Not the brightest idea in my opinion. Like the old saying goes...its not if you crash, but when you crash. Why tear up that beautiful engine on something that is going to take a lot of abuse. But hey, its your money....do what you want with it....you earned it.

Having just bought my first 4s (ys 63....just love it....) I can say that a 4s is a different animal. I would not say its easier to tune that a 2s, its just different.

I also believe that you buy a motor for a purpose. 4s are known for their stump pulling power, steady power band, and cool sound (supposedly good for 3D flying). 2s are know for being cheaper, easier to repair, and high rpm's for speed (supposedly good for speed).

It boils down to do what you want. I always do.....