I just traded an 01 cr125 an 150 bucks all decked out for a decent 06 yz450f. Had it for 20 minutes riding down the road in 4th just putting and the back wheel locked up. I oulled over and there was coolant pissing out of the weep hole right under the water pump. It is hard now. I only got it started for a half a second after it happened and it shut off again. The kick start still kicks over but it seems harder to kick. Could the water pump have failed and the piston started to warp an it locked up for a few seconds? Or what could it be?