The Honda 90206-ZM3-000 Tappet Adjusting Nut is a genuine OEM component designed for a wide range of Honda mini 4-stroke engines and outdoor power equipment, including GX22, GX25, GX31, GX35, and GX50 horizontal shaft engines, FG100 and FG110 tillers, WX10 water pumps, HHE31 stick edgers, and HHT25, HHT31, HHT35, UMC425, UMC435, UMK422, and UMK431 trimmers. As a direct OEM replacement sourced from Honda, this nut is manufactured to the exact specification required for proper valve adjustment across every compatible application. Confirm your unit's serial number against the fitment table before ordering, as Honda periodically revises parts at production breaks.
Key Features
- Genuine OEM Valve-Train Precision — manufactured by Honda to hold the correct valve clearance setting under the heat and vibration of small-displacement 4-stroke operation, where even slight dimensional variation throws off tappet adjustment.
- Broad Cross-Equipment Fitment — listed for Honda GX22, GX25, GX31, GX35, and GX50 engines, FG100 and FG110 tillers, WX10 water pumps, HHE31 edgers, and the HHT and UMC/UMK trimmer lines, including HHT25, HHT31, HHT35, UMC425, UMC435, UMK422, and UMK431.
- Direct OEM Replacement — matches the original nut in thread pitch and geometry, allowing a straightforward swap during routine valve-clearance service with no rework of the rocker assembly.
- Verify Serial Number Before Ordering — Honda supersedes hardware at production breaks across this many platforms; check your machine's serial number against the fitment table to confirm part number 90206-ZM3-000 is correct for your specific unit.
The tappet adjusting nut is the locking element of the valve clearance adjustment screw on an overhead-valve or overhead-cam engine. After the rocker arm clearance is set to specification with the adjustment screw, this nut is tightened against the rocker arm or rocker bracket to lock that setting in place. If the nut is worn, cross-threaded, or has lost its ability to hold torque, the adjustment screw can migrate under engine vibration, causing valve clearance to drift out of spec. The result is hard starting, rough idle, reduced power, or accelerated valve-seat wear — any of which is a common symptom on small Honda engines that have accumulated service hours without a valve adjustment check.
Part Details
| Part Number | 90206-ZM3-000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Tappet Adjusting Nut |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX22, GX25, GX31, GX35, GX50 | All |
| Stick Edger | HHE31 | All |
| Tiller | FG100, FG110 | All |
| Trimmer | HHT25, HHT31, HHT35, UMC425, UMC435, UMK422, UMK431 | All |
| Water Pump | WX10 | 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.
