For that you will have to contact joeljoe on another forum. I said this because I have ridden both bikes back to back. The F2 had lesser kilometers on odo compared to classic fiero and the punch was absent from the F2's engine and it was very obvious.and whats the difference between Fiero's and Fiero F2's engine?
If you compare the performace results when F2 was launched, it was the weakest performing 150cc out there with 4 gears priced almost on par with infinitely better CBZ.
I am not saying its a bad bike... what I am saying is that it was overpriced and under-equipped until TVS learned the lesson and came up with Apache and now the RTR.