the flywheel is pressed in there, so if you can get that out, do it. (it'll save you money) I burned up my bearing a while back, and to have my flywheels taken apart, replace the bearing, put back together and balanced, it was gonna cost more than for me to just go buy a wiseco hot rod crank assembly and just throw it in.
you can't replace that bearing yourself, unless you know how to split the flywheels, balance and true them upon re-assembly.
I just looked it up on pitposse.com and an entire crank assembly for your bike is about 170 bucks w/o shiping. Assuming you are okay with tearing your motor completely apart.
Good Luck!