This is how I do this.
Look at photos.
What needs to be replaced IMMEDIATELY.
1. it has freestyle bars. this isnt the x-games. replace. grips, lever are bent like a raptor claw.
2. pipe is corroded to hell. replace or sandblast. the silencer is oem, probably shot to hell.
3. both tires
4. all plastics, but save the tank
5. top end, because you have no idea. probably end up splitting the cases (bring a compression tester)
6. probably wheel bearings.
7. fork seals/bushings
8. brake pads
9. all fluids/routine maint shit.
would need to be completely torn down. probably needs swing arm bearings and bushings, (linkage) you'd find that out later.
that's bare minimum for me.
now, i would not be happy unless the frame was powdercoated.
needs 1999 Chapparal Yamaha McGrath graphics.
would take 3-4 weeks, depending on how much eBay you used.
NOW what is it worth? about 600-700 dollarsif you need a top end. however, if you bring a compression tester and it is between 140-160, maybe 900. i'd hope it DOES need a top end, because i'd probably put one in it anyway.
I did this analysis on my KTM. the ad said "make offer". my offer? 200 bucks. he was happy to take it, after I talked to him. but this particular guy seems "proud" of this clapper.
oh, and i'd put an 02 aluminum subframe on it, just because.