This is a brand new starter relay solenoid switch for the Yamaha XJ 600 S, sold as the Seca II from 1992 to 1998 and as the XJ600S Diversion from 1992 to 2002. The solenoid is the high-current switch that stands between the battery and the starter motor. Pressing the start button sends a small current through the solenoid coil, the coil pulls a set of heavy contacts closed, and the full cranking current is then free to reach the starter. Because the low-current handlebar switch never has to carry that load, the solenoid is the part that takes the punishment and the part that eventually burns out.
This unit replaces the original solenoid directly. It measures 50 mm long by 50 mm wide by 53 mm high, carries a single terminal with one plug and one 15 mm wire, and matches Yamaha OEM part number 4BP-81940-00-00. The manufacturer states that the quality exceeds the OEM equipment, and every unit is tested before it is shipped. The product photographs are accurate, so if you are unsure which solenoid your bike carries, compare the item shown against your original part before ordering.
Key Features
- Brand new starter relay solenoid switch, not a refurbished unit
- Direct replacement for Yamaha OEM 4BP-81940-00-00
- Single terminal with one plug and one 15 mm wire
- Compact 50 mm x 50 mm x 53 mm body
- Quality stated to exceed the OEM equipment
- Every unit is tested before dispatch
- Covers both the Seca II and Diversion versions of the XJ 600 S
Technical Specs
| Specification |
Detail |
| Part number |
RMS090-106125 |
| Height |
53 mm |
| Length |
50 mm |
| Width |
50 mm |
| Wire length |
15 mm |
| Number of wires |
1 |
| Number of terminals |
1 |
| Number of plugs |
1 |
Vehicle Fitment Guide
| Make & Model |
Years |
| Yamaha XJ 600 S Seca II |
1992-1998 |
| Yamaha XJ600S Diversion |
1992-2002 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 4BP-81940-00-00 |
Yamaha |
Frequently Asked Questions
Is this a direct replacement?
Yes. It is built to replace Yamaha OEM 4BP-81940-00-00 with the same single terminal and plug arrangement, so no modification or rewiring is needed.
What is included?
You receive the starter relay solenoid switch itself, with its single terminal, one plug and a 15 mm wire.
How do I tell whether the old solenoid has failed?
With a known-good, fully charged battery, press the start button. One sharp click with no cranking usually means the internal contacts have burned away and are no longer passing current to the starter. Silence points instead to the trigger side - the button, the clutch or side stand switch, or the solenoid coil itself.
Will it fit both the Seca II and the Diversion?
Yes. The XJ 600 S was sold under both names, and this solenoid covers the Seca II from 1992 to 1998 and the XJ600S Diversion from 1992 to 2002.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
