I have an old Evinrude Sportster 2 cylinder with no number plates. I was told to look for the quarter size "plug" with a number on it. I found what I think is this plug....has the number J2435836 on it. I need year, availabilty of manual and parts, and whether it is worth the bother to repair...looks like power head has had a rebuild...a few small parts missing. Thanks.