Hi:<br />I have recently purchased a second hand 30 HP Mariner motor. It has overheated and seized twice since I have bought it. I brought it into the shop after the first time but the mechanic could not find anything wrong. They suggested that it was the pre-mix that I had used. So I mixed my own gas a bit richer then the suggested 50:1. It ran well a few times out then overheated a seized again. Another dealer who did not have the proper equipment to fix mariners suggested that there could be a number of problems. I don't wqant to take the motor out until I get this problem sorted out. Does anyone know a good manual that I can study or any suggestions? I am not sure what year the motor was made. It's serial number is 689 S 024-365<br />Thanks
