Need some help... Was out on the lake running at full throttle and all of a sudden the motor cuts off instantly. Has electric start and I can crank it over but the engine would not start. Get back to shore with the trolling motor. The motor has fuel, and spark but no compression in the top cylinder. Verified it with a compression tester. Any idea of what could have happened? Blown engine? burnt valve? etc... Is there anything I could check by looking at the valve body for a quick diagnosis, is there something I could check to see what possibly could have broken? What would cause compression on the bottom cylinder and 0 compression on the top cylinder? Any help would be appreciated. I just want to get pointed in the direction of repair or replacement. The motor is 12 years old. The motor always started up fine with zero issues, and idled fine, with no other issues except for what just happened. I change the oil yearly and use the boat about twice a month in the summer months. The water pump works fine. Not sure if the motor just blew up or what. Thanks for any help.