As I understand it Dark and base model have the same engine 2003 base and S models - same engine 2004 S model - revised cam profiling +5BHP all R model engines are a world away from the above the ECUs are all the same and only have a different map depending on engine fitted. My R has a 1098 ECU in it which has been reflashed as I wanted to keep my original ECUs original
Not sure what you mean but the method of moving the tank back and forward is the same on my 04 749R as it was on my 04 base model mono. I don’t understand the bit that you mean and how that works
The tank and seat are adjustable on all Monoposto models. On 749 base, Dark and S the tank mount is welded on the frame, on R it's bolted on and can be removed. Doesn't have anything to do with the adjustability.