Starter Relay Solenoid - RMSTATOR RM09001
Yamaha Big Bear, Breeze, Kodiak, Timberwolf, VK and Warrior | Aprilia RSV 1000 and Dorsoduro | 1976-2016
The starter relay solenoid is the heavy-duty switch that stands between your battery and your starter motor. When you press the start button, a small current from the handlebar switch energises the coil inside the solenoid, which in turn closes a set of high-current contacts and lets the full battery current reach the starter. Because it carries the heaviest electrical load on the machine, the solenoid is one of the most common causes of a bike or quad that clicks but will not turn over.
This is RMSTATOR part RM09001, a brand new starter relay solenoid switch supplied as a direct replacement for the original unit. RMSTATOR state that the quality exceeds the OEM equipment and that all products shipped are tested before they leave the factory. It is a two-terminal, two-wire design with a single plug and a compact 43 mm x 46 mm x 39 mm body, so it drops into the original mounting position without modification.
Key Features
- Brand new unit - not remanufactured and not a repaired core
- Built as a direct replacement for the original solenoid
- Quality exceeds the OEM equipment, according to RMSTATOR
- Every unit is tested before it is shipped
- Two terminals, two wires and a single plug
- Compact 43 mm x 46 mm x 39 mm body
- Covers a wide range of Yamaha and Aprilia applications
Technical Specs
| Specification |
Detail |
| Part number |
RM09001 |
| Component |
Starter relay solenoid |
| Height |
39 mm |
| Length |
43 mm |
| Width |
46 mm |
| Number of terminals |
2 |
| Number of wires |
2 |
| Number of plugs |
1 |
| Condition |
New, tested before shipment |
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 |
| Aprilia RSV 1000 |
1976-2016 |
| Aprilia Dorsoduro |
1976-2016 |
| Yamaha Big Bear |
1976-2016 |
| Yamaha Breeze |
1976-2016 |
| Yamaha Kodiak |
1976-2016 |
| Yamaha Timberwolf |
1976-2016 |
| Yamaha VK |
1976-2016 |
| Yamaha Warrior |
1976-2016 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 4KD-81940-00-00 |
Yamaha |
| 3AY-81940-00-00 |
Yamaha |
| 4KB-81940-00-00 |
Yamaha |
| 4KB-81940-01-00 |
Yamaha |
| 22U-81940-10-00 |
Yamaha |
| 22U-81940-00-00 |
Yamaha |
| 25G-81940-00-00 |
Yamaha |
| 3H5-81940-00-00 |
Yamaha |
| 1J7-81940-10-00 |
Yamaha |
| 1J7-81940-60-00 |
Yamaha |
| 22J-81940-00-00 |
Yamaha |
| 50W-81940-10-00 |
Yamaha |
| AP8124636 |
Aprilia |
| AP8112927 |
Aprilia |
| AP81129275 |
Aprilia |
| 35850-HA8-000 |
OEM cross reference |
| 35850-HA8-681 |
OEM cross reference |
| 35850-VM3-000 |
OEM cross reference |
| 35850-VM3-010 |
OEM cross reference |
Frequently Asked Questions
Does this solenoid need any modification to fit?
No. RM09001 is built as a direct replacement for the original unit, with the same two terminals, two wires and single plug, so it mounts and connects in the original position.
What is included?
One brand new starter relay solenoid switch, tested before shipment. No additional components are listed by the manufacturer for this part number.
How do I know my old solenoid has failed?
The classic symptom is a single loud click, or rapid clicking, when you press the start button while the lights and dash still work. A solenoid whose contacts have burned may also let the starter turn slowly, or work only when the machine is cold. Check the battery and its cables first, because a flat battery produces the same click.
How do I confirm this is the right part for my machine?
Compare the OEM number stamped or printed on your original solenoid with the cross reference table above, and check the 43 mm x 46 mm x 39 mm body size and the two-terminal layout against the unit you are removing. Disconnect the battery before removing the old solenoid.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
