With little experience, I'd take them, clean everything, and sell the parts.
Unless you REALLY want to build a basket case, it's probably not worth it.
You can expect to spend in a perfect world:
- ~$200 new tires/tubes
- ~$50 new battery
- ~$25 carb rebuild kits
- ~$10 spark plugs
- ~$30 oil change
In reality:
- ~$200 Tires
- ~$50 battery
+$50-$100 in misc wiring parts to replace the rotted/broken/burned/missing connectors and the fuse block that is 100% guaranteed to be f'd up.
+$50-$200 on used or new regulator/rectifier/stator/coil/ trying to chase down charging problems.
- ~$25 carb rebuild kits
+$50 for the torn/rotted diaphragms
+$20 for an o-ring kit (if you can find one)
+~$35 for the cracked/rotted carb boots
- ~$50 to refurbish, or buy a used seat to replace the cracked up original.
- ~$30 oil change
+$15 for a new oil filter bolt to replace the stripped out one on the bike
And this is assuming the engine/trans are in working order, and the bike is complete. There are hundreds of dollars more to be spent depending on what else needs to be done.
I'm not trying to discourage you in any way. I've got more than I ever intended invested in my wifes xs400. I'll NEVER get back what I've put into it, but I still enjoy it. I know what's been done, what needs to be done, and what I want to do next. I just want to let you know what you can expect to run into, and how much money it can cost in the blink of an eye. Free bikes are rarely cheap.