One day I was out riding and it just quit. I messed around with it and I found out that I did not have any spark at all. So I bought a new big gun cdi for it. Well, that fixed the spark problem, but now that I have spark it still don't start. Any ideas? Could it be the rectifier?

 

yup id check that next

 

Replace the plugs while you are at it. Even if you have spark.