I'm thinking about building a CT90/110 with a Lifan engine. I'm going to buy a frame and build it up from a bare frame. It won't be anything really stock looking, probably more of a rat type bike, for real ADV use. My first question is, are they the same frame? Also, is there any particular years to avoid due to poor construction etc.? What would be the maximum size engine one of these frames could hold? If I think of any other questions, I'll be sure to bug you guys! Thanks!