This is a brand new starter relay solenoid switch built as a direct replacement for the original unit fitted to the Yamaha Grizzly YFM 600 from 1999 to 2001. The starter relay is the heavy duty switch that stands between the battery and the starter motor. Pressing the start button sends a small trigger current through the relay coil, which closes a much larger set of contacts and lets the full cranking current pass to the starter. Those contacts take a hammering every time the machine is started, so over the years they pit, burn and eventually stop making a reliable connection.
The quality of this replacement exceeds the original equipment and every unit is tested before it is shipped. It is a two terminal, two wire solenoid with a single plug for the trigger circuit and a 150 mm wire length, measuring 47 mm high, 43 mm long and 32 mm wide so it sits in the standard location on the quad. Fitting is a simple swap: disconnect the battery first, move the heavy battery and starter cables across to the new relay, plug in the trigger connector and refit the unit to the original mount. No modification to the wiring loom or the frame is needed.
Key Features
- Direct replacement for the original Yamaha starter relay solenoid
- Quality exceeding the original equipment specification
- Two terminals, two wires and a single trigger plug
- 150 mm wire length
- Compact 47 x 43 x 32 mm body for the standard mounting position
- Every unit tested before dispatch
- Cross references three Yamaha 5GT-81940 part numbers
Technical Specs
| Specification |
Detail |
| Part Number |
RMS090-106327 |
| Component |
Starter relay solenoid switch |
| Height |
47 mm |
| Length |
43 mm |
| Width |
32 mm |
| Wire Length |
150 mm |
| Number of Wires |
2 |
| Number of Terminals |
2 |
| Number of Plugs |
1 |
Vehicle Fitment Guide
| Make & Model |
Years |
| Yamaha Grizzly YFM 600 |
1999-2001 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 5GT-81940-00-00 |
Yamaha |
| 5GT-81940-10-00 |
Yamaha |
| 5GT-81940-11-00 |
Yamaha |
Frequently Asked Questions
Will this relay fit without modification?
Yes. It is a direct replacement for the original Yamaha unit on the Grizzly YFM 600 built between 1999 and 2001. The heavy cables and the trigger plug transfer straight across and the relay refits to the standard mounting position, so no cutting or splicing is involved. If you want to confirm before ordering, compare the number moulded on your existing relay with the cross reference table above.
What is included?
One starter relay solenoid switch with two terminals, two wires of 150 mm and a single trigger plug. Cables, terminals, fuses and mounting rubbers are not supplied - reuse the ones already on the machine.
How do I tell whether my old starter relay has failed?
The usual symptom is a single sharp click from the relay when you thumb the starter while the engine does not turn over, with the headlights and dash staying bright. Starting that works one day and not the next, cranking that returns if you tap the relay body, or a relay that sticks closed and keeps the starter engaged all indicate the same fault. If the battery is charged and the cable ends are clean and tight, the relay is the most likely cause.
Which cable goes where on a two terminal relay?
One large terminal takes the positive cable from the battery and the other takes the cable that feeds the starter motor. The two smaller wires with the plug carry the low current trigger signal from the start button circuit. Photograph the original before removing it, disconnect the battery first, and keep the heavy terminals well away from the frame while you work.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
