Aftermarket stators for ttrs are notoriously useless.
Don't forget to have the multimeter on AC to test stator voltage.
Did the bike run with the old stator? (Ignoring the oil leak for a moment) And what was the reason for the new regulator/rectifier?
send your old stator to west country windings for checking if its faulty they will rewind it for you ive used them many times over the years very friendly & cost is ok they will give you honest opinion / quote john
Good tip from John for West Country Windings. They should be able to repair damage without doing anything unnecessary like rewinding. If the grommet and wires on your replacement stator look the same as the originals you should be able to swap them yourself though.
Didn't mean to teach granny to suck eggs regarding AC setting on multimeter. Sometimes they give odd readings if misdialled so I wanted to doublecheck despite your first post asking for AC reading.
Not sure what it is with the aftermarket jobs, the windings themselves or the signal pickup, but there have been a few forum members over the years falling victim to this (and, incidentally, Chinese made starter sprag clutches)
Good luck. At least you are in a position where you have a running bike!