If you are talking about the carb bowl over flowing, two things can be wrong. Either the float is stuck/damaged or the gasket around the bowl has dried out and it is running out of there. In any case, remove the bowl and clean the bottom of it inside. There will most certainly be residue from old gas in there you dont need to suck through the jets upon starting it the first time. I would go to the Honda shop and buy a rebuild kit that contains a new gasket and o-rings for the mixture screw etc. It is about $20 and a good investment. Take the bowl off first and inspect the float to see if it is damaged. It will most likely be fine. Put it back together and see if it leaks. If it still does, it may be an adjustment on the tab that pushes the fuel shut off brass stopper into the fuel intake. You will see how it works when you see the inside workings of the float.
In any case, nice pick up! I like the newer parts bike with the larger wheels. You may even want to see if the bigger wheels fit on your rider. They will smooth out the ride a bit.