Re: ceramic paint
Renting a bead/sand blaster would be your best bet if you are going to remove that paint while the engine is on the bike. Any of the solvents/brake clean might effect the finish on your bike frame. The bead blaster is controlled where it goes by you. I believe that Home Depot rents them. Just make sure to cover the intake and any other areas that you dont want the stray beads to go with tape.