The Honda 91021-890-000 Needle Bearing is a genuine OEM component designed for a wide range of Honda generators, welder generators, horizontal and vertical shaft engines, and lawn tractors — including the E3500, E4500, EB4000, EM4000, EMS4000, EMS4500, ES3500, ES4500, EV4000, EW170, G400, GV400, and HT3810. As a direct Honda OEM part, this bearing carries the exact specifications Honda engineered into the original design. Confirm your machine's serial number against the fitment table below before ordering, as Honda updates part numbers at serial breaks and this listing covers multiple production variants across several equipment lines.
Key Features
- Genuine OEM Bearing Integrity — sourced directly from Honda, this needle bearing meets the original dimensional and load tolerances specified for each application in the fitment list.
- Broad Equipment Coverage — listed for Honda generators including the E3500, EB4000, EM4000, EMS4500, ES4500, and EV4000, the EW170 welder generator, G400 and GV400 engines, and the HT3810 lawn tractor.
- Direct OEM Replacement — this part replaces the original needle bearing on a like-for-like basis, with no adaptation needed to seat it correctly in supported applications.
- Serial Number Verification Recommended — Honda applies this part number across multiple equipment families and production runs; check your unit's serial number against the fitment table to confirm this is the correct bearing for your machine.
- Smooth Rotation When It Counts — a worn or seized needle bearing increases friction and wear on rotating shafts, leading to heat buildup, noise, and accelerated component damage. Replacing a failed bearing restores smooth, low-friction rotation and protects the surrounding assembly.
A needle bearing uses a series of small-diameter cylindrical rollers arranged around a shaft to carry radial loads with minimal friction across a compact footprint. Because the rollers are long relative to their diameter, the bearing supports significant load without requiring the larger envelope of a ball bearing. In rotating shaft assemblies — such as those found in generators, engines, and tractor drivetrains — this type of bearing allows components to spin freely and accurately under load. When a needle bearing wears, rollers lose their smooth contact surface, causing vibration, shaft play, and heat that can damage the surrounding housing and the components it supports.
Part Details
| Part Number | 91021-890-000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Needle Bearing |
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.
