There have been some minor changes from the start to finish. But, looks wise '90-'04 is all the same except the forks and rear suspension valving. Engine/Frame/Subframe/Wheels from '89-'04 is all the same. Forks were upgraded from The forks were upgraded from conventional forks to upside downwards in '90 and then upgraded again in '91 to 43mm. I believe the '94 went again to a new size and so on. Mainly suspension upgrades. Nothing at all major.