I just bought a 99 tracker 175 from an older man for 200$. He said it has been sitting for 2yrs. I took it home and rebuilt carb, changed the water pump, spark plugs. It fired right up. I had the ears on the motor and no water came out of the pee hole and I can hear knocking in the block. So I did a compression test and 120 on both cylinders. Then I let it run a minute and it was hot as afire cracker and a little water was building up in the bottom of the cowling. Si is it my worst nightmare or a simple fix? Any thoughts greatly appreciated.