Yamaha Grizzly YFM450 Starter Solenoid Relay 4SV-81940-12-00
Replacement starter solenoid / starter relay for Yamaha Grizzly YFM450 applications using the compatible Yamaha two-fuse relay pattern. The relay acts as the high-current electrical switch between the battery and starter motor when the starter button is pressed.
Components Identified From the Product Photos
- Black moulded starter-solenoid / relay body
- Two heavy-current brass threaded terminal studs for battery and starter-motor cables
- Brass terminal nuts for the high-current cable connections
- Two blade-fuse positions under translucent protective fuse covers
- Low-current control connector / terminal section between the main connections
- Insulated base/body designed to locate in the motorcycle or ATV relay mounting area
Key Specification
- Electrical system: 12V
- Relay type: High-current starter solenoid / electromagnetic starter switch
- Fuse arrangement: Twin 30A fuse positions on the common 4SV/4YR-pattern equivalent family
- Main connections: Two threaded high-current studs
- Condition: New aftermarket replacement
A comparable 4SV/4YR-family replacement is specified at 12V and 150A with 30A fuses. This is cross-reference specification data for the equivalent relay family rather than an individual factory test certificate for the supplied unbranded item.
Yamaha OE & Aftermarket Cross-References
- Yamaha 4SV-81940-12-00
- Yamaha 4SV-81940-00-00
- Yamaha 4SV-81940-10-00
- Yamaha 4SV-81940-11-00
- Yamaha 4XE-81940-12-00
- RM Stator / Coynes reference 09007RM
- Aftermarket SMU6185 / RC19-015 family
Primary reference family for this listing: 4SV-81940-12-00.
The supplied product is unbranded aftermarket, not a genuine Yamaha, RM Stator, NICHE, Wemoto or DB Electrical relay. All OE and manufacturer numbers are supplied only to help identify the correct interchange family.
Listed Application
Yamaha Grizzly YFM450
Genuine/aftermarket catalogues list 4SV-81940-12-00 for Grizzly YFM450 applications, including 2007-2014 variants.
Compatibility Check Before Ordering
- Compare the complete relay shape with the product photographs
- Confirm the relay has the same two heavy-current threaded studs and terminal orientation
- Compare the fuse arrangement and fuse-cover positions
- Compare the low-current control connector, pin arrangement and keying
- Check how the original relay locates in its rubber holder or mounting area
- Compare the Yamaha OE number on the original relay with the cross-reference family above where possible
Yamaha used several starter-relay part-number suffixes across different years and markets. Matching the original part number and physical connector/fuse layout is more reliable than ordering by model name alone.
Electrical Safety & Installation
Disconnect the battery before replacing a starter relay. Transfer the battery and starter-motor cables one at a time so they remain on the correct terminals, tighten the terminal nuts securely without over-stressing the relay body, and confirm the fuse rating matches the motorcycle or ATV specification. A faulty battery, starter motor, cable or charging system can damage a replacement relay or cause repeated fuse failure.
What Is Included
One starter solenoid / relay assembly with terminal nuts, fuse positions and covers as shown in the product photographs. Battery cables, starter motor, mounting rubber, wiring loom and additional vehicle-side hardware are not included unless visibly shown.
Delivery & Returns
- Free UK delivery with an estimated 2–3 working-day service
- 30-day returns, subject to the item being returned in its original condition