YamahaUK Posted August 21, 2019 Share Posted August 21, 2019 1980 xs250se low miles as it has been sitting. 13.6v at 4000rpm, 12.9v at 4000rpm with the lights on. Changed the reg/rec to single unit from the 2 solid state items (xs750/850 item). 4ohm resistance between the white wires, 0ohm between brown and green. I am not sure how these generate power, but is the rotor supposed to be a permenant magnet, or is it charged by the inner stator? (brown/green wires). anything else I can check before I go nuts with a sledge hammer? 1 Link to comment Share on other sites More sharing options...
jimmy Posted August 22, 2019 Share Posted August 22, 2019 Sledge Hammers are your friends, oh and Fire, they love fire 1 Link to comment Share on other sites More sharing options...
blackhat250 Posted August 23, 2019 Share Posted August 23, 2019 Haa" jim has had this experience . is it like the RD250, where the rotor is inside the stator, with brushes on the slip rings,, if so the brown wire needs 12volt , to magnatize rotor,, 1 Link to comment Share on other sites More sharing options...
YamahaUK Posted August 26, 2019 Author Share Posted August 26, 2019 no, it's the later type with 2 sets of static windings and a rotor in between Link to comment Share on other sites More sharing options...
Moderator drewpy Posted August 27, 2019 Moderator Share Posted August 27, 2019 Do a search , as it’s been discussed loads of times. 400 are the same Link to comment Share on other sites More sharing options...
YamahaUK Posted September 10, 2019 Author Share Posted September 10, 2019 sorted. Duff rectifier. Thw cheap chinese replacement was new but also duff. I replaced the stock rectifier with with a regulator / rectifier from a late model vfr800 honda and it works fine now. I had to modify the mounting to fit the new reg/rec in the same place. Link to comment Share on other sites More sharing options...
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