A brand new aftermarket voltage regulator rectifier for the four-stroke YZ F motocross models, supplied as a direct replacement for Yamaha part 1SL-81960-00-00. Installation is plug-and-play with no assembly required. The unit uses higher grade electrical components, the quality exceeds the OEM equipment, and all products shipped are tested.
This is a slim regulator, just 19 mm high across a 90 mm by 48 mm footprint, with the two fixation holes 75 mm apart centre to centre. Two plugs carry four wires on short 40 mm tails. An additional connector for the main harness side is included, because the original connectors frequently melt, corrode or fail and are a major cause of recurring electrical problems on hard-used race machines.
Key Features
- Direct replacement for Yamaha OEM 1SL-81960-00-00
- Opposite connector, main harness side, supplied in the box
- Slim 19 mm profile on a 90 x 48 mm footprint
- 75 mm centre-to-centre fixation holes for a bolt-on fit
- Higher grade electrical components, quality exceeding OEM equipment
- Plug-and-play, no assembly required, every unit tested before shipping
Technical Specs
| Specification |
Detail |
| Width |
48 mm |
| Length |
90 mm |
| Height |
19 mm |
| Wire length |
40 mm |
| Fixation holes, centre to centre |
75 mm |
| Number of plugs |
2 |
| Number of pins |
4 |
| Number of wires |
4 |
| Minimum charging voltage |
14.5 V +/- 0.5 V |
| Maximum charging current |
50 A / 500 W |
| Open circuit voltage |
Under 15 V |
| Operating temperature |
-20 C to 85 C |
Vehicle Fitment Guide
| Make & Model |
Years |
| Yamaha YZ 250 F |
2014-2018 |
| Yamaha YZ 450 F |
2014-2019 |
OEM Part Number Cross Reference
Aftermarket replacement. OEM part numbers are listed for reference only.
| Part Number |
Manufacturer / Brand |
| 1SL-81960-00-00 |
Yamaha |
Frequently Asked Questions
Will this fit without modification?
Yes. It is a plug-and-play direct replacement for Yamaha 1SL-81960-00-00, with the same 75 mm centre-to-centre fixation holes and the same two-plug, four-wire layout. No assembly is required.
What is included in the box?
The voltage regulator rectifier unit and the opposite connector for the main harness side, so both halves of the connection can be renewed together.
How do I tell whether my old regulator has failed?
With the engine running, measure across the battery terminals. A working system should reach at least 14.5 V +/- 0.5 V. If the reading stays at resting battery voltage nothing is charging; if it rises well past 15 V the regulator is overcharging. On a motocross bike also inspect the connector pins, as vibration, water and mud accelerate corrosion.
Does the same part cover both the YZ 250 F and the YZ 450 F?
Yes, but the year ranges differ. The YZ 250 F is covered from 2014 to 2018 and the YZ 450 F from 2014 to 2019. Check the number on your existing unit reads 1SL-81960-00-00 before ordering.
Dispatched from the UK · 12-month warranty · Fitment support from our technical team
