Honda XL125 XL125S CB125 CB125S 6 Pin Voltage Regulator Rectifier | Replaces 31600-437-971

Product Overview

Restore stable charging performance with this 6 pin voltage regulator rectifier, designed for selected Honda XL125, XL125S, CB125, and CB125S applications.

Built to replace OEM 31600-437-971, this unit helps solve common charging-system issues such as battery not charging, unstable voltage, dim or flickering lights, weak electrical output, and intermittent charging failure.

Made with high-quality replacement materials, this regulator rectifier is designed to provide stable voltage control, improve charging capability, and help protect the battery from overcharging. Its compact design and direct-fit layout make it a practical replacement for correctly matched Honda 125cc motorcycle applications.

Product Compatibility

Brand	Model	Engine / HP / CC	Year Range	Notes
Honda	XL125	125cc	1985	Verify OEM number and connector style before purchase
Honda	XL125S	125cc	1985	Verify OEM number and connector style before purchase
Honda	CB125	125cc	1984–1985	Verify OEM number and connector style before purchase
Honda	CB125S	125cc	1984–1985	Verify OEM number and connector style before purchase

OEM Cross Reference:
31600-437-971

Specifications

Specification	Details
Part Type	Voltage Regulator Rectifier
Configuration	6 Pin
Mounting Hole Distance	6.3 mm / 0.25"
Length	44.4 mm / 1.75"
Width	33 mm / 1.3"
Wire Length	170 mm / 6.7"
Fitment Method	Match by OEM number, connector style, and original part layout
Material	High-quality replacement construction
Function	Voltage regulation and rectification
Condition	100% New Aftermarket

Key Features

• 6 Pin Replacement Design – Built for selected Honda 125cc motorcycle charging systems
• Stable Voltage Regulation – Helps maintain reliable battery charging and electrical output
• Overcharge Protection – Helps reduce the risk of battery damage from excessive voltage
• Compact Direct-Fit Layout – Designed for straightforward replacement when the connector matches
• Durable Construction – Lightweight, anti-rust, colorfast, and built for long-term use

Common Problems This Part Can Help Solve

This product may help address issues such as:

• Battery not charging
• Battery overcharging
• Dim or flickering lights
• Unstable charging voltage
• Weak electrical output
• Intermittent charging failure

Package Includes

1 × 6 Pin Voltage Regulator Rectifier

Fitment Note

Please confirm your OEM part number, connector style, mounting layout, wire length, and original part appearance before ordering.

If you are unsure about compatibility, contact us with your model, year, connector photos, 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, battery problems, and unreliable electrical operation. Replacing it with a properly matched unit helps restore dependable charging-system performance and keeps your Honda 125cc motorcycle ready for daily riding.