This is a brand new aftermarket voltage regulator rectifier built as a direct replacement for the original unit fitted to the Honda CB 650 family. It is a plug-and-play, direct fit part that uses the same fixing centres and the same two-plug connector arrangement as the factory component, so no assembly is required and the standard wiring loom does not need to be cut or modified in any way. The unit rectifies the alternating current produced by the stator into direct current for the battery and regulates the charging voltage so that the battery, the lighting and the ignition circuit are protected from over-voltage.
Higher grade electric components are used throughout and the quality of this unit exceeds the OEM equipment it replaces. Every product shipped is tested before dispatch. The regulator holds a minimum charging voltage of 14.5 V +/- 0.5 V, handles a maximum charging current of 50 A / 500 W, keeps open circuit voltage below 15 V and is rated for use from -20 C to 85 C. It cross-references to Honda part numbers 31600-426-000 and 31600-460-731.
Key Features
- Direct replacement for Honda 31600-426-000 and 31600-460-731
- Plug-and-play, direct fit - no assembly required
- Higher grade of electric components, quality exceeds the OEM equipment
- All products shipped are tested
- Two plugs, eight pins and eight wires as per the original
- 3-pin plug wire length 185 mm, 5-pin plug wire length 225 mm
- Fixing hole centres of 69 mm for a bolt-on fit
- Rated at 50 A / 500 W maximum charging current
Technical Specs
| Specification |
Detail |
| Width |
82 mm |
| Length |
94 mm |
| Height |
28 mm |
| 3-pin plug wire length |
185 mm |
| 5-pin plug wire length |
225 mm |
| Fixing holes, centre to centre |
69 mm |
| Number of plugs |
2 |
| Number of pins |
8 |
| Number of wires |
8 |
| Minimum charging voltage |
14.5 V +/- 0.5 V |
| Maximum charging current |
50 A / 500 W |
| Open circuit voltage |
Less than 15 V |
| Operating temperature |
-20 C to 85 C |
| Part number |
RMS020-103097 |
Vehicle Fitment Guide
Years shown are the overall coverage span for this part. Please confirm against the OEM part number on your original unit before ordering.
| Make & Model |
Years |
| Honda CB 650 |
1979-1982 |
| Honda CB650C Custom |
1979-1982 |
| Honda CB650SC Nighthawk |
1979-1982 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 31600-426-000 |
Honda |
| 31600-460-731 |
Honda |
Frequently Asked Questions
Does this need any modification to fit?
No. It is a direct, plug-and-play replacement with 69 mm fixing hole centres and the original two-plug, eight-pin, eight-wire arrangement, so it bolts into the standard mounting position and plugs into the existing loom without cutting or splicing.
How do I confirm this is the correct part?
Check the number on your original regulator rectifier. If it reads 31600-426-000 or 31600-460-731, this is the correct replacement. Comparing the 82 x 94 x 28 mm body and the 69 mm hole centres against your old unit is a useful second check.
How can I tell my original unit has failed?
Typical symptoms are a battery that goes flat repeatedly, dim or flickering headlights, or a voltage at the battery that does not rise towards 14.5 V once the engine is running. Voltage that climbs above 15 V is the other failure mode, since a working unit holds open circuit voltage below 15 V.
Are the two plugs different sizes?
Yes. The unit has one 3-pin plug on a 185 mm lead and one 5-pin plug on a 225 mm lead, matching the original CB 650 wiring layout of eight pins across two connectors.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
