I purchased a boat last year and was told the motor was a 85 or 86 wasn't sure. My question is can the year model be gotten if you have the SN? The SN is 0B140755 , The other question I have is what other year model motors can parts be interchanged with on this motor? and does it have to be a 25 hp? The reason I am curious is one of my cylinders is scared and I would like to buy another used motor that I can excange parts with. Any help would be greatly appreciated. Thanks.