I have one also. Im 200lbs and about 5 10". I can ride it fairly well. That style 125 is a lot peppier then the older ones. That one is deffenatly worth 450 as the plastic looks to be in good shape. That body style is harder to find good plastic for. Also some of the motor parts are hard to find also as the motor was only made 2-3 years.
I love riding mine mainly because its a 125 and no one believes it. I put a set of 200x rear hubs and rims on mine and some aluminum front rims. This is what mine looks like after I fixed it up. $180: for the atv $300: For rims, plastics, maintance and tires

1985 Auto X lots of upgrades
1982 Honda 185s 3inch wheel spacers, bassani exhaust
2001 400ex
1983 110