The Honda 31610-Z5R-821ZB Control Box Assembly (18A) (Power Red) is a genuine OEM component designed for GX340 and GX390 horizontal shaft engines. As a direct OEM replacement, this assembly is manufactured to Honda's exact specifications, ensuring it integrates correctly with the electrical system on your engine. Confirm part number 31610-Z5R-821ZB against your engine's serial number and the fitment table before ordering, as Honda supersedes parts at specific serial breaks.
Key Features
- Genuine OEM Electrical Integrity — sourced directly from Honda, this control box assembly meets the exact current-handling and circuit-protection requirements of the 18A-rated electrical system on GX340 and GX390 engines.
- Variant-Specific Fit — the (18A) rating and Power Red color designation identify this as a specific version of the control box assembly; match both identifiers to your engine before ordering to confirm this is the correct unit for your application.
- Serial Number Verification Recommended — Honda updates electrical components at defined production breaks, so cross-check your engine's serial number against the fitment table to ensure this assembly corresponds to your engine's build.
- Correct Amperage Rating Matters — installing a control box with the wrong current rating can affect circuit protection; using the correctly rated OEM assembly keeps the electrical system operating as Honda designed it.
The control box assembly houses and protects the electrical control circuitry that manages power distribution on the engine. On GX340 and GX390 horizontal shaft engines equipped with an electric start or charging system, this assembly governs how current is routed and regulated, keeping connected components supplied with the correct power levels. When the control box fails or is damaged, the electrical system can become unreliable — leading to starting problems, charging faults, or loss of function in electrically driven accessories on the equipment the engine powers.
Part Details
| Part Number | 31610-Z5R-821ZB |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Control Box Assembly (18A) (Power Red) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX340, 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.
Honda
Honda 31610-Z5F-821ZB Control Box Assembly (EXP-Alert/18A) (Power Red)
