One motor is an Evinrude Lark model number 55973a Serial Number c51876 any Idea of the year and size? The other one is 36634 and serial number 13276. again any idea of the year and size? Found a Merc thundebolt 500 but could not make out the model number or serial number due to it still being tipped on boat and stuck in place, It had 5 or 6 blue stripes on the cowel, again any idea as to the year? I know it is a 50 hp. I want to make an offer on all three but I need to get a little better idea of what I am looking at. Further to that is there any interest in trading big motors for small motors?