For Performance wise you could shave the stock flywhee. It will make it rev up or come on the pipe faster, but it will also fall off the pipe faster if you bog it in a corner.
I run a Ricky Stator flywheel. I dont know what the weight is compaird to a stock flywheel but it has stronger magnets to help the head lights be brighter at lower RPM's. I have herd of 2 people that had the rivits shear off of them. Ricky stator took care of them though. New flywheel, stator, and timing plate. I havent had any problems.
josh