I'm looking to do ther same with an 03 625 sxc here very shortly as well, but i'm looking to buy used, there is a set about 300 miles from my house right now for $500, but it's just rims and tires, can i rock the stock rotors, forks, chain, sprockets?
I had an RXC that started making bearing noise so I tore it down to part out. Already sold the 17" and dirt wheelsets, but I have most of the bike left. Let me know if you guys need anything. The front brake on these is pretty weak so I recommend doing a bigger caliper and master cylinder. Someone here posted in a thread about caliper adapters. The other big thing to change for supermoto would be the rear spring since the stock one is very soft. I have a stiffer spring that is good for a 180-200 lbs rider that I'm looking to sell. Also have the stock spring and a rear shock that has just been refreshed.