Modern Buddy

Ok so I'll admit I haven't any Idea, I found a 1984 Honda Aero 125 for sale. It's in pretty rough shape cosmeticly (sp) but it seems to run fine, but there again is my problem, I really know nothing about engines and/or fixing them. There is also an issue with a sticking front break. The guy is asking $600, I thought I'd offer him $400, since he said "Make an offer" Whay do you guys think?

Got a mechanic nearby who can look at it and can fix it if you buy it?

The Aero's a funky little scoot, but you may need to hit up a Honda forum for info on it. $400 is pretty cheap, but how much are you willing to invest overall to get it in tip-top shape?

Does this one have the solid horizontal headset?