003 Washer is a genuine OEM replacement designed for a wide range of Honda engines, power equipment, and outdoor power machines. This washer is listed for vertical shaft engines including the GXV270, GXV340, and GXV390, horizontal shaft engines including the GX360, G300, and G400, generators including the EMS4000, EMS4500, ES4500, ES6500, EV4000, and EX5500, the FR700 tiller, and riding mowers and lawn tractors including the H1011, H2013, H3011, H3013, H4013, H4514, HT3810, HT3813, and HT4213. As a genuine Honda OEM part, it carries the same specification as the original hardware and is the correct choice for authorized service and owner repairs. Always verify your machine's serial number against the fitment table before ordering, as Honda updates parts at specific serial breaks.
Key Features
- Genuine Honda OEM Hardware — sourced directly from Honda, this washer meets the same original specification as the part it replaces, ensuring consistent performance in every application.
- Broad Cross-Application Fitment — listed for horizontal and vertical shaft engines, generators, tillers, riding mowers, and lawn tractors across multiple Honda product families, including the GXV390, GX360, G400, FR700, and ES6500.
- Serial Number Verification Recommended — Honda supersedes hardware at specific production breaks, so confirm your unit's serial number against the fitment table to ensure part number 90403-ZA1-003 is correct for your machine.
- Direct Drop-In Replacement — this washer installs directly in place of the original with no modification, keeping your repair straightforward and your machine back in service quickly.
A washer is a flat, hardened disc placed between a fastener — typically a bolt, nut, or screw — and the surface it bears against. By distributing the clamping load over a larger contact area, it prevents the fastener from pulling through or marring softer material and helps maintain consistent clamping force over time. When a washer is missing, undersized, or distorted, the fastener can work loose under vibration, leading to joint failure or damage to the surrounding components.
Part Details
| Part Number | 90403-ZA1-003 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Washer |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | ES4500, EV4000 | 1294568-9999999 |
| Generator | EMS4000, EMS4500, ES6500, EX5500 | All |
| Horizontal Shaft Engine | G300 | 1232729-9999999 |
| Horizontal Shaft Engine | G400 | 1294568-9999999 |
| Horizontal Shaft Engine | GX360 | All |
| Lawn Tractor | H2013, H4013, H4514, HT3810, HT3813, HT4213 | All |
| Riding Mower | H1011, H3011, H3013 | All |
| Tiller | FR700 | All |
| Vertical Shaft Engine | GXV340 | 2020475-9999999 |
| Vertical Shaft Engine | GXV270, GXV390 | 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.
