MOSFET Regulator RMS021-106036 for Honda TRX, Suzuki LTR and Yamaha YFM

Honda TRX 250 and 400, Suzuki LTR 450, Yamaha YFM 350, 450, 600 and 660, 1997-2024

This is an advanced MOSFET-type voltage rectifier regulator, part number RMS021-106036, built as a direct replacement for the OEM diode-style unit on the Honda TRX 250 and TRX 400, the Suzuki LTR 450 and the Yamaha YFM 350, 450, 600 and 660, across the 1997 to 2024 model years. Installation is plug-and-play and the unit brings improved heat management over the original part.

MOSFET regulation is the upgrade here. The unit operates at lower temperatures than a traditional regulator, reduces the load on the stator - which improves fuel efficiency and frees up engine power - and delivers steadier, smoother power to the battery, extending both battery lifespan and cold-cranking capacity. It also has an overheat protection mechanism, so instead of allowing the unit to burn out it disables itself until it has cooled. The package includes an additional connector for the main harness side, which matters because the original connectors are so commonly melted or corroded. The regulator uses a single plug with six pins in a body 25 mm wide, 79 mm long and 83 mm high, with 60 mm between the mounting hole centres. It provides a minimum charging voltage of 14.5 V plus or minus 0.5 V, a maximum charging current of 50 A / 500 W, open circuit voltage below 15 V and an operating range of -20 C to 85 C. Before fitting, verify the AC output of the stator, replace any burned or corroded connectors, repair melted wiring and apply high-temperature dielectric grease to every connection. Professional installation is recommended to prevent malfunction.