I've bored mine to 1170cc and it runs really well between 3000 and 5000revs. Can go any further than that really as the engine is effectively brand new. Under that it's a bit rough. According to the plugs it's running really weak and the engine is running hotter than I would like 
As there is no form of mixture control with the DFi system I don't really know what to do now. Today I fixed a fuel pressure gauge to the system and that showed it to be about right (34psi at tick over). The bike looks good enough, and rides lovely, but need to get the fuelling better.
