I have an 01 wr426 and i just got a used set of 01 yz cams for it. Is there anything i need to change or be aware of? do i need to resurfuse the cams? also, do i need new cam bearings? what kind of power difference am i going to notice... is there less bottom end and more top? one last thing, will i need to re-jet? as you can tell, i am new to 4 stokes soyour responces are appriciated! thank you guys!!!