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Shindengen is the Japanese manufacturer. It is indeed a Mosfet (though still a shunt type) The more modern transistors run much much cooler....the old EX500 regulators went UNCHANGED from late 80's design to when they were discontinued in '06.,,,and as they aged, they frequently cooked themselves from inside/out.
the Shindengen Mosfet I used back then was their model FH010, it was OEM on the ZX10 from 04 through 06 or 07? .....nowadays there are later model FH020. I still use FH010 in EX500 applications....incredibly reliable, affordable and available. Can be used on EX250 and 500, though some wiring trickery must occur. I custom build an RR adaptor harness which plugs in to the bikes existing harness....that is what is pictured above. I think member Ghostt is running an FH010 on his 250.
Not sure what RR is supplied on the 300, though.
The latest and greatest is now the "SERIES" type regulator. Google that, not a shunt and much more $$$.
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