I just upgraded from a 01 426 to a 04 450 . I missed out on all the magiazine hop up articals from 04 . so what is a good motocross set up . the bike came from a fast trail rider and has all the offroad goodies on it. engine wise it has a fuel screw,and i will get a quick shot cover. Im a 190 lb 40 year old intermediat vet class rider . I am intrested in lowering my rad like the 06 . do i have to replace the right rad like it looks . expensive ? and what about springs is the stock rate ok ? anything else ? this is the first time riding this computer thing . is ther really anyone out there? well that is alll about summer right now im off to ride my moutian sled into the last frontier.