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Yamaha WR250F WR450F Voltage Regulator Rectifier | Replaces 5UM-81960-E0
Yamaha WR250F WR450F Voltage Regulator Rectifier | Replaces 5UM-81960-E0
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Product Overview
Restore stable charging performance with this voltage regulator rectifier, designed for selected Yamaha WR250F and WR450F applications.Built to replace OEM 5UM-81960-E0, this unit helps solve common issues such as battery not charging, unstable voltage, dim or flickering lights, weak electrical output, and intermittent charging failure. It is designed to help dissipate excess voltage, improve charging capability, and reduce the risk of battery overcharging.This regulator rectifier uses a half-wave design with a 1+3 male plug layout and is intended as a direct replacement for correctly matched applications. Its replacement-style construction is designed for stable performance, reliable current control, and practical installation.
Product Compatibility
| Brand | Model | Engine / HP / CC | Year Range | Notes |
|---|---|---|---|---|
| Yamaha | WR250F | 250cc | 2007–2014 | Please verify connector style and original part before purchase |
| Yamaha | WR450F | 450cc | 2007–2011 | Please verify connector style and original part before purchase |
OEM Cross Reference:
5UM-81960-E0, 5UM-81960-E0-00
Specifications
| Specification | Details |
|---|---|
| Part Type | Voltage Regulator Rectifier |
| Rectifier Type | Half-Wave |
| Plug Layout | 1+3 Male Plug |
| Yellow Headlight Voltage | 13V ± 0.5V |
| Red Battery Charging Voltage | 14.5V ± 0.5V |
| Control Current | 8A |
| Mounting Hole Pitch | 60 mm / 2.4" |
| Length | 74 mm / 2.9" |
| Width | 43 mm / 1.7" |
| Thickness | 18 mm / 0.71" |
| Fitment Method | Match by OEM number, connector style, and original part layout |
| Condition | 100% New Aftermarket |
Key Features
- Half-Wave Charging Design – Built for selected WR charging-system applications
- Stable Voltage Regulation – Helps maintain reliable battery charging and electrical output
- Direct Replacement Fit – Designed for straightforward installation on correctly matched applications
- Overcharge Protection – Helps dissipate excess voltage and reduce battery overcharging risk
- Compact Replacement Layout – Built to match the OEM-style regulator family for supported models
Common Problems This Part Can Help Solve
This product may help address issues such as:
- Battery not charging
- Overcharging or unstable voltage
- Dim or flickering lights
- Weak electrical output
- Intermittent charging failure
- Regulator overheating or voltage-control issues
Package Includes
1 × Voltage Regulator Rectifier
Fitment Note
Please confirm your OEM part number, connector style, mounting-hole spacing, and original part layout before ordering.
If you are unsure about compatibility, contact us with your model, year, OEM number, and original part photos before purchase.
Installation Note
Professional installation is recommended.
Before installation, inspect related components such as the battery, stator, wiring harness, connectors, and charging system to avoid repeat failure caused by another faulty part.
Why Choose This Replacement
A failing regulator rectifier can lead to poor charging performance, unstable voltage, dim lighting, and unreliable electrical operation. Replacing it with a properly matched unit helps restore dependable charging-system performance and keeps your WR ready for regular riding.
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