I am Going through my 250ex this winter and boring it is one majorthing on my list what kind of power should i be looking for and will it keep up with a 300ex with some mods but not bored

 

I already have mods like jet kit k and N filter with outerwear so i run an open are box and i have a power core 4 so i will have the air and fuel to back it up also im geting a upgraded CDI so i get the lost RPMs.

Thanx