Hey guys new to the forums and wondering if anyone can help me. So a little history recently purchased boat (1984 bayliner trophy with aq 125a motor and 270 outdrive) and am having some issues with motor. Boat needed a lot of work to get her going I changed plugs coil wires everything ignition related and treated carb. Changed the bridge on sea water pump due to crack and changed impeller. All seemed well so I ran her with water before her maiden voyage. Idled fine and water system seems flawless. I decided to open her up a little not crazy just revved engine about half throttle then I noticed excessive smoke from exhaust. Upon further inspection noticed oil pumping into carb. From what ive read I have Blowby and im feeling pretty crappy about the situation. I did find a rebuild kit from ebay however I don't know if I can handle such a project and Marina will be out of question due to monies. My question here is What motors can I swap direct with little modification if I need to? Does this seem like a total rebuild will be necessary like could I be overlooking something stupid? Again I wanna say thanks to all and not a mechanic by any means more of a parts changer.