A brand new starter relay solenoid switch for Yamaha, supplied as a direct replacement for the original unit. RMSTATOR states that the quality exceeds the OEM equipment and that all products shipped are tested before despatch. Part number RMS090-102558 covers the YZF-R6, the TTR 90, TTR 125 and TTR 230, and the WR 250 and WR 450, across a 2003 to 2026 coverage span, and cross references nine Yamaha part numbers including 5HH-81940-00-00 and 5HH-81940-02-00.
The starter relay solenoid is the high current switch that sits between the battery and the starter motor. Pressing the starter button sends a small current through the relay coil, which pulls a contact closed and allows the full battery current to reach the starter. Because it carries that load on every start, and because it lives in a hot and often wet part of the machine, the contacts burn and the coil windings fail over time. This unit stands 50 mm high, 39 mm long and 46 mm wide, with a 110 mm wire length, one wire, five terminals and a single plug, matching the original layout so the existing loom, cables and mounting are re-used unchanged. RMSTATOR notes that all item pictures are accurate, so if you are in any doubt you should compare the unit shown against your original part before ordering.
Key Features
- Brand new starter relay solenoid switch
- Direct replacement to your original unit
- Quality exceeds the OEM equipment
- All products shipped are tested
- Five terminals and one plug, as per the original
- Cross references nine Yamaha OEM part numbers
- Compact 50 x 39 x 46 mm body with 110 mm wire
Technical Specs
| Specification |
Detail |
| Part number |
RMS090-102558 |
| Type |
Starter relay solenoid switch |
| Height |
50 mm |
| Length |
39 mm |
| Width |
46 mm |
| Wires length |
110 mm |
| Number of wires |
1 |
| Number of terminals |
5 |
| Number of plugs |
1 |
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 |
| Yamaha YZF-R6 |
2003-2026 |
| Yamaha TTR 90 |
2003-2026 |
| Yamaha TTR 125 |
2003-2026 |
| Yamaha TTR 230 |
2003-2026 |
| Yamaha WR 250 |
2003-2026 |
| Yamaha WR 450 |
2003-2026 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 5HH-81940-00-00 |
Yamaha |
| 5HH-81940-01-00 |
Yamaha |
| 5HH-81940-02-00 |
Yamaha |
| 5SL-81940-10-00 |
Yamaha |
| 5SL-81940-11-00 |
Yamaha |
| 5SL-81940-12-00 |
Yamaha |
| 5TJ-81940-10-00 |
Yamaha |
| 5TJ-81940-11-00 |
Yamaha |
| 5TJ-81940-12-00 |
Yamaha |
Frequently Asked Questions
Will this relay fit without modification?
Yes. RMSTATOR supplies it as a direct replacement for the original unit, with the same five terminals and single plug, so the existing loom, cables and mounting are re-used as they are. Check the number moulded into your old relay against the cross reference table above before ordering.
What is included?
The starter relay solenoid switch itself. RMSTATOR does not list any additional hardware under this part number, so keep the original mounting rubber, cables and fasteners from the unit you are removing.
How do I know the old relay has failed?
With a battery known to be good and fully charged, a failed relay usually produces a single loud click, rapid clicking, or complete silence when the starter button is pressed, and the starter motor does not turn. Burnt, discoloured or corroded terminals on the relay body point the same way.
What safety precautions apply when fitting it?
RMSTATOR warns that there is a risk of electric shock. Disconnect the battery before servicing, and ensure the unit is properly installed by a qualified technician to avoid malfunction.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
