I just got this boat for free. Its in really nice shape and I'm anxious to have some fun but I'm new to and kinda ignorant about boats. From what I can tell, it a 1963(?) MFG with a 50 hp motor serial #1677059. I got the little muffs on and fired up the boat. Water was coming out of the center of the prop but then it seemed to stop and the (lower unit?) seemed like it got warm pretty quick after only a couple of minutes. So I guess my question is....Is the motor water cooled or just the lower unit? The little intake grates on the side where the muffs cover seem to be clear but with experiance with jet skis I know the motor could be plugged with crap. Although the motor doesn't appear to be water cooled. Unless the lines to it are VERY small. I've searched for diagrams with no luck. and the guys at the local marinas don't seem to want to help with something this old. The boat's really cool and the motor runs REALLY good but I don't want to take it out on the water before I know everything is working properly. Thanks for any help. Jeff 