This is a brand new starter relay solenoid switch for the Honda TRX 300 EX Sportrax, supplied as a direct replacement to your original unit. The starter relay sits between the battery and the starter motor and does the heavy work in the starting circuit. Pressing the start button passes a small current through the relay coil; that coil pulls a set of contacts together and lets the full battery current flow to the starter. Because those contacts carry the entire starting load, they arc slightly on every cycle and gradually pit and corrode, which is why a sport quad that has done a few seasons of hard use so often develops a starting fault that traces back to the relay rather than the battery.
The quality of this unit exceeds the OEM equipment, and all products shipped are tested before dispatch. It matches the original in every fitting dimension - 48 mm high, 33 mm wide, with a two-wire trigger lead, two heavy-duty terminals and a single plug - so it drops into the factory mounting position and connects to the existing loom and battery cable with no cutting, splicing or adapters required. Fitting is a straightforward job that takes only basic hand tools.
Key Features
- Brand new aftermarket starter relay solenoid switch
- Quality exceeds the OEM equipment it replaces
- All products shipped are tested
- Direct replacement to your original unit
- Two-wire trigger lead with two heavy-duty terminals
- Single plug matching the factory connector
- 48 mm high, 33 mm wide compact body
- Cross references Honda 35850-HM3-A60
Technical Specs
| Specification |
Detail |
| Part code |
RMS090-104746 |
| Component type |
Starter relay solenoid switch |
| Height |
48 mm |
| Width |
33 mm |
| Wires length |
49 mm |
| Number of wires |
2 |
| Number of terminals |
2 |
| Number of plugs |
1 |
| Installation |
Direct replacement |
Vehicle Fitment Guide
| Make & Model |
Years |
| Honda TRX 300 EX Sportrax |
2007-2009 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 35850-HM3-A60 |
Honda |
Frequently Asked Questions
Will I need to modify the wiring?
No. This is a direct replacement to your original unit. It uses the same two-wire trigger lead, two terminals and single plug as the Honda part, so it mounts in the factory position and reconnects to the standard loom without cutting or splicing.
What comes in the box?
One brand new starter relay solenoid switch, tested before it is shipped. The battery cable, starter cable, terminal nuts and mounting rubber are transferred across from your old relay.
What are the symptoms of a failed starter relay?
The most common is a single loud click when you press the start button with no engine rotation at all. Rapid repeated clicking, a starter that turns slowly despite a fully charged battery, or starting that works cold but fails once the machine is hot all point the same way. Worn contacts add resistance to the circuit, so voltage that should reach the starter is wasted as heat in the relay - a relay that gets warm after a few attempts is a strong clue.
How do I confirm this is the right relay for my quad?
Check the part number on your original relay against Honda 35850-HM3-A60 listed above. If it matches, this is the correct unit for your 2007-2009 TRX 300 EX Sportrax. If your quad has had a previous non-standard repair, compare the body size and terminal spacing as well.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
