I bought a non-running KTM '06 200XC a few weeks ago and I've been tearing into it. I don't know anything about its maintenance history or anything. When I drained the gearbox oil the goo that came out wasn't confidence inspiring. There wasn't much oil in there, what was there was very dark, and one or two small metal chunks came out. There was also a lot of swarf on the magnetic drain plug. I have the cases split now and the gears don't look so great. At a quick glance everything looks fine but when you look closely lot of them have small chips and there is some galling on various teeth. Below is a picture that's representative of the whole gearbox. It would be big bucks to replace all the gears with new ones from KTM and I really don't have that in the budget. Some searching around online didn't turn up any used gearboxes. I'm hoping that I can get away with just cleaning everything up really well, putting it back together, using high quality gearbox oil, and changing it often. The gears still have their overall integrity, after all. What do you guys think? Can I get a couple more seasons out of this gearbox or is it a grenade that will be ready to go off? I'd also be interested in a good, used gearbox that would fit this bike if anyone had one. Either an XC or XC-W would be alright with me. Thanks.