2007 charging issues

Just got a 2007 yfz450, pretty sure stator needs to be replaced, did a resistance test on it but resistance was good, around .5 to .7 ohms on both wires on the white connector, did a ac voltage test on white connector with the bike running and only got 2.5 ac volts coming out of it, is that a obvious reason to replace the stator, also has any tried the eBay stators that are around $40, don’t want to spend the $200 for one from like Motorsport but will if I have too