New Jet purchase - Need Help

[blackmind]

Hello Friend,
A year ago I bought a model yamaha 1998, totally original, served to learn to ride, but for freestyle is not good, I'm negotiating one for freestyle, the seller said it is very very powerful, but the engine is a 900cc billet . my question is original 750cc has much difference? because it's only 150cc difference

some config...
dupla novi 44mm
dry pipe
tubine 155mm
trim
pump shoe

 

[Quinc]

Yes a well tuned billet 900cc engine will be significantly better then a 701. And may also require more maintenance.