I have a 01 yz426. I bought it as a project, and boy is it one. A valve dropped and hit the piston, thus ruining the piston and head. My queston to the gods of the yz is can I use any other head on this bike, Like a 400-400wr-450-450wr? Oh ya can I use the lighting system off a wr on my yz426f? Thanks for the help.