I have used the drawing for the correct dimensions of the motorbike.

Print settings:
Default Cura 13.03:
- All parts            --> support = exterior only
                           --> wall thickness = 0.8
                           --> infill overlap = 45%
                           --> material amount = 25%
Exception:
- MotorFront part --> add raft = true
- MotorBack part --> add raft = true
- ShockAbsorber --> support = everywhere