I will take a look at a CRF150F this weekend, but if you could provide me some info or any tips it will be very appreciated...
Bikes I'm looking at :
#1 CRF150F-2003, regular maintenance have been made, but need a front tire (how much for that?). Owner = 18 years old boy and he has used it mainly to go to work
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#2 CRF150F-2005, not sure if the regular maintenance have been done, but I know the chain is rusty (do I need a new one? if so how much?). Owner = 25 years old girl, bought new 3 years ago, ran it the first summer but only 4-5 times last summer and 2 times this summer
picture:

Each of them are asking the same price, about $2000 so I think those are really good deal (is it true?)
What should I ask to the owners?
I'll try only one of them (they are far from my place, so I have to deceide which one I want more...), any test I should do?
Should I take the bike for an inspection by a pro? (how much will it cost)
Any other advice?
Thanks a lot guys !!