I recently purchased an 05 yz450f and have been riding a few times on it. Yesterday my buddies and I went on an all afternoon ride. My buddy was riding it to test it out and when he came back to talk to me there were a couple drops of antifreeze on the floor under him and a little on the edge of the case by the outer case seal on the right side. We didnt think it could be overheating becuase he was doing highspeed runs down the road. After letting it cool a bit I was riding it for a bit and when I parked it there was decent drip rate of coolant coming from the water pump area. I immediatly rode it to the shed and parked it to prevent any further possible damage. My question is what could be happening to cause this coolant leak. Thanks much for any help and sorry for the long post.