The Honda 90401-Z1C-791 Thrust Washer (35MM) is a genuine OEM component designed for GX390 horizontal shaft engines. Sourced directly from Honda, this washer matches the original specification exactly, ensuring correct axial load management without the guesswork of non-OEM alternatives. Honda supersedes parts at serial breaks, so confirm your engine's serial number against the fitment table before ordering to make sure part number 90401-Z1C-791 is the right version for your unit.
Key Features
- Genuine OEM Sourcing — supplied directly by Honda, this washer matches the original dimension and load rating the GX390 engine was built around
- Correct 35MM Sizing — the (35MM) designation identifies this specific variant; verify it against your engine's parts diagram to confirm you have the right washer
- GX390 Fitment — listed for GX390 horizontal shaft engines; check your serial number against the fitment table, as Honda issues updated part numbers at certain serial breaks
- Axial Load Control — a correctly sized thrust washer keeps rotating components properly located along the shaft axis; wear or the wrong size allows unwanted end-play that accelerates bearing and crankshaft wear
A thrust washer manages axial (end-to-end) forces on a rotating shaft, sitting between two surfaces to absorb the load and maintain the correct running clearance. In a GX390 engine, this keeps critical rotating components properly positioned so they spin freely without excessive movement along the shaft axis. When a thrust washer wears thin or is the wrong size, end-play increases, which can lead to accelerated wear on adjacent bearings and internal components — making this a small part with a meaningful impact on long-term engine health.
Part Details
| Part Number | 90401-Z1C-791 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Thrust Washer (35MM) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX390 | 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.
