Background: I have a 99WR with over 3000 race and dual sport miles on it. Physically, it's in pretty rough shape but runs very good. I also have 2001 YZ426. Objective: I'm looking for advice as to whether it's worth it to rebuild the engine on the WR and restore it from scratch. If yes, what actually NEEDS to be done on the engine. Or are the engine components used to an extent that can't be recovered. Does anyone have experience with this sort of project? I'm willing to spend about $800 - $1000 if I can get it close to new. I'd also like to make it lighter and more responsive like my YZ. Any ideas?