This is a brand new aftermarket voltage regulator rectifier built to replace the original charging system regulator on the Yamaha YFZ 450 sport quad. The regulator rectifier converts the alternating current produced by the stator into the direct current your battery and electronics need, and it holds that output at a steady level so the battery is neither undercharged nor cooked. When it fails you typically see a flat or boiling battery, dimming lights, or a machine that runs only until the battery is drained.
The unit is a direct replacement for the original part. It is plug-and-play, a direct fit, and needs no assembly or wiring modification. It is built with a higher grade of electrical components than the original equipment and every unit is tested before it is shipped. Because the original connector on this model is very often melted or corroded, the opposite connector for the main harness side is supplied with the regulator so you can renew both halves of the joint at the same time.
Key Features
- Direct replacement for the original unit - plug-and-play, direct fit, easy installation
- No assembly or harness modification required
- Higher grade of electrical components than the original equipment
- Improved heat sink and charging capability
- Opposite connector for the main harness side included
- Every unit is tested before shipping
- Four wires, four pins, single plug
Technical Specs
| Specification |
Detail |
| Manufacturer Part Number |
RM30107 |
| Width |
63 mm |
| Length |
78 mm |
| Height |
26 mm |
| Wire Length |
140 mm |
| Fixation Hole Distance |
60 mm centre to centre |
| Number of Plugs |
1 |
| Number of Pins |
4 |
| Number of Wires |
4 |
| Minimum Charging Voltage |
14.5 V +/- 0.5 V |
| Maximum Charging Current |
25 A / 300 W |
| Open Circuit Voltage |
Under 15 V |
| Operating Temperature |
-20 C to 85 C |
Vehicle Fitment Guide
| Make & Model |
Years |
| Yamaha YFZ 450 |
2004-2009 |
| Yamaha YFZ 450 |
2012 and 2013 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 5TG-81960-00-00 |
Yamaha |
| 1PD-81960-00-00 |
Yamaha |
Frequently Asked Questions
Will this fit without modifying my wiring?
Yes. This is a direct fit, plug-and-play replacement for the original unit on the listed models. No assembly and no harness modification are required. The mounting holes are 60 mm apart centre to centre, matching the original bracket.
What is included?
You receive the voltage regulator rectifier with its 140 mm wiring lead and plug, plus the opposite connector for the main harness side. That spare connector is supplied because the original ones on this machine are frequently melted or corroded.
How do I know my old regulator rectifier has failed?
Measure the voltage at the battery with the engine running. A healthy system on this part settles at around 14.5 V. A reading that stays at battery level, or one that climbs well above 15 V and boils the battery, points at the regulator rectifier. Repeatedly flat batteries and dimming lights are the usual symptoms.
How much charging output can this unit handle?
It is rated for a maximum charging current of 25 A, equivalent to 300 W, with an open circuit voltage below 15 V and an operating temperature range of -20 C to 85 C.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
