I have a 91 250 exc and i just rebuilt the top end. All new seals and everything. Bike runs, but I am leaking coolent into my trans oil. It comes out the breather hose, and it started leaking like this right before it blew up. I am thinking water pump maybe? The coolant doesnt leak until the bike runs, but the amount of fluid getting into the case is startling. What else could my problem be at this point?