So I know the engine (gsxr1100) will fit in my frame (1992 gsxr750), but I was wondering if this is doable legally? If the engine is the same capacity, I know it just costs like $25 to update the engine number with the rta, but since the model of my bike is a "gsxr750", would there be some clash? Or do I still keep it registered as a gsxr750, but update the displacement field with 1100? I'm guessing I would need to inform my insurance too? However, since the engines look almost identical from the outside - do I just tell them the new engine number and be done with it? That would seem kind of illegal no?