The Honda 31110-Z7E-821 Flywheel (SEL-LAMP) is a genuine OEM component designed for Honda EM3800, EM4000, EM5000, and EM6500 generators. As a direct Honda OEM part, it is manufactured to the same standards as the original and restores correct generator operation without modification. Confirm your generator's serial number against the fitment table before ordering, as Honda supersedes flywheel assemblies at specific serial breaks across the EM series.
Key Features
- Genuine Honda OEM Construction — sourced directly from Honda, this flywheel carries the correct winding geometry and lamp exciter configuration for the EM-series generator's charging and ignition circuits, ensuring the SEL-LAMP function operates as originally built
- Direct OEM Replacement — engineered as an exact replacement for the original flywheel assembly, this part installs without alteration on compatible EM3800, EM4000, EM5000, and EM6500 generators
- Serial Number Verification Recommended — Honda updates flywheel specifications at production serial breaks; always cross-reference your generator's serial number with the fitment table to confirm part number 31110-Z7E-821 is correct for your unit
- Restores Charging and Excitation Performance — a worn or damaged flywheel can cause erratic output voltage, charging failures, or a non-functioning SEL lamp indicator; replacing it with this OEM part brings those systems back to correct operation
The flywheel is a heavy rotating disc mounted to the crankshaft of the generator engine. Its mass smooths out the power pulses from combustion, keeping the engine running evenly and the generator's output stable. On EM-series generators equipped with the SEL-LAMP system, the flywheel also carries the magnets and exciter windings that feed the charging and low-oil indicator circuits — meaning a failed or incorrect flywheel can affect not only engine smoothness but also the generator's voltage regulation and warning lamp function. When a flywheel cracks, loses a magnet, or the exciter winding degrades, the result is typically unstable AC output, a dead oil-alert lamp, or difficulty maintaining engine speed under load.
Part Details
| Part Number | 31110-Z7E-821 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Flywheel (SEL-LAMP) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EM3800, EM4000, EM5000, EM6500 | 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.
