I have a 2001 campion allane with a 5.7 merc, 250 hp. I ran it once last month, it ran great. This morning I tried starting it and it acted as if it were seized up. I took the plugs out and water drained out of the two rear cylinders. The motor cranked over and blew water out of the cylinders. I cleaned the plugs, replaced them and started the motor. It ran great. Somehow water got in the cylinders last time out, but the boat ran great. How is this water getting in?
