I know there are a few guys here on the board that have a 250R with a CR500 motor in it. I have a couple of questions regarding building one. Frist can you use the stock swingarm for an 85/86 250R and second can you use the stock radiator from it as well or do you need the one for the CR500?? Also, are there any serious mods that must be done to the frame to accomidate the new motor?? I am thinking about doing this as my next project any suggestions would be a big help.