To fix it you need to find out why it is overheating and take the appropriate steps to address the issue. Could be that the jetting is off, water flow problem, could be too much timing, the list goes on and on. I am afraid that more information is needed since every bike is set up differently. Another thing that would help is to know exactly where the coolant is coming from. "what looks like the engine" is pretty vague, chief! Out of the head, base gasket, overflow, clutch side, it all points in different directions.
Find out some more details and repost and I am sure somebody can help you out!
SP