97 yz250.. no sparkey?

[25097yz]

Hey guys, I just bought this bike for real cheap and it ran the first day I got it, but only after I unhooked the kill switch. It wasn't getting any spark with it hooked up. I went to go riding yesterday and it wouldn't start so I pulled the plug and kicked it over and it has next to no spark, not even enough to jump the gap on the plug. I have tried 3 new plugs so I know it's not that. Some guy said his "stator" wen't on his bike same model same year. He said it was doing similar things. My dad had an it175 that had no spark and it was the cdi box a few years ago. Anyone have and suggestions as to what it is, or how to test/eliminate some of these options. I think the electrical is fairly simple on these bikes so it shouldn't be too tough t fix... well I'm hoping. I also noticed the bike would fall on it's face above mid range and had barley any power. It had tons of bottom end though. Any input it greatly apreciated thanks gang.