A complete AC to DC charging system conversion for the Honda CRF 450 X, made up of a 90W lighting stator and a matched voltage regulator rectifier. It is designed as a direct replacement, upgrading the standard AC lighting circuit to a switched 12V DC supply that can run lights, a battery and accessories.
The regulator has built-in relays that provide switched 12V DC output, together with an adjustable shut-off delay so the lights turn themselves off automatically after the engine stops. The stator carries its own pickup pulsar coil and measures 72 mm across the outside with a 34 mm interior diameter and 15 mm thickness, with six wires into two plugs. The regulator rectifier body measures 79 mm long by 53.6 mm wide by 22 mm high, with fixing holes 62 mm apart, and delivers a minimum charging voltage of 14.5 V.
Key Features
- 90W AC to DC charging system conversion kit
- Lighting stator and voltage regulator rectifier supplied together
- Direct replacement for the standard unit
- Built-in relays for switched 12V DC output
- Adjustable shut-off delay for automatic light deactivation
- Pickup pulsar coil included on the stator plate
- Connector and rubber grommet included
- Maximum charging current 50 A / 500 W
Technical Specs
| Specification |
Detail |
| Stator interior diameter |
34 mm |
| Stator exterior diameter |
72 mm |
| Stator thickness |
15 mm |
| Wire length (stator to grommet) |
80 mm |
| Wire length (grommet to plug) |
660 mm |
| Pickup coil wire length |
60 mm |
| Number of wires / plugs / pins (stator) |
6 / 2 / 6 |
| Alternator resistance (yellow wires) |
0.4 ohms +/-20% |
| Pickup resistance |
260 ohms +/-20% |
| Source resistance |
20 ohms +/-20% |
| Regulator size (W x L x H) |
53.6 mm x 79 mm x 22 mm |
| Regulator fixing holes |
62 mm centre to centre |
| Regulator wire length |
250 mm |
| Regulator number of wires |
5 |
| Minimum charging voltage |
14.5 V +/- 0.5 V |
| Maximum charging current |
50 A / 500 W |
| Open circuit voltage |
15 V |
| Operating temperature |
-20 to 85 degrees |
| Harness wire length |
145 mm |
| Part number |
RMS900-105941 |
Vehicle Fitment Guide
| Make & Model |
Years |
| Honda CRF 450 X |
2005-2018 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 31120-MEY-672 (stator) |
Honda |
Frequently Asked Questions
Does it fit without modification?
The stator is a direct replacement for the standard CRF 450 X unit on the years listed above. The regulator rectifier is supplied with the kit and mounts using its own fixing holes at 62 mm centres, with 250 mm leads to reach the harness.
What is included?
The 90W lighting stator with its pickup pulsar coil, connector and rubber grommet, plus the matched voltage regulator rectifier unit.
How can I tell my old stator has failed?
Dim or flickering lights, no output to the lighting circuit and a hard-starting or dead ignition are the usual signs. With a multimeter, the alternator winding between the yellow wires should read about 0.4 ohms, the pickup about 260 ohms and the source winding about 20 ohms, each within 20 per cent.
What does the AC to DC conversion actually give me?
It turns the bike's AC lighting output into a regulated 12V DC supply. The regulator has built-in relays for switched 12V DC output and an adjustable shut-off delay that switches the lights off automatically, and it holds a minimum charging voltage of 14.5 V with a maximum of 50 A / 500 W, so a battery and DC accessories can be run from it.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
