Thanks for your suggestion, we have the options you mentioned, but Peace sports didn't ask for these options.
We have inverted front forks, 17' on-road tire (actually we are using front 19',rear 17' on road tires).
The engine we are using is 229cc OHV engine with balance shaft, we can also use OHC engine on this model.
Yes, we know the proformance will be better, but the cost will be much higher, we have to consider these factors.